Convert most of the EngineTestCase.createSource invocations into multi-line String literals.

pkg/analyzer/test/generated/compile_time_error_code_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.compile_time_error_code_test;
 
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:unittest/unittest.dart' as _ut;
 import 'resolver_test.dart';
-import 'test_support.dart';
 import '../reflective_tests.dart';
 
 
 class CompileTimeErrorCodeTest extends ResolverTestCase {
   void fail_compileTimeConstantRaisesException() {
-    Source source = addSource(EngineTestCase.createSource([]));
+    Source source = addSource(r'''
+''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.COMPILE_TIME_CONSTANT_RAISES_EXCEPTION]);
     verify([source]);
   }
 
   void fail_constEvalThrowsException() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class C {",
-        "  const C();",
-        "}",
-        "f() { return const C(); }"]));
+    Source source = addSource(r'''
+class C {
+  const C();
+}
+f() { return const C(); }''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_THROWS_EXCEPTION]);
     verify([source]);
   }
 
   void fail_invalidIdentifierInAsync_async() {
     // TODO(brianwilkerson) Report this error.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() async {",
-        "    int async;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() async {
+    int async;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_IDENTIFIER_IN_ASYNC]);
     verify([source]);
   }
 
   void fail_invalidIdentifierInAsync_await() {
     // TODO(brianwilkerson) Report this error.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() async {",
-        "    int await;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() async {
+    int await;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_IDENTIFIER_IN_ASYNC]);
     verify([source]);
   }
 
   void fail_invalidIdentifierInAsync_yield() {
     // TODO(brianwilkerson) Report this error.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() async {",
-        "    int yield;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() async {
+    int yield;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_IDENTIFIER_IN_ASYNC]);
     verify([source]);
   }
 
   void fail_mixinDeclaresConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A() {}",
-        "}",
-        "class B extends Object mixin A {}"]));
+    Source source = addSource(r'''
+class A {
+  A() {}
+}
+class B extends Object mixin A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_DECLARES_CONSTRUCTOR]);
     verify([source]);
   }
 
   void fail_mixinOfNonClass() {
     // TODO(brianwilkerson) Compare with MIXIN_WITH_NON_CLASS_SUPERCLASS.
-    Source source = addSource(EngineTestCase.createSource(["var A;", "class B extends Object mixin A {}"]));
+    Source source = addSource(r'''
+var A;
+class B extends Object mixin A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_NON_CLASS]);
     verify([source]);
   }
 
   void fail_objectCannotExtendAnotherClass() {
-    Source source = addSource(EngineTestCase.createSource([]));
+    Source source = addSource(r'''
+''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.OBJECT_CANNOT_EXTEND_ANOTHER_CLASS]);
     verify([source]);
   }
 
   void fail_recursiveCompileTimeConstant() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "  final m = const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+  final m = const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_COMPILE_TIME_CONSTANT]);
     verify([source]);
   }
 
   void fail_recursiveCompileTimeConstant_cycle() {
-    Source source = addSource(EngineTestCase.createSource(["const x = y + 1;", "const y = x + 1;"]));
+    Source source = addSource(r'''
+const x = y + 1;
+const y = x + 1;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_COMPILE_TIME_CONSTANT]);
     verify([source]);
   }
 
   void fail_superInitializerInObject() {
-    Source source = addSource(EngineTestCase.createSource([]));
+    Source source = addSource(r'''
+''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_INITIALIZER_IN_OBJECT]);
     verify([source]);
   }
 
   void fail_yieldEachInNonGenerator_async() {
     // TODO(brianwilkerson) We are currently parsing the yield statement as a binary expression.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() async {", "  yield* 0;", "}"]));
+    Source source = addSource(r'''
+f() async {
+  yield* 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.YIELD_EACH_IN_NON_GENERATOR]);
     verify([source]);
   }
 
   void fail_yieldEachInNonGenerator_sync() {
     // TODO(brianwilkerson) We are currently parsing the yield statement as a binary expression.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  yield* 0;", "}"]));
+    Source source = addSource(r'''
+f() {
+  yield* 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.YIELD_IN_NON_GENERATOR]);
     verify([source]);
   }
 
   void fail_yieldInNonGenerator_async() {
     // TODO(brianwilkerson) We are currently trying to parse the yield statement as a binary expression.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() async {", "  yield 0;", "}"]));
+    Source source = addSource(r'''
+f() async {
+  yield 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.YIELD_IN_NON_GENERATOR]);
     verify([source]);
   }
 
   void fail_yieldInNonGenerator_sync() {
     // TODO(brianwilkerson) We are currently trying to parse the yield statement as a binary expression.
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  yield 0;", "}"]));
+    Source source = addSource(r'''
+f() {
+  yield 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.YIELD_EACH_IN_NON_GENERATOR]);
     verify([source]);
   }
 
   void test_accessPrivateEnumField() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource([
-        "enum E { ONE }",
-        "String name(E e) {",
-        "  return e._name;",
-        "}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+String name(E e) {
+  return e._name;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.ACCESS_PRIVATE_ENUM_FIELD]);
     // Cannot verify because "_name" cannot be resolved.
   }
 
   void test_ambiguousExport() {
-    Source source = addSource(EngineTestCase.createSource([
-        "library L;",
-        "export 'lib1.dart';",
-        "export 'lib2.dart';"]));
-    addNamedSource("/lib1.dart", EngineTestCase.createSource(["library lib1;", "class N {}"]));
-    addNamedSource("/lib2.dart", EngineTestCase.createSource(["library lib2;", "class N {}"]));
+    Source source = addSource(r'''
+library L;
+export 'lib1.dart';
+export 'lib2.dart';''');
+    addNamedSource("/lib1.dart", r'''
+library lib1;
+class N {}''');
+    addNamedSource("/lib2.dart", r'''
+library lib2;
+class N {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.AMBIGUOUS_EXPORT]);
     verify([source]);
   }
 
   void test_asyncForInWrongContext() {
-    Source source = addSource(EngineTestCase.createSource(["f(list) {", "  await for (var e in list) {", "  }", "}"]));
+    Source source = addSource(r'''
+f(list) {
+  await for (var e in list) {
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.ASYNC_FOR_IN_WRONG_CONTEXT]);
     verify([source]);
   }
 
   void test_awaitInWrongContext_sync() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f(x) {", "  return await x;", "}"]));
+    Source source = addSource(r'''
+f(x) {
+  return await x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.AWAIT_IN_WRONG_CONTEXT]);
     verify([source]);
   }
 
   void test_awaitInWrongContext_syncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f(x) sync* {", "  yield await x;", "}"]));
+    Source source = addSource(r'''
+f(x) sync* {
+  yield await x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.AWAIT_IN_WRONG_CONTEXT]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsMixinName_classTypeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class B {}", "class as = A with B;"]));
+    Source source = addSource(r'''
+class A {}
+class B {}
+class as = A with B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsType_formalParameter_field() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  var x;", "  A(static this.x);", "}"]));
+    Source source = addSource(r'''
+class A {
+  var x;
+  A(static this.x);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsType_formalParameter_simple() {
-    Source source = addSource(EngineTestCase.createSource(["f(static x) {", "}"]));
+    Source source = addSource(r'''
+f(static x) {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsType_variableDeclaration() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  typedef x;", "}"]));
+    Source source = addSource(r'''
+f() {
+  typedef x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsTypedefName_functionTypeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["typedef bool as();"]));
+    Source source = addSource("typedef bool as();");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPEDEF_NAME]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsTypeName() {
-    Source source = addSource(EngineTestCase.createSource(["class as {}"]));
+    Source source = addSource("class as {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE_NAME]);
     verify([source]);
   }
 
   void test_builtInIdentifierAsTypeParameterName() {
-    Source source = addSource(EngineTestCase.createSource(["class A<as> {}"]));
+    Source source = addSource("class A<as> {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE_PARAMETER_NAME]);
     verify([source]);
   }
 
   void test_caseExpressionTypeImplementsEquals() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class IntWrapper {",
-        "  final int value;",
-        "  const IntWrapper(this.value);",
-        "  bool operator ==(IntWrapper x) {",
-        "    return value == x.value;",
-        "  }",
-        "  get hashCode => value;",
-        "}",
-        "",
-        "f(var a) {",
-        "  switch(a) {",
-        "    case(const IntWrapper(1)) : return 1;",
-        "    default: return 0;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class IntWrapper {
+  final int value;
+  const IntWrapper(this.value);
+  bool operator ==(IntWrapper x) {
+    return value == x.value;
+  }
+  get hashCode => value;
+}
+
+f(var a) {
+  switch(a) {
+    case(const IntWrapper(1)) : return 1;
+    default: return 0;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]);
     verify([source]);
   }
 
   void test_conflictingConstructorNameAndMember_field() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  A.x() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A.x() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_CONSTRUCTOR_NAME_AND_FIELD]);
     verify([source]);
   }
 
   void test_conflictingConstructorNameAndMember_method() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  const A.x();", "  void x() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  const A.x();
+  void x() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_CONSTRUCTOR_NAME_AND_METHOD]);
     verify([source]);
   }
 
   void test_conflictingGetterAndMethod_field_method() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final int m = 0;",
-        "}",
-        "class B extends A {",
-        "  m() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final int m = 0;
+}
+class B extends A {
+  m() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_GETTER_AND_METHOD]);
     verify([source]);
   }
 
   void test_conflictingGetterAndMethod_getter_method() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  get m => 0;",
-        "}",
-        "class B extends A {",
-        "  m() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  get m => 0;
+}
+class B extends A {
+  m() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_GETTER_AND_METHOD]);
     verify([source]);
   }
 
   void test_conflictingGetterAndMethod_method_field() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "}",
-        "class B extends A {",
-        "  int m;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+}
+class B extends A {
+  int m;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_METHOD_AND_GETTER]);
     verify([source]);
   }
 
   void test_conflictingGetterAndMethod_method_getter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "}",
-        "class B extends A {",
-        "  get m => 0;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+}
+class B extends A {
+  get m => 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_METHOD_AND_GETTER]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndClass() {
-    Source source = addSource(EngineTestCase.createSource(["class T<T> {", "}"]));
+    Source source = addSource(r'''
+class T<T> {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_CLASS]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndMember_field() {
-    Source source = addSource(EngineTestCase.createSource(["class A<T> {", "  var T;", "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  var T;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndMember_getter() {
-    Source source = addSource(EngineTestCase.createSource(["class A<T> {", "  get T => null;", "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  get T => null;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndMember_method() {
-    Source source = addSource(EngineTestCase.createSource(["class A<T> {", "  T() {}", "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  T() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndMember_method_static() {
-    Source source = addSource(EngineTestCase.createSource(["class A<T> {", "  static T() {}", "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  static T() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
     verify([source]);
   }
 
   void test_conflictingTypeVariableAndMember_setter() {
-    Source source = addSource(EngineTestCase.createSource(["class A<T> {", "  set T(x) {}", "}"]));
-    resolve(source);
-    assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
-    verify([source]);
+    Source source = addSource(r'''
+class A<T> {
+  set T(x) {}
+}''');
+    resolve(source);
+    assertErrors(source, [CompileTimeErrorCode.CONFLICTING_TYPE_VARIABLE_AND_MEMBER]);
+    verify([source]);
   }
 
   void test_consistentCaseExpressionTypes_dynamic() {
     // Even though A.S and S have a static type of "dynamic", we should see
     // that they match 'abc', because they are constant strings.
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static const S = 'A.S';",
-        "}",
-        "",
-        "const S = 'S';",
-        "",
-        "foo(var p) {",
-        "  switch (p) {",
-        "    case S:",
-        "      break;",
-        "    case A.S:",
-        "      break;",
-        "    case 'abc':",
-        "      break;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static const S = 'A.S';
+}
+
+const S = 'S';
+
+foo(var p) {
+  switch (p) {
+    case S:
+      break;
+    case A.S:
+      break;
+    case 'abc':
+      break;
+  }
+}''');
     resolve(source);
     assertNoErrors(source);
     verify([source]);
   }
 
   void test_constConstructorWithFieldInitializedByNonConst() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final int i = f();",
-        "  const A();",
-        "}",
-        "int f() {",
-        "  return 3;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final int i = f();
+  const A();
+}
+int f() {
+  return 3;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_FIELD_INITIALIZED_BY_NON_CONST]);
     verify([source]);
   }
 
   void test_constConstructorWithFieldInitializedByNonConst_static() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static final int i = f();",
-        "  const A();",
-        "}",
-        "int f() {",
-        "  return 3;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static final int i = f();
+  const A();
+}
+int f() {
+  return 3;
+}''');
     resolve(source);
     assertNoErrors(source);
     verify([source]);
   }
 
   void test_constConstructorWithMixin() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class M {",
-        "}",
-        "class A extends Object with M {",
-        "  const A();",
-        "}"]));
+    Source source = addSource(r'''
+class M {
+}
+class A extends Object with M {
+  const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_MIXIN]);
     verify([source]);
   }
 
   void test_constConstructorWithNonConstSuper_explicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A();",
-        "}",
-        "class B extends A {",
-        "  const B(): super();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A();
+}
+class B extends A {
+  const B(): super();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_CONST_SUPER]);
     verify([source]);
   }
 
   void test_constConstructorWithNonConstSuper_implicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A();",
-        "}",
-        "class B extends A {",
-        "  const B();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A();
+}
+class B extends A {
+  const B();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_CONST_SUPER]);
     verify([source]);
   }
 
   void test_constConstructorWithNonFinalField_mixin() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  var a;",
-        "}",
-        "class B extends Object with A {",
-        "  const B();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  var a;
+}
+class B extends Object with A {
+  const B();
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_MIXIN,
         CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_FINAL_FIELD]);
     verify([source]);
   }
 
   void test_constConstructorWithNonFinalField_super() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  var a;",
-        "}",
-        "class B extends A {",
-        "  const B();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  var a;
+}
+class B extends A {
+  const B();
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_FINAL_FIELD,
         CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_CONST_SUPER]);
     verify([source]);
   }
 
   void test_constConstructorWithNonFinalField_this() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  const A();", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_NON_FINAL_FIELD]);
     verify([source]);
   }
 
   void test_constDeferredClass() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {", "  const A();", "}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "main() {",
-        "  const a.A();",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {
+  const A();
+}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+main() {
+  const a.A();
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_DEFERRED_CLASS]);
   }
 
   void test_constDeferredClass_namedConstructor() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {", "  const A.b();", "}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "main() {",
-        "  const a.A.b();",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {
+  const A.b();
+}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+main() {
+  const a.A.b();
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_DEFERRED_CLASS]);
   }
 
   void test_constEval_newInstance_constConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  const A();", "}", "const a = new A();"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+const a = new A();''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
     verify([source]);
   }
 
   void test_constEval_newInstance_externalFactoryConstConstructor() {
     // We can't evaluate "const A()" because its constructor is external.  But
     // the code is correct--we shouldn't report an error.
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  external factory const A();",
-        "}",
-        "const x = const A();"]));
+    Source source = addSource(r'''
+class A {
+  external factory const A();
+}
+const x = const A();''');
     resolve(source);
     assertNoErrors(source);
     verify([source]);
   }
 
   void test_constEval_propertyExtraction_targetNotConst() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "  m() {}",
-        "}",
-        "final a = const A();",
-        "const C = a.m;"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+  m() {}
+}
+final a = const A();
+const C = a.m;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
     verify([source]);
   }
 
   void test_constEvalThrowsException_binaryMinus_null() {
     _check_constEvalThrowsException_binary_null("null - 5", false);
     _check_constEvalThrowsException_binary_null("5 - null", true);
   }
 
@@ skipping 39 matching lines @@
     Source source = addSource("const C = (true || 0);");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL,
         StaticTypeWarningCode.NON_BOOL_OPERAND,
         HintCode.DEAD_CODE]);
     verify([source]);
   }
 
   void test_constEvalTypeBoolNumString_equal() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "class B {",
-        "  final a;",
-        "  const B(num p) : a = p == const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+class B {
+  final a;
+  const B(num p) : a = p == const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL_NUM_STRING]);
     verify([source]);
   }
 
   void test_constEvalTypeBoolNumString_notEqual() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "class B {",
-        "  final a;",
-        "  const B(String p) : a = p != const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+class B {
+  final a;
+  const B(String p) : a = p != const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL_NUM_STRING]);
     verify([source]);
   }
 
   void test_constEvalTypeInt_binary() {
     _check_constEvalTypeInt_withParameter_binary("p ^ ''");
     _check_constEvalTypeInt_withParameter_binary("p & ''");
     _check_constEvalTypeInt_withParameter_binary("p | ''");
     _check_constEvalTypeInt_withParameter_binary("p >> ''");
     _check_constEvalTypeInt_withParameter_binary("p << ''");
   }
 
   void test_constEvalTypeNum_binary() {
     _check_constEvalTypeNum_withParameter_binary("p + ''");
     _check_constEvalTypeNum_withParameter_binary("p - ''");
     _check_constEvalTypeNum_withParameter_binary("p * ''");
     _check_constEvalTypeNum_withParameter_binary("p / ''");
     _check_constEvalTypeNum_withParameter_binary("p ~/ ''");
     _check_constEvalTypeNum_withParameter_binary("p > ''");
     _check_constEvalTypeNum_withParameter_binary("p < ''");
     _check_constEvalTypeNum_withParameter_binary("p >= ''");
     _check_constEvalTypeNum_withParameter_binary("p <= ''");
     _check_constEvalTypeNum_withParameter_binary("p % ''");
   }
 
   void test_constFormalParameter_fieldFormalParameter() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  var x;", "  A(const this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  var x;
+  A(const this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_FORMAL_PARAMETER]);
     verify([source]);
   }
 
   void test_constFormalParameter_simpleFormalParameter() {
-    Source source = addSource(EngineTestCase.createSource(["f(const x) {}"]));
+    Source source = addSource("f(const x) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_FORMAL_PARAMETER]);
     verify([source]);
   }
 
   void test_constInitializedWithNonConstValue() {
-    Source source = addSource(EngineTestCase.createSource(["f(p) {", "  const C = p;", "}"]));
+    Source source = addSource(r'''
+f(p) {
+  const C = p;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
     verify([source]);
   }
 
   void test_constInitializedWithNonConstValue_missingConstInListLiteral() {
     Source source = addSource("const List L = [0];");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
     verify([source]);
   }
 
   void test_constInitializedWithNonConstValue_missingConstInMapLiteral() {
     Source source = addSource("const Map M = {'a' : 0};");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE]);
     verify([source]);
   }
 
   void test_constInitializedWithNonConstValueFromDeferredClass() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const V = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "const B = a.V;"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const V = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+const B = a.V;'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_constInitializedWithNonConstValueFromDeferredClass_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const V = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "const B = a.V + 1;"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const V = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+const B = a.V + 1;'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_constInstanceField() {
-    Source source = addSource(EngineTestCase.createSource(["class C {", "  const int f = 0;", "}"]));
+    Source source = addSource(r'''
+class C {
+  const int f = 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_INSTANCE_FIELD]);
     verify([source]);
   }
 
   void test_constMapKeyTypeImplementsEquals_direct() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "  operator ==(other) => false;",
-        "}",
-        "main() {",
-        "  const {const A() : 0};",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+  operator ==(other) => false;
+}
+main() {
+  const {const A() : 0};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_MAP_KEY_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]);
     verify([source]);
   }
 
   void test_constMapKeyTypeImplementsEquals_dynamic() {
     // Note: static type of B.a is "dynamic", but actual type of the const
     // object is A.  We need to make sure we examine the actual type when
     // deciding whether there is a problem with operator==.
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "  operator ==(other) => false;",
-        "}",
-        "class B {",
-        "  static const a = const A();",
-        "}",
-        "main() {",
-        "  const {B.a : 0};",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+  operator ==(other) => false;
+}
+class B {
+  static const a = const A();
+}
+main() {
+  const {B.a : 0};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_MAP_KEY_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]);
     verify([source]);
   }
 
   void test_constMapKeyTypeImplementsEquals_factory() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A { const factory A() = B; }",
-        "",
-        "class B implements A {",
-        "  const B();",
-        "",
-        "  operator ==(o) => true;",
-        "}",
-        "",
-        "main() {",
-        "  var m = const { const A(): 42 };",
-        "}"]));
+    Source source = addSource(r'''
+class A { const factory A() = B; }
+
+class B implements A {
+  const B();
+
+  operator ==(o) => true;
+}
+
+main() {
+  var m = const { const A(): 42 };
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_MAP_KEY_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]);
     verify([source]);
   }
 
   void test_constMapKeyTypeImplementsEquals_super() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "  operator ==(other) => false;",
-        "}",
-        "class B extends A {",
-        "  const B();",
-        "}",
-        "main() {",
-        "  const {const B() : 0};",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+  operator ==(other) => false;
+}
+class B extends A {
+  const B();
+}
+main() {
+  const {const B() : 0};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_MAP_KEY_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]);
     verify([source]);
   }
 
   void test_constWithInvalidTypeParameters() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "f() { return const A<A>(); }"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+f() { return const A<A>(); }''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_INVALID_TYPE_PARAMETERS]);
     verify([source]);
   }
 
   void test_constWithInvalidTypeParameters_tooFew() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class C<K, V> {",
-        "  const C();",
-        "}",
-        "f(p) {",
-        "  return const C<A>();",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class C<K, V> {
+  const C();
+}
+f(p) {
+  return const C<A>();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_INVALID_TYPE_PARAMETERS]);
     verify([source]);
   }
 
   void test_constWithInvalidTypeParameters_tooMany() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class C<E> {",
-        "  const C();",
-        "}",
-        "f(p) {",
-        "  return const C<A, A>();",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class C<E> {
+  const C();
+}
+f(p) {
+  return const C<A, A>();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_INVALID_TYPE_PARAMETERS]);
     verify([source]);
   }
 
   void test_constWithNonConst() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class T {",
-        "  T(a, b, {c, d}) {}",
-        "}",
-        "f() { return const T(0, 1, c: 2, d: 3); }"]));
+    Source source = addSource(r'''
+class T {
+  T(a, b, {c, d}) {}
+}
+f() { return const T(0, 1, c: 2, d: 3); }''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_NON_CONST]);
     verify([source]);
   }
 
   void test_constWithNonConstantArgument_annotation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A(int p);",
-        "}",
-        "var v = 42;",
-        "@A(v)",
-        "main() {",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A(int p);
+}
+var v = 42;
+@A(v)
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_NON_CONSTANT_ARGUMENT]);
     verify([source]);
   }
 
   void test_constWithNonConstantArgument_instanceCreation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A(a);",
-        "}",
-        "f(p) { return const A(p); }"]));
+    Source source = addSource(r'''
+class A {
+  const A(a);
+}
+f(p) { return const A(p); }''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_NON_CONSTANT_ARGUMENT]);
     verify([source]);
   }
 
   void test_constWithNonType() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "f() {", "  return const A();", "}"]));
+    Source source = addSource(r'''
+int A;
+f() {
+  return const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_NON_TYPE]);
     verify([source]);
   }
 
   void test_constWithNonType_fromLibrary() {
     Source source1 = addNamedSource("lib.dart", "");
-    Source source2 = addNamedSource("lib2.dart", EngineTestCase.createSource([
-        "import 'lib.dart' as lib;",
-        "void f() {",
-        "  const lib.A();",
-        "}"]));
+    Source source2 = addNamedSource("lib2.dart", r'''
+import 'lib.dart' as lib;
+void f() {
+  const lib.A();
+}''');
     resolve(source1);
     resolve(source2);
     assertErrors(source2, [CompileTimeErrorCode.CONST_WITH_NON_TYPE]);
     verify([source1]);
   }
 
   void test_constWithTypeParameters_direct() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A<T> {",
-        "  static const V = const A<T>();",
-        "  const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  static const V = const A<T>();
+  const A();
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_WITH_TYPE_PARAMETERS,
         StaticWarningCode.TYPE_PARAMETER_REFERENCED_BY_STATIC]);
     verify([source]);
   }
 
   void test_constWithTypeParameters_indirect() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A<T> {",
-        "  static const V = const A<List<T>>();",
-        "  const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A<T> {
+  static const V = const A<List<T>>();
+  const A();
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_WITH_TYPE_PARAMETERS,
         StaticWarningCode.TYPE_PARAMETER_REFERENCED_BY_STATIC]);
     verify([source]);
   }
 
   void test_constWithUndefinedConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "f() {",
-        "  return const A.noSuchConstructor();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+f() {
+  return const A.noSuchConstructor();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_UNDEFINED_CONSTRUCTOR]);
     // no verify(), 'noSuchConstructor' is not resolved
   }
 
   void test_constWithUndefinedConstructorDefault() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A.name();",
-        "}",
-        "f() {",
-        "  return const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A.name();
+}
+f() {
+  return const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_WITH_UNDEFINED_CONSTRUCTOR_DEFAULT]);
     verify([source]);
   }
 
   void test_defaultValueInFunctionTypeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["typedef F([x = 0]);"]));
+    Source source = addSource("typedef F([x = 0]);");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DEFAULT_VALUE_IN_FUNCTION_TYPE_ALIAS]);
     verify([source]);
   }
 
   void test_defaultValueInFunctionTypedParameter_named() {
-    Source source = addSource(EngineTestCase.createSource(["f(g({p: null})) {}"]));
+    Source source = addSource("f(g({p: null})) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DEFAULT_VALUE_IN_FUNCTION_TYPED_PARAMETER]);
     verify([source]);
   }
 
   void test_defaultValueInFunctionTypedParameter_optional() {
-    Source source = addSource(EngineTestCase.createSource(["f(g([p = null])) {}"]));
+    Source source = addSource("f(g([p = null])) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DEFAULT_VALUE_IN_FUNCTION_TYPED_PARAMETER]);
     verify([source]);
   }
 
   void test_defaultValueInRedirectingFactoryConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  factory A([int x = 0]) = B;",
-        "}",
-        "",
-        "class B implements A {",
-        "  B([int x = 1]) {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A([int x = 0]) = B;
+}
+
+class B implements A {
+  B([int x = 1]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DEFAULT_VALUE_IN_REDIRECTING_FACTORY_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_duplicateConstructorName_named() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A.a() {}", "  A.a() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A.a() {}
+  A.a() {}
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.DUPLICATE_CONSTRUCTOR_NAME,
         CompileTimeErrorCode.DUPLICATE_CONSTRUCTOR_NAME]);
     verify([source]);
   }
 
   void test_duplicateConstructorName_unnamed() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() {}", "  A() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() {}
+  A() {}
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.DUPLICATE_CONSTRUCTOR_DEFAULT,
         CompileTimeErrorCode.DUPLICATE_CONSTRUCTOR_DEFAULT]);
     verify([source]);
   }
 
   void test_duplicateDefinition() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  int m = 0;", "  m(a) {}", "}"]));
+    Source source = addSource(r'''
+f() {
+  int m = 0;
+  m(a) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_acrossLibraries() {
-    Source librarySource = addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "", "part 'a.dart';", "part 'b.dart';"]));
-    Source sourceA = addNamedSource("/a.dart", EngineTestCase.createSource(["part of lib;", "", "class A {}"]));
-    Source sourceB = addNamedSource("/b.dart", EngineTestCase.createSource(["part of lib;", "", "class A {}"]));
+    Source librarySource = addNamedSource("/lib.dart", r'''
+library lib;
+
+part 'a.dart';
+part 'b.dart';''');
+    Source sourceA = addNamedSource("/a.dart", r'''
+part of lib;
+
+class A {}''');
+    Source sourceB = addNamedSource("/b.dart", r'''
+part of lib;
+
+class A {}''');
     resolve(librarySource);
     assertErrors(sourceB, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([librarySource, sourceA, sourceB]);
   }
 
   void test_duplicateDefinition_classMembers_fields() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int a;", "  int a;", "}"]));
+    Source source = addSource(r'''
+class A {
+  int a;
+  int a;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_classMembers_fields_oneStatic() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  static int x;", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  static int x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_classMembers_methods() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  m() {}", "  m() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+  m() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_localFields() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {",
-        "    int a;",
-        "    int a;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {
+    int a;
+    int a;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_parameterWithFunctionName_local() {
-    Source source = addSource(EngineTestCase.createSource(["main() {", "  f(f) {}", "}"]));
+    Source source = addSource(r'''
+main() {
+  f(f) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinition_parameterWithFunctionName_topLevel() {
-    Source source = addSource(EngineTestCase.createSource(["main() {", "  f(f) {}", "}"]));
+    Source source = addSource(r'''
+main() {
+  f(f) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceGetter_staticGetter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int get x => 0;",
-        "}",
-        "class B extends A {",
-        "  static int get x => 0;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int get x => 0;
+}
+class B extends A {
+  static int get x => 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceGetterAbstract_staticGetter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A {",
-        "  int get x;",
-        "}",
-        "class B extends A {",
-        "  static int get x => 0;",
-        "}"]));
+    Source source = addSource(r'''
+abstract class A {
+  int get x;
+}
+class B extends A {
+  static int get x => 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceMethod_staticMethod() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  x() {}",
-        "}",
-        "class B extends A {",
-        "  static x() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  x() {}
+}
+class B extends A {
+  static x() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceMethodAbstract_staticMethod() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A {",
-        "  x();",
-        "}",
-        "abstract class B extends A {",
-        "  static x() {}",
-        "}"]));
+    Source source = addSource(r'''
+abstract class A {
+  x();
+}
+abstract class B extends A {
+  static x() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceSetter_staticSetter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  set x(value) {}",
-        "}",
-        "class B extends A {",
-        "  static set x(value) {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  set x(value) {}
+}
+class B extends A {
+  static set x(value) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateDefinitionInheritance_instanceSetterAbstract_staticSetter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A {",
-        "  set x(value);",
-        "}",
-        "class B extends A {",
-        "  static set x(value) {}",
-        "}"]));
+    Source source = addSource(r'''
+abstract class A {
+  set x(value);
+}
+class B extends A {
+  static set x(value) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_DEFINITION_INHERITANCE]);
     verify([source]);
   }
 
   void test_duplicateNamedArgument() {
-    Source source = addSource(EngineTestCase.createSource(["f({a, b}) {}", "main() {", "  f(a: 1, a: 2);", "}"]));
+    Source source = addSource(r'''
+f({a, b}) {}
+main() {
+  f(a: 1, a: 2);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.DUPLICATE_NAMED_ARGUMENT]);
     verify([source]);
   }
 
   void test_exportInternalLibrary() {
-    Source source = addSource(EngineTestCase.createSource(["export 'dart:_interceptors';"]));
+    Source source = addSource("export 'dart:_interceptors';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXPORT_INTERNAL_LIBRARY]);
     verify([source]);
   }
 
   void test_exportOfNonLibrary() {
-    Source source = addSource(EngineTestCase.createSource(["library L;", "export 'lib1.dart';"]));
-    addNamedSource("/lib1.dart", EngineTestCase.createSource(["part of lib;"]));
+    Source source = addSource(r'''
+library L;
+export 'lib1.dart';''');
+    addNamedSource("/lib1.dart", "part of lib;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXPORT_OF_NON_LIBRARY]);
     verify([source]);
   }
 
   void test_extendsDeferredClass() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class B extends a.A {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.EXTENDS_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class B extends a.A {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.EXTENDS_DEFERRED_CLASS]);
   }
 
   void test_extendsDeferredClass_classTypeAlias() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class M {}",
-        "class C = a.A with M;"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.EXTENDS_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class M {}
+class C = a.A with M;'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.EXTENDS_DEFERRED_CLASS]);
   }
 
   void test_extendsDisallowedClass_class_bool() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends bool {}"]));
+    Source source = addSource("class A extends bool {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_class_double() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends double {}"]));
+    Source source = addSource("class A extends double {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_class_int() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends int {}"]));
+    Source source = addSource("class A extends int {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_class_Null() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Null {}"]));
+    Source source = addSource("class A extends Null {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_class_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends num {}"]));
+    Source source = addSource("class A extends num {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_class_String() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends String {}"]));
+    Source source = addSource("class A extends String {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
         CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_bool() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = bool with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = bool with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_double() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = double with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = double with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_int() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = int with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = int with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_Null() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = Null with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = Null with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_num() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = num with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = num with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsDisallowedClass_classTypeAlias_String() {
-    Source source = addSource(EngineTestCase.createSource(["class M {}", "class C = String with M;"]));
+    Source source = addSource(r'''
+class M {}
+class C = String with M;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_extendsEnum() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource(["enum E { ONE }", "class A extends E {}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+class A extends E {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_ENUM]);
     verify([source]);
   }
 
   void test_extendsNonClass_class() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B extends A {}"]));
+    Source source = addSource(r'''
+int A;
+class B extends A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_NON_CLASS]);
     verify([source]);
   }
 
   void test_extendsNonClass_dynamic() {
-    Source source = addSource(EngineTestCase.createSource(["class B extends dynamic {}"]));
+    Source source = addSource("class B extends dynamic {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTENDS_NON_CLASS]);
     verify([source]);
   }
 
   void test_extraPositionalArguments_const() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "main() {",
-        "  const A(0);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+main() {
+  const A(0);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS]);
     verify([source]);
   }
 
   void test_extraPositionalArguments_const_super() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "class B extends A {",
-        "  const B() : super(0);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+class B extends A {
+  const B() : super(0);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS]);
     verify([source]);
   }
 
   void test_fieldInitializedByMultipleInitializers() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  A() : x = 0, x = 1 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A() : x = 0, x = 1 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS]);
     verify([source]);
   }
 
   void test_fieldInitializedByMultipleInitializers_multipleInits() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int x;",
-        "  A() : x = 0, x = 1, x = 2 {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A() : x = 0, x = 1, x = 2 {}
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS,
         CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS]);
     verify([source]);
   }
 
   void test_fieldInitializedByMultipleInitializers_multipleNames() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int x;",
-        "  int y;",
-        "  A() : x = 0, x = 1, y = 0, y = 1 {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  int y;
+  A() : x = 0, x = 1, y = 0, y = 1 {}
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS,
         CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS]);
     verify([source]);
   }
 
   void test_fieldInitializedInParameterAndInitializer() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  A(this.x) : x = 1 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A(this.x) : x = 1 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZED_IN_PARAMETER_AND_INITIALIZER]);
     verify([source]);
   }
 
   void test_fieldInitializerFactoryConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  factory A(this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  factory A(this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZER_FACTORY_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_fieldInitializerOutsideConstructor() {
     // TODO(brianwilkerson) Fix the duplicate error messages.
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  m(this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  m(this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [
         ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR,
         CompileTimeErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_fieldInitializerOutsideConstructor_defaultParameter() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int x;", "  m([this.x]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  m([this.x]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_fieldInitializerRedirectingConstructor_afterRedirection() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int x;",
-        "  A.named() {}",
-        "  A() : this.named(), x = 42;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A.named() {}
+  A() : this.named(), x = 42;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_fieldInitializerRedirectingConstructor_beforeRedirection() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int x;",
-        "  A.named() {}",
-        "  A() : x = 42, this.named();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A.named() {}
+  A() : x = 42, this.named();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_fieldInitializingFormalRedirectingConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int x;",
-        "  A.named() {}",
-        "  A(this.x) : this.named();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int x;
+  A.named() {}
+  A(this.x) : this.named();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_finalInitializedMultipleTimes_initializers() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  final x;", "  A() : x = 0, x = 0 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  final x;
+  A() : x = 0, x = 0 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS]);
     verify([source]);
   }
 
   /**
    * This test doesn't test the FINAL_INITIALIZED_MULTIPLE_TIMES code, but tests the
    * FIELD_INITIALIZED_IN_PARAMETER_AND_INITIALIZER code instead. It is provided here to show
    * coverage over all of the permutations of initializers in constructor declarations.
    *
    * Note: FIELD_INITIALIZED_IN_PARAMETER_AND_INITIALIZER covers a subset of
    * FINAL_INITIALIZED_MULTIPLE_TIMES, since it more specific, we use it instead of the broader code
    */
   void test_finalInitializedMultipleTimes_initializingFormal_initializer() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  final x;", "  A(this.x) : x = 0 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  final x;
+  A(this.x) : x = 0 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FIELD_INITIALIZED_IN_PARAMETER_AND_INITIALIZER]);
     verify([source]);
   }
 
   void test_finalInitializedMultipleTimes_initializingFormals() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  final x;", "  A(this.x, this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  final x;
+  A(this.x, this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.FINAL_INITIALIZED_MULTIPLE_TIMES]);
     verify([source]);
   }
 
   void test_finalNotInitialized_instanceField_const_static() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static const F;", "}"]));
+    Source source = addSource(r'''
+class A {
+  static const F;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_NOT_INITIALIZED]);
     verify([source]);
   }
 
   void test_finalNotInitialized_library_const() {
-    Source source = addSource(EngineTestCase.createSource(["const F;"]));
+    Source source = addSource("const F;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_NOT_INITIALIZED]);
     verify([source]);
   }
 
   void test_finalNotInitialized_local_const() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  const int x;", "}"]));
+    Source source = addSource(r'''
+f() {
+  const int x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.CONST_NOT_INITIALIZED]);
     verify([source]);
   }
 
   void test_fromEnvironment_bool_badArgs() {
-    Source source = addSource(EngineTestCase.createSource([
-        "var b1 = const bool.fromEnvironment(1);",
-        "var b2 = const bool.fromEnvironment('x', defaultValue: 1);"]));
+    Source source = addSource(r'''
+var b1 = const bool.fromEnvironment(1);
+var b2 = const bool.fromEnvironment('x', defaultValue: 1);''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE,
         CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
   }
 
   void test_fromEnvironment_bool_badDefault_whenDefined() {
     // The type of the defaultValue needs to be correct even when the default value
     // isn't used (because the variable is defined in the environment).
     analysisContext2.declaredVariables.define("x", "true");
-    Source source = addSource(EngineTestCase.createSource(["var b = const bool.fromEnvironment('x', defaultValue: 1);"]));
+    Source source = addSource("var b = const bool.fromEnvironment('x', defaultValue: 1);");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
   }
 
   void test_getterAndMethodWithSameName() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  x(y) {}", "  get x => 0;", "}"]));
+    Source source = addSource(r'''
+class A {
+  x(y) {}
+  get x => 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.GETTER_AND_METHOD_WITH_SAME_NAME]);
     verify([source]);
   }
 
   void test_implementsDeferredClass() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class B implements a.A {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.IMPLEMENTS_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class B implements a.A {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.IMPLEMENTS_DEFERRED_CLASS]);
   }
 
   void test_implementsDeferredClass_classTypeAlias() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class B {}",
-        "class M {}",
-        "class C = B with M implements a.A;"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.IMPLEMENTS_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class B {}
+class M {}
+class C = B with M implements a.A;'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.IMPLEMENTS_DEFERRED_CLASS]);
   }
 
   void test_implementsDisallowedClass_class_bool() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements bool {}"]));
+    Source source = addSource("class A implements bool {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_double() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements double {}"]));
+    Source source = addSource("class A implements double {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_int() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements int {}"]));
+    Source source = addSource("class A implements int {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_Null() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements Null {}"]));
+    Source source = addSource("class A implements Null {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements num {}"]));
+    Source source = addSource("class A implements num {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_String() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements String {}"]));
+    Source source = addSource("class A implements String {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_class_String_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements String, num {}"]));
+    Source source = addSource("class A implements String, num {}");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS,
         CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_bool() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements bool;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements bool;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_double() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements double;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements double;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_int() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements int;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements int;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_Null() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements Null;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements Null;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_num() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements num;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements num;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_String() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements String;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements String;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDisallowedClass_classTypeAlias_String_num() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class C = A with M implements String, num;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class C = A with M implements String, num;''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS,
         CompileTimeErrorCode.IMPLEMENTS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_implementsDynamic() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements dynamic {}"]));
+    Source source = addSource("class A implements dynamic {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_DYNAMIC]);
     verify([source]);
   }
 
   void test_implementsEnum() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource(["enum E { ONE }", "class A implements E {}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+class A implements E {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_ENUM]);
     verify([source]);
   }
 
   void test_implementsNonClass_class() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B implements A {}"]));
+    Source source = addSource(r'''
+int A;
+class B implements A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_NON_CLASS]);
     verify([source]);
   }
 
   void test_implementsNonClass_typeAlias() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "int B;",
-        "class C = A with M implements B;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+int B;
+class C = A with M implements B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_NON_CLASS]);
     verify([source]);
   }
 
   void test_implementsRepeated() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class B implements A, A {}"]));
+    Source source = addSource(r'''
+class A {}
+class B implements A, A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_REPEATED]);
     verify([source]);
   }
 
   void test_implementsRepeated_3times() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {} class C{}",
-        "class B implements A, A, A, A {}"]));
+    Source source = addSource(r'''
+class A {} class C{}
+class B implements A, A, A, A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.IMPLEMENTS_REPEATED,
         CompileTimeErrorCode.IMPLEMENTS_REPEATED,
         CompileTimeErrorCode.IMPLEMENTS_REPEATED]);
     verify([source]);
   }
 
   void test_implementsSuperClass() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class B extends A implements A {}"]));
+    Source source = addSource(r'''
+class A {}
+class B extends A implements A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_SUPER_CLASS]);
     verify([source]);
   }
 
   void test_implementsSuperClass_Object() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements Object {}"]));
+    Source source = addSource("class A implements Object {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLEMENTS_SUPER_CLASS]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_field() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  var v;",
-        "  A() : v = f;",
-        "  var f;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  var v;
+  A() : v = f;
+  var f;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_field2() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  final x = 0;", "  final y = x;", "}"]));
+    Source source = addSource(r'''
+class A {
+  final x = 0;
+  final y = x;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_invocation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  var v;",
-        "  A() : v = f();",
-        "  f() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  var v;
+  A() : v = f();
+  f() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_invocationInStatic() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static var F = m();", "  m() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  static var F = m();
+  m() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_redirectingConstructorInvocation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A(p) {}",
-        "  A.named() : this(f);",
-        "  var f;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A(p) {}
+  A.named() : this(f);
+  var f;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_implicitThisReferenceInInitializer_superConstructorInvocation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A(p) {}",
-        "}",
-        "class B extends A {",
-        "  B() : super(f);",
-        "  var f;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A(p) {}
+}
+class B extends A {
+  B() : super(f);
+  var f;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPLICIT_THIS_REFERENCE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_importInternalLibrary() {
-    Source source = addSource(EngineTestCase.createSource(["import 'dart:_interceptors';"]));
+    Source source = addSource("import 'dart:_interceptors';");
     resolve(source);
     // Note, in these error cases we may generate an UNUSED_IMPORT hint, while we could prevent
     // the hint from being generated by testing the import directive for the error, this is such a
     // minor corner case that we don't think we should add the additional computation time to figure
     // out such cases.
     assertErrors(source, [
         CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY,
         HintCode.UNUSED_IMPORT]);
     verify([source]);
   }
 
   void test_importInternalLibrary_js_helper() {
-    Source source = addSource(EngineTestCase.createSource(["import 'dart:_js_helper';"]));
+    Source source = addSource("import 'dart:_js_helper';");
     resolve(source);
     // Note, in these error cases we may generate an UNUSED_IMPORT hint, while we could prevent
     // the hint from being generated by testing the import directive for the error, this is such a
     // minor corner case that we don't think we should add the additional computation time to figure
     // out such cases.
     assertErrors(source, [
         CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY,
         HintCode.UNUSED_IMPORT]);
     verify([source]);
   }
 
   void test_importOfNonLibrary() {
-    Source source = addSource(EngineTestCase.createSource(["library lib;", "import 'part.dart';", "A a;"]));
-    addNamedSource("/part.dart", EngineTestCase.createSource(["part of lib;", "class A{}"]));
+    Source source = addSource(r'''
+library lib;
+import 'part.dart';
+A a;''');
+    addNamedSource("/part.dart", r'''
+part of lib;
+class A{}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY]);
     verify([source]);
   }
 
   void test_inconsistentCaseExpressionTypes() {
-    Source source = addSource(EngineTestCase.createSource([
-        "f(var p) {",
-        "  switch (p) {",
-        "    case 1:",
-        "      break;",
-        "    case 'a':",
-        "      break;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+f(var p) {
+  switch (p) {
+    case 1:
+      break;
+    case 'a':
+      break;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES]);
     verify([source]);
   }
 
   void test_inconsistentCaseExpressionTypes_dynamic() {
     // Even though A.S and S have a static type of "dynamic", we should see
     // that they fail to match 3, because they are constant strings.
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static const S = 'A.S';",
-        "}",
-        "",
-        "const S = 'S';",
-        "",
-        "foo(var p) {",
-        "  switch (p) {",
-        "    case 3:",
-        "      break;",
-        "    case S:",
-        "      break;",
-        "    case A.S:",
-        "      break;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static const S = 'A.S';
+}
+
+const S = 'S';
+
+foo(var p) {
+  switch (p) {
+    case 3:
+      break;
+    case S:
+      break;
+    case A.S:
+      break;
+  }
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES,
         CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES]);
     verify([source]);
   }
 
   void test_inconsistentCaseExpressionTypes_repeated() {
-    Source source = addSource(EngineTestCase.createSource([
-        "f(var p) {",
-        "  switch (p) {",
-        "    case 1:",
-        "      break;",
-        "    case 'a':",
-        "      break;",
-        "    case 'b':",
-        "      break;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+f(var p) {
+  switch (p) {
+    case 1:
+      break;
+    case 'a':
+      break;
+    case 'b':
+      break;
+  }
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES,
         CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES]);
     verify([source]);
   }
 
   void test_initializerForNonExistent_const() {
     // Check that the absence of a matching field doesn't cause a
     // crash during constant evaluation.
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A() : x = 'foo';",
-        "}",
-        "A a = const A();"]));
+    Source source = addSource(r'''
+class A {
+  const A() : x = 'foo';
+}
+A a = const A();''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZER_FOR_NON_EXISTENT_FIELD]);
   }
 
   void test_initializerForNonExistent_initializer() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() : x = 0 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() : x = 0 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZER_FOR_NON_EXISTENT_FIELD]);
   }
 
   void test_initializerForStaticField() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static int x;", "  A() : x = 0 {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  static int x;
+  A() : x = 0 {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZER_FOR_STATIC_FIELD]);
     verify([source]);
   }
 
   void test_initializingFormalForNonExistentField() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A(this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A(this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZING_FORMAL_FOR_NON_EXISTENT_FIELD]);
     verify([source]);
   }
 
   void test_initializingFormalForNonExistentField_notInEnclosingClass() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "int x;",
-        "}",
-        "class B extends A {",
-        "  B(this.x) {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+int x;
+}
+class B extends A {
+  B(this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZING_FORMAL_FOR_NON_EXISTENT_FIELD]);
     verify([source]);
   }
 
   void test_initializingFormalForNonExistentField_optional() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A([this.x]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A([this.x]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZING_FORMAL_FOR_NON_EXISTENT_FIELD]);
     verify([source]);
   }
 
   void test_initializingFormalForNonExistentField_synthetic() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int get x => 1;", "  A(this.x) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int get x => 1;
+  A(this.x) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZING_FORMAL_FOR_NON_EXISTENT_FIELD]);
     verify([source]);
   }
 
   void test_initializingFormalForStaticField() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static int x;", "  A([this.x]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  static int x;
+  A([this.x]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INITIALIZING_FORMAL_FOR_STATIC_FIELD]);
     verify([source]);
   }
 
   void test_instanceMemberAccessFromFactory_named() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "  A();",
-        "  factory A.make() {",
-        "    m();",
-        "    return new A();",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+  A();
+  factory A.make() {
+    m();
+    return new A();
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANCE_MEMBER_ACCESS_FROM_FACTORY]);
     verify([source]);
   }
 
   void test_instanceMemberAccessFromFactory_unnamed() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "  A._();",
-        "  factory A() {",
-        "    m();",
-        "    return new A._();",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+  A._();
+  factory A() {
+    m();
+    return new A._();
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANCE_MEMBER_ACCESS_FROM_FACTORY]);
     verify([source]);
   }
 
   void test_instanceMemberAccessFromStatic_field() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  int f;",
-        "  static foo() {",
-        "    f;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  int f;
+  static foo() {
+    f;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANCE_MEMBER_ACCESS_FROM_STATIC]);
     verify([source]);
   }
 
   void test_instanceMemberAccessFromStatic_getter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  get g => null;",
-        "  static foo() {",
-        "    g;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  get g => null;
+  static foo() {
+    g;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANCE_MEMBER_ACCESS_FROM_STATIC]);
     verify([source]);
   }
 
   void test_instanceMemberAccessFromStatic_method() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "  static foo() {",
-        "    m();",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+  static foo() {
+    m();
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANCE_MEMBER_ACCESS_FROM_STATIC]);
     verify([source]);
   }
 
   void test_instantiateEnum_const() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource([
-        "enum E { ONE }",
-        "E e(String name) {",
-        "  return const E();",
-        "}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+E e(String name) {
+  return const E();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANTIATE_ENUM]);
     verify([source]);
   }
 
   void test_instantiateEnum_new() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource([
-        "enum E { ONE }",
-        "E e(String name) {",
-        "  return new E();",
-        "}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+E e(String name) {
+  return new E();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INSTANTIATE_ENUM]);
     verify([source]);
   }
 
   void test_invalidAnnotation_getter() {
-    Source source = addSource(EngineTestCase.createSource(["get V => 0;", "@V", "main() {", "}"]));
+    Source source = addSource(r'''
+get V => 0;
+@V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_importWithPrefix_getter() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "get V => 0;"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "@p.V", "main() {", "}"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+get V => 0;''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+@p.V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_importWithPrefix_notConstantVariable() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "final V = 0;"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "@p.V", "main() {", "}"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+final V = 0;''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+@p.V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_importWithPrefix_notVariableOrConstructorInvocation() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "typedef V();"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "@p.V", "main() {", "}"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+typedef V();''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+@p.V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_notConstantVariable() {
-    Source source = addSource(EngineTestCase.createSource(["final V = 0;", "@V", "main() {", "}"]));
+    Source source = addSource(r'''
+final V = 0;
+@V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_notVariableOrConstructorInvocation() {
-    Source source = addSource(EngineTestCase.createSource(["typedef V();", "@V", "main() {", "}"]));
+    Source source = addSource(r'''
+typedef V();
+@V
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_staticMethodReference() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static f() {}",
-        "}",
-        "@A.f",
-        "main() {",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static f() {}
+}
+@A.f
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
     verify([source]);
   }
 
   void test_invalidAnnotation_unresolved_identifier() {
-    Source source = addSource(EngineTestCase.createSource(["@unresolved", "main() {", "}"]));
+    Source source = addSource(r'''
+@unresolved
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
   }
 
   void test_invalidAnnotation_unresolved_invocation() {
-    Source source = addSource(EngineTestCase.createSource(["@Unresolved()", "main() {", "}"]));
+    Source source = addSource(r'''
+@Unresolved()
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
   }
 
   void test_invalidAnnotation_unresolved_prefixedIdentifier() {
-    Source source = addSource(EngineTestCase.createSource([
-        "import 'dart:math' as p;",
-        "@p.unresolved",
-        "main() {",
-        "}"]));
+    Source source = addSource(r'''
+import 'dart:math' as p;
+@p.unresolved
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
   }
 
   void test_invalidAnnotation_useLibraryScope() {
-    Source source = addSource(EngineTestCase.createSource(["@foo", "class A {", "  static const foo = null;", "}"]));
+    Source source = addSource(r'''
+@foo
+class A {
+  static const foo = null;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_ANNOTATION]);
   }
 
   void test_invalidAnnotationFromDeferredLibrary() {
     // See test_invalidAnnotation_notConstantVariable
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource([
-        "library lib1;",
-        "class V { const V(); }",
-        "const v = const V();"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "@a.v main () {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+class V { const V(); }
+const v = const V();''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+@a.v main () {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_invalidAnnotationFromDeferredLibrary_constructor() {
     // See test_invalidAnnotation_notConstantVariable
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class C { const C(); }"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "@a.C() main () {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+class C { const C(); }''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+@a.C() main () {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_invalidAnnotationFromDeferredLibrary_namedConstructor() {
     // See test_invalidAnnotation_notConstantVariable
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class C { const C.name(); }"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "@a.C.name() main () {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+class C { const C.name(); }''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+@a.C.name() main () {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.INVALID_ANNOTATION_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_invalidConstructorName_notEnclosingClassName_defined() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  B() : super();", "}", "class B {}"]));
+    Source source = addSource(r'''
+class A {
+  B() : super();
+}
+class B {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_CONSTRUCTOR_NAME]);
     // no verify() call, "B" is not resolved
   }
 
   void test_invalidConstructorName_notEnclosingClassName_undefined() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  B() : super();", "}"]));
+    Source source = addSource(r'''
+class A {
+  B() : super();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_CONSTRUCTOR_NAME]);
     // no verify() call, "B" is not resolved
   }
 
   void test_invalidFactoryNameNotAClass_notClassName() {
-    Source source = addSource(EngineTestCase.createSource(["int B;", "class A {", "  factory B() {}", "}"]));
+    Source source = addSource(r'''
+int B;
+class A {
+  factory B() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_FACTORY_NAME_NOT_A_CLASS]);
     verify([source]);
   }
 
   void test_invalidFactoryNameNotAClass_notEnclosingClassName() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  factory B() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  factory B() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_FACTORY_NAME_NOT_A_CLASS]);
     // no verify() call, "B" is not resolved
   }
 
   void test_invalidModifierOnConstructor_async() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() async {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() async {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_invalidModifierOnConstructor_asyncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() async* {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() async* {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_invalidModifierOnConstructor_syncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() sync* {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() sync* {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_member_async() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x(v) async {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x(v) async {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_member_asyncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x(v) async* {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x(v) async* {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_member_syncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x(v) sync* {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x(v) sync* {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_topLevel_async() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["set x(v) async {}"]));
+    Source source = addSource("set x(v) async {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_topLevel_asyncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["set x(v) async* {}"]));
+    Source source = addSource("set x(v) async* {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidModifierOnSetter_topLevel_syncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["set x(v) sync* {}"]));
+    Source source = addSource("set x(v) sync* {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_MODIFIER_ON_SETTER]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_factoryConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  factory A() { return this; }", "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A() { return this; }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_instanceVariableInitializer_inConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  var f;", "  A() : f = this;", "}"]));
+    Source source = addSource(r'''
+class A {
+  var f;
+  A() : f = this;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_instanceVariableInitializer_inDeclaration() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  var f = this;", "}"]));
+    Source source = addSource(r'''
+class A {
+  var f = this;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_staticMethod() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static m() { return this; }", "}"]));
+    Source source = addSource(r'''
+class A {
+  static m() { return this; }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_staticVariableInitializer() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  static A f = this;", "}"]));
+    Source source = addSource(r'''
+class A {
+  static A f = this;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_superInitializer() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A(var x) {}",
-        "}",
-        "class B extends A {",
-        "  B() : super(this);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A(var x) {}
+}
+class B extends A {
+  B() : super(this);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_topLevelFunction() {
     Source source = addSource("f() { return this; }");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidReferenceToThis_variableInitializer() {
     Source source = addSource("int x = this;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_REFERENCE_TO_THIS]);
     verify([source]);
   }
 
   void test_invalidTypeArgumentInConstList() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A<E> {",
-        "  m() {",
-        "    return const <E>[];",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A<E> {
+  m() {
+    return const <E>[];
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_TYPE_ARGUMENT_IN_CONST_LIST]);
     verify([source]);
   }
 
   void test_invalidTypeArgumentInConstMap() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A<E> {",
-        "  m() {",
-        "    return const <String, E>{};",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A<E> {
+  m() {
+    return const <String, E>{};
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_TYPE_ARGUMENT_IN_CONST_MAP]);
     verify([source]);
   }
 
   void test_invalidUri_export() {
-    Source source = addSource(EngineTestCase.createSource(["export 'ht:';"]));
+    Source source = addSource("export 'ht:';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_invalidUri_import() {
-    Source source = addSource(EngineTestCase.createSource(["import 'ht:';"]));
+    Source source = addSource("import 'ht:';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_invalidUri_part() {
-    Source source = addSource(EngineTestCase.createSource(["part 'ht:';"]));
+    Source source = addSource("part 'ht:';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_labelInOuterScope() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  void m(int i) {",
-        "    l: while (i > 0) {",
-        "      void f() {",
-        "        break l;",
-        "      };",
-        "    }",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  void m(int i) {
+    l: while (i > 0) {
+      void f() {
+        break l;
+      };
+    }
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.LABEL_IN_OUTER_SCOPE]);
     // We cannot verify resolution with unresolvable labels
   }
 
   void test_labelUndefined_break() {
-    Source source = addSource(EngineTestCase.createSource([
-        "f() {",
-        "  x: while (true) {",
-        "    break y;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+f() {
+  x: while (true) {
+    break y;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.LABEL_UNDEFINED]);
     // We cannot verify resolution with undefined labels
   }
 
   void test_labelUndefined_continue() {
-    Source source = addSource(EngineTestCase.createSource([
-        "f() {",
-        "  x: while (true) {",
-        "    continue y;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+f() {
+  x: while (true) {
+    continue y;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.LABEL_UNDEFINED]);
     // We cannot verify resolution with undefined labels
   }
 
   void test_memberWithClassName_field() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int A = 0;", "}"]));
+    Source source = addSource(r'''
+class A {
+  int A = 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MEMBER_WITH_CLASS_NAME]);
     verify([source]);
   }
 
   void test_memberWithClassName_field2() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int z, A, b = 0;", "}"]));
+    Source source = addSource(r'''
+class A {
+  int z, A, b = 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MEMBER_WITH_CLASS_NAME]);
     verify([source]);
   }
 
   void test_memberWithClassName_getter() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  get A => 0;", "}"]));
+    Source source = addSource(r'''
+class A {
+  get A => 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MEMBER_WITH_CLASS_NAME]);
     verify([source]);
   }
 
   void test_memberWithClassName_method() {
     // no test because indistinguishable from constructor
   }
 
   void test_methodAndGetterWithSameName() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  get x => 0;", "  x(y) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  get x => 0;
+  x(y) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.METHOD_AND_GETTER_WITH_SAME_NAME]);
     verify([source]);
   }
 
   void test_missingEnumConstantInSwitch() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource([
-        "enum E { ONE, TWO, THREE, FOUR }",
-        "bool odd(E e) {",
-        "  switch (e) {",
-        "    case E.ONE:",
-        "    case E.THREE: return true;",
-        "  }",
-        "  return false;",
-        "}"]));
+    Source source = addSource(r'''
+enum E { ONE, TWO, THREE, FOUR }
+bool odd(E e) {
+  switch (e) {
+    case E.ONE:
+    case E.THREE: return true;
+  }
+  return false;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.MISSING_ENUM_CONSTANT_IN_SWITCH,
         CompileTimeErrorCode.MISSING_ENUM_CONSTANT_IN_SWITCH]);
     verify([source]);
   }
 
   void test_mixinDeclaresConstructor_classDeclaration() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A() {}",
-        "}",
-        "class B extends Object with A {}"]));
+    Source source = addSource(r'''
+class A {
+  A() {}
+}
+class B extends Object with A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_DECLARES_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_mixinDeclaresConstructor_typeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() {}", "}", "class B = Object with A;"]));
+    Source source = addSource(r'''
+class A {
+  A() {}
+}
+class B = Object with A;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_DECLARES_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_mixinDeferredClass() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class B extends Object with a.A {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.MIXIN_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class B extends Object with a.A {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.MIXIN_DEFERRED_CLASS]);
   }
 
   void test_mixinDeferredClass_classTypeAlias() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "class A {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class B {}",
-        "class C = B with a.A;"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.MIXIN_DEFERRED_CLASS]);
+        r'''
+library lib1;
+class A {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class B {}
+class C = B with a.A;'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.MIXIN_DEFERRED_CLASS]);
   }
 
   void test_mixinInheritsFromNotObject_classDeclaration_extends() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends A {}",
-        "class C extends Object with B {}"]));
+    Source source = addSource(r'''
+class A {}
+class B extends A {}
+class C extends Object with B {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_INHERITS_FROM_NOT_OBJECT]);
     verify([source]);
   }
 
   void test_mixinInheritsFromNotObject_classDeclaration_with() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends Object with A {}",
-        "class C extends Object with B {}"]));
+    Source source = addSource(r'''
+class A {}
+class B extends Object with A {}
+class C extends Object with B {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_INHERITS_FROM_NOT_OBJECT]);
     verify([source]);
   }
 
   void test_mixinInheritsFromNotObject_typeAlias_extends() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends A {}",
-        "class C = Object with B;"]));
+    Source source = addSource(r'''
+class A {}
+class B extends A {}
+class C = Object with B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_INHERITS_FROM_NOT_OBJECT]);
     verify([source]);
   }
 
   void test_mixinInheritsFromNotObject_typeAlias_with() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends Object with A {}",
-        "class C = Object with B;"]));
+    Source source = addSource(r'''
+class A {}
+class B extends Object with A {}
+class C = Object with B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_INHERITS_FROM_NOT_OBJECT]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_bool() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with bool {}"]));
+    Source source = addSource("class A extends Object with bool {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_double() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with double {}"]));
+    Source source = addSource("class A extends Object with double {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_int() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with int {}"]));
+    Source source = addSource("class A extends Object with int {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_Null() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with Null {}"]));
+    Source source = addSource("class A extends Object with Null {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with num {}"]));
+    Source source = addSource("class A extends Object with num {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_class_String() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends Object with String {}"]));
+    Source source = addSource("class A extends Object with String {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_bool() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with bool;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with bool;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_double() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with double;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with double;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_int() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with int;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with int;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_Null() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with Null;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with Null;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with num;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with num;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_String() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with String;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with String;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfDisallowedClass_classTypeAlias_String_num() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "class C = A with String, num;"]));
+    Source source = addSource(r'''
+class A {}
+class C = A with String, num;''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS,
         CompileTimeErrorCode.MIXIN_OF_DISALLOWED_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfEnum() {
     AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
     analysisOptions.enableEnum = true;
     resetWithOptions(analysisOptions);
-    Source source = addSource(EngineTestCase.createSource(["enum E { ONE }", "class A extends Object with E {}"]));
+    Source source = addSource(r'''
+enum E { ONE }
+class A extends Object with E {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_ENUM]);
     verify([source]);
   }
 
   void test_mixinOfNonClass_class() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B extends Object with A {}"]));
+    Source source = addSource(r'''
+int A;
+class B extends Object with A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_NON_CLASS]);
     verify([source]);
   }
 
   void test_mixinOfNonClass_typeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["class A {}", "int B;", "class C = A with B;"]));
+    Source source = addSource(r'''
+class A {}
+int B;
+class C = A with B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_OF_NON_CLASS]);
     verify([source]);
   }
 
   void test_mixinReferencesSuper() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  toString() => super.toString();",
-        "}",
-        "class B extends Object with A {}"]));
+    Source source = addSource(r'''
+class A {
+  toString() => super.toString();
+}
+class B extends Object with A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_REFERENCES_SUPER]);
     verify([source]);
   }
 
   void test_mixinWithNonClassSuperclass_class() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B {}", "class C extends A with B {}"]));
+    Source source = addSource(r'''
+int A;
+class B {}
+class C extends A with B {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_WITH_NON_CLASS_SUPERCLASS]);
     verify([source]);
   }
 
   void test_mixinWithNonClassSuperclass_typeAlias() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B {}", "class C = A with B;"]));
+    Source source = addSource(r'''
+int A;
+class B {}
+class C = A with B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MIXIN_WITH_NON_CLASS_SUPERCLASS]);
     verify([source]);
   }
 
   void test_multipleRedirectingConstructorInvocations() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A() : this.a(), this.b();",
-        "  A.a() {}",
-        "  A.b() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A() : this.a(), this.b();
+  A.a() {}
+  A.b() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MULTIPLE_REDIRECTING_CONSTRUCTOR_INVOCATIONS]);
     verify([source]);
   }
 
   void test_multipleSuperInitializers() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends A {",
-        "  B() : super(), super() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class B extends A {
+  B() : super(), super() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.MULTIPLE_SUPER_INITIALIZERS]);
     verify([source]);
   }
 
   void test_nativeClauseInNonSDKCode() {
     // TODO(jwren) Move this test somewhere else: This test verifies a parser error code is generated
     // through the ErrorVerifier, it is not a CompileTimeErrorCode.
-    Source source = addSource(EngineTestCase.createSource(["class A native 'string' {}"]));
+    Source source = addSource("class A native 'string' {}");
     resolve(source);
     assertErrors(source, [ParserErrorCode.NATIVE_CLAUSE_IN_NON_SDK_CODE]);
     verify([source]);
   }
 
   void test_nativeFunctionBodyInNonSDKCode_function() {
     // TODO(jwren) Move this test somewhere else: This test verifies a parser error code is generated
     // through the ErrorVerifier, it is not a CompileTimeErrorCode.
-    Source source = addSource(EngineTestCase.createSource(["int m(a) native 'string';"]));
+    Source source = addSource("int m(a) native 'string';");
     resolve(source);
     assertErrors(source, [ParserErrorCode.NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE]);
     verify([source]);
   }
 
   void test_nativeFunctionBodyInNonSDKCode_method() {
     // TODO(jwren) Move this test somewhere else: This test verifies a parser error code is generated
     // through the ErrorVerifier, it is not a CompileTimeErrorCode.
-    Source source = addSource(EngineTestCase.createSource(["class A{", "  static int m(a) native 'string';", "}"]));
+    Source source = addSource(r'''
+class A{
+  static int m(a) native 'string';
+}''');
     resolve(source);
     assertErrors(source, [ParserErrorCode.NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE]);
     verify([source]);
   }
 
   void test_noAnnotationConstructorArguments() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  const A();", "}", "@A", "main() {", "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+@A
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NO_ANNOTATION_CONSTRUCTOR_ARGUMENTS]);
     verify([source]);
   }
 
   void test_noDefaultSuperConstructorExplicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A(p);",
-        "}",
-        "class B extends A {",
-        "  B() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A(p);
+}
+class B extends A {
+  B() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_EXPLICIT]);
     verify([source]);
   }
 
   void test_noDefaultSuperConstructorImplicit_superHasParameters() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A(p);", "}", "class B extends A {", "}"]));
+    Source source = addSource(r'''
+class A {
+  A(p);
+}
+class B extends A {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_noDefaultSuperConstructorImplicit_superOnlyNamed() {
-    Source source = addSource(EngineTestCase.createSource(["class A { A.named() {} }", "class B extends A {}"]));
+    Source source = addSource(r'''
+class A { A.named() {} }
+class B extends A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT]);
     verify([source]);
   }
 
   void test_nonConstantAnnotationConstructor_named() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A.fromInt() {}",
-        "}",
-        "@A.fromInt()",
-        "main() {",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A.fromInt() {}
+}
+@A.fromInt()
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_ANNOTATION_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_nonConstantAnnotationConstructor_unnamed() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() {}", "}", "@A()", "main() {", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() {}
+}
+@A()
+main() {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_ANNOTATION_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_function_named() {
-    Source source = addSource(EngineTestCase.createSource(["int y;", "f({x : y}) {}"]));
+    Source source = addSource(r'''
+int y;
+f({x : y}) {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_function_positional() {
-    Source source = addSource(EngineTestCase.createSource(["int y;", "f([x = y]) {}"]));
+    Source source = addSource(r'''
+int y;
+f([x = y]) {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_inConstructor_named() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int y;", "  A({x : y}) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int y;
+  A({x : y}) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_inConstructor_positional() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int y;", "  A([x = y]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int y;
+  A([x = y]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_method_named() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int y;", "  m({x : y}) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int y;
+  m({x : y}) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValue_method_positional() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  int y;", "  m([x = y]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  int y;
+  m([x = y]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE]);
     verify([source]);
   }
 
   void test_nonConstantDefaultValueFromDeferredLibrary() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const V = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f({x : a.V}) {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const V = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f({x : a.V}) {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstantDefaultValueFromDeferredLibrary_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const V = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f({x : a.V + 1}) {}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const V = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f({x : a.V + 1}) {}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstCaseExpression() {
-    Source source = addSource(EngineTestCase.createSource([
-        "f(int p, int q) {",
-        "  switch (p) {",
-        "    case 3 + q:",
-        "      break;",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+f(int p, int q) {
+  switch (p) {
+    case 3 + q:
+      break;
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION]);
     verify([source]);
   }
 
   void test_nonConstCaseExpressionFromDeferredLibrary() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "main (int p) {",
-        "  switch (p) {",
-        "    case a.c:",
-        "      break;",
-        "  }",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+main (int p) {
+  switch (p) {
+    case a.c:
+      break;
+  }
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstCaseExpressionFromDeferredLibrary_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "main (int p) {",
-        "  switch (p) {",
-        "    case a.c + 1:",
-        "      break;",
-        "  }",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+main (int p) {
+  switch (p) {
+    case a.c + 1:
+      break;
+  }
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstListElement() {
-    Source source = addSource(EngineTestCase.createSource(["f(a) {", "  return const [a];", "}"]));
+    Source source = addSource(r'''
+f(a) {
+  return const [a];
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT]);
     verify([source]);
   }
 
   void test_nonConstListElementFromDeferredLibrary() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const [a.c];",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const [a.c];
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstListElementFromDeferredLibrary_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const [a.c + 1];",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const [a.c + 1];
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstMapAsExpressionStatement_begin() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  {'a' : 0, 'b' : 1}.length;", "}"]));
+    Source source = addSource(r'''
+f() {
+  {'a' : 0, 'b' : 1}.length;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONST_MAP_AS_EXPRESSION_STATEMENT]);
     verify([source]);
   }
 
   void test_nonConstMapAsExpressionStatement_only() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  {'a' : 0, 'b' : 1};", "}"]));
+    Source source = addSource(r'''
+f() {
+  {'a' : 0, 'b' : 1};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONST_MAP_AS_EXPRESSION_STATEMENT]);
     verify([source]);
   }
 
   void test_nonConstMapKey() {
-    Source source = addSource(EngineTestCase.createSource(["f(a) {", "  return const {a : 0};", "}"]));
+    Source source = addSource(r'''
+f(a) {
+  return const {a : 0};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_MAP_KEY]);
     verify([source]);
   }
 
   void test_nonConstMapKeyFromDeferredLibrary() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const {a.c : 0};",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_KEY_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const {a.c : 0};
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_KEY_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstMapKeyFromDeferredLibrary_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const {a.c + 1 : 0};",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_KEY_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const {a.c + 1 : 0};
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_KEY_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstMapValue() {
-    Source source = addSource(EngineTestCase.createSource(["f(a) {", "  return const {'a' : a};", "}"]));
+    Source source = addSource(r'''
+f(a) {
+  return const {'a' : a};
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE]);
     verify([source]);
   }
 
   void test_nonConstMapValueFromDeferredLibrary() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const {'a' : a.c};",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const {'a' : a.c};
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstMapValueFromDeferredLibrary_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "f() {",
-        "  return const {'a' : a.c + 1};",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+f() {
+  return const {'a' : a.c + 1};
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstValueInInitializer_binary_notBool_left() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final bool a;",
-        "  const A(String p) : a = p && true;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final bool a;
+  const A(String p) : a = p && true;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL,
         StaticTypeWarningCode.NON_BOOL_OPERAND]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_binary_notBool_right() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final bool a;",
-        "  const A(String p) : a = true && p;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final bool a;
+  const A(String p) : a = true && p;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL,
         StaticTypeWarningCode.NON_BOOL_OPERAND]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_binary_notInt() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final int a;",
-        "  const A(String p) : a = 5 & p;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final int a;
+  const A(String p) : a = 5 & p;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_INT,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_binary_notNum() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final int a;",
-        "  const A(String p) : a = 5 + p;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  final int a;
+  const A(String p) : a = 5 + p;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_NUM,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_field() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static int C;",
-        "  final int a;",
-        "  const A() : a = C;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static int C;
+  final int a;
+  const A() : a = C;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_instanceCreation() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A();",
-        "}",
-        "class B {",
-        "  const B() : a = new A();",
-        "  final a;",
-        "}",
-        "var b = const B();"]));
+    Source source = addSource(r'''
+class A {
+  A();
+}
+class B {
+  const B() : a = new A();
+  final a;
+}
+var b = const B();''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_redirecting() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static var C;",
-        "  const A.named(p);",
-        "  const A() : this.named(C);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static var C;
+  const A.named(p);
+  const A() : this.named(C);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializer_super() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A(p);",
-        "}",
-        "class B extends A {",
-        "  static var C;",
-        "  const B() : super(C);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A(p);
+}
+class B extends A {
+  static var C;
+  const B() : super(C);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER]);
     verify([source]);
   }
 
   void test_nonConstValueInInitializerFromDeferredLibrary_field() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class A {",
-        "  final int x;",
-        "  const A() : x = a.c;",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class A {
+  final int x;
+  const A() : x = a.c;
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstValueInInitializerFromDeferredLibrary_field_nested() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class A {",
-        "  final int x;",
-        "  const A() : x = a.c + 1;",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class A {
+  final int x;
+  const A() : x = a.c + 1;
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstValueInInitializerFromDeferredLibrary_redirecting() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class A {",
-        "  const A.named(p);",
-        "  const A() : this.named(a.c);",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class A {
+  const A.named(p);
+  const A() : this.named(a.c);
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonConstValueInInitializerFromDeferredLibrary_super() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "const int c = 1;"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as a;",
-        "class A {",
-        "  const A(p);",
-        "}",
-        "class B extends A {",
-        "  const B() : super(a.c);",
-        "}"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
+        r'''
+library lib1;
+const int c = 1;''',
+        r'''
+library root;
+import 'lib1.dart' deferred as a;
+class A {
+  const A(p);
+}
+class B extends A {
+  const B() : super(a.c);
+}'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY]);
   }
 
   void test_nonGenerativeConstructor_explicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  factory A.named() {}",
-        "}",
-        "class B extends A {",
-        "  B() : super.named();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A.named() {}
+}
+class B extends A {
+  B() : super.named();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_nonGenerativeConstructor_implicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  factory A() {}",
-        "}",
-        "class B extends A {",
-        "  B();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A() {}
+}
+class B extends A {
+  B();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_nonGenerativeConstructor_implicit2() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  factory A() {}",
-        "}",
-        "class B extends A {",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A() {}
+}
+class B extends A {
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NON_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_notEnoughRequiredArguments_const() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A(int p);",
-        "}",
-        "main() {",
-        "  const A();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A(int p);
+}
+main() {
+  const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NOT_ENOUGH_REQUIRED_ARGUMENTS]);
     verify([source]);
   }
 
   void test_notEnoughRequiredArguments_const_super() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A(int p);",
-        "}",
-        "class B extends A {",
-        "  const B() : super();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A(int p);
+}
+class B extends A {
+  const B() : super();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.NOT_ENOUGH_REQUIRED_ARGUMENTS]);
     verify([source]);
   }
 
   void test_optionalParameterInOperator_named() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  operator +({p}) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  operator +({p}) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.OPTIONAL_PARAMETER_IN_OPERATOR]);
     verify([source]);
   }
 
   void test_optionalParameterInOperator_positional() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  operator +([p]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  operator +([p]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.OPTIONAL_PARAMETER_IN_OPERATOR]);
     verify([source]);
   }
 
   void test_partOfNonPart() {
-    Source source = addSource(EngineTestCase.createSource(["library l1;", "part 'l2.dart';"]));
-    addNamedSource("/l2.dart", EngineTestCase.createSource(["library l2;"]));
+    Source source = addSource(r'''
+library l1;
+part 'l2.dart';''');
+    addNamedSource("/l2.dart", "library l2;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PART_OF_NON_PART]);
     verify([source]);
   }
 
   void test_prefixCollidesWithTopLevelMembers_functionTypeAlias() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "class A{}"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "typedef p();", "p.A a;"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+class A{}''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+typedef p();
+p.A a;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER]);
     verify([source]);
   }
 
   void test_prefixCollidesWithTopLevelMembers_topLevelFunction() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "class A{}"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "p() {}", "p.A a;"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+class A{}''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+p() {}
+p.A a;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER]);
     verify([source]);
   }
 
   void test_prefixCollidesWithTopLevelMembers_topLevelVariable() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "class A{}"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "var p = null;", "p.A a;"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+class A{}''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+var p = null;
+p.A a;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER]);
     verify([source]);
   }
 
   void test_prefixCollidesWithTopLevelMembers_type() {
-    addNamedSource("/lib.dart", EngineTestCase.createSource(["library lib;", "class A{}"]));
-    Source source = addSource(EngineTestCase.createSource(["import 'lib.dart' as p;", "class p {}", "p.A a;"]));
+    addNamedSource("/lib.dart", r'''
+library lib;
+class A{}''');
+    Source source = addSource(r'''
+import 'lib.dart' as p;
+class p {}
+p.A a;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER]);
     verify([source]);
   }
 
   void test_privateOptionalParameter() {
-    Source source = addSource(EngineTestCase.createSource(["f({var _p}) {}"]));
+    Source source = addSource("f({var _p}) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER]);
     verify([source]);
   }
 
   void test_privateOptionalParameter_fieldFormal() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  var _p;", "  A({this._p: 0});", "}"]));
+    Source source = addSource(r'''
+class A {
+  var _p;
+  A({this._p: 0});
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER]);
     verify([source]);
   }
 
   void test_privateOptionalParameter_withDefaultValue() {
-    Source source = addSource(EngineTestCase.createSource(["f({_p : 0}) {}"]));
+    Source source = addSource("f({_p : 0}) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.PRIVATE_OPTIONAL_PARAMETER]);
     verify([source]);
   }
 
   void test_recursiveConstructorRedirect() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A.a() : this.b();",
-        "  A.b() : this.a();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A.a() : this.b();
+  A.b() : this.a();
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_CONSTRUCTOR_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_CONSTRUCTOR_REDIRECT]);
     verify([source]);
   }
 
   void test_recursiveConstructorRedirect_directSelfReference() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() : this();", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() : this();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_CONSTRUCTOR_REDIRECT]);
     verify([source]);
   }
 
   void test_recursiveFactoryRedirect() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A implements B {",
-        "  factory A() = C;",
-        "}",
-        "class B implements C {",
-        "  factory B() = A;",
-        "}",
-        "class C implements A {",
-        "  factory C() = B;",
-        "}"]));
+    Source source = addSource(r'''
+class A implements B {
+  factory A() = C;
+}
+class B implements C {
+  factory B() = A;
+}
+class C implements A {
+  factory C() = B;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveFactoryRedirect_directSelfReference() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  factory A() = A;", "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A() = A;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT]);
     verify([source]);
   }
 
   void test_recursiveFactoryRedirect_generic() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A<T> implements B<T> {",
-        "  factory A() = C;",
-        "}",
-        "class B<T> implements C<T> {",
-        "  factory B() = A;",
-        "}",
-        "class C<T> implements A<T> {",
-        "  factory C() = B;",
-        "}"]));
+    Source source = addSource(r'''
+class A<T> implements B<T> {
+  factory A() = C;
+}
+class B<T> implements C<T> {
+  factory B() = A;
+}
+class C<T> implements A<T> {
+  factory C() = B;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveFactoryRedirect_named() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A implements B {",
-        "  factory A.nameA() = C.nameC;",
-        "}",
-        "class B implements C {",
-        "  factory B.nameB() = A.nameA;",
-        "}",
-        "class C implements A {",
-        "  factory C.nameC() = B.nameB;",
-        "}"]));
+    Source source = addSource(r'''
+class A implements B {
+  factory A.nameA() = C.nameC;
+}
+class B implements C {
+  factory B.nameB() = A.nameA;
+}
+class C implements A {
+  factory C.nameC() = B.nameB;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   /**
    * "A" references "C" which has cycle with "B". But we should not report problem for "A" - it is
    * not the part of a cycle.
    */
   void test_recursiveFactoryRedirect_outsideCycle() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  factory A() = C;",
-        "}",
-        "class B implements C {",
-        "  factory B() = C;",
-        "}",
-        "class C implements A, B {",
-        "  factory C() = B;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  factory A() = C;
+}
+class B implements C {
+  factory B() = C;
+}
+class C implements A, B {
+  factory C() = B;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_FACTORY_REDIRECT,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_extends() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends B {}", "class B extends A {}"]));
+    Source source = addSource(r'''
+class A extends B {}
+class B extends A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_extends_implements() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends B {}", "class B implements A {}"]));
+    Source source = addSource(r'''
+class A extends B {}
+class B implements A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_implements() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements B {}", "class B implements A {}"]));
+    Source source = addSource(r'''
+class A implements B {}
+class B implements A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_mixin() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class M1 = Object with M2;",
-        "class M2 = Object with M1;"]));
+    Source source = addSource(r'''
+class M1 = Object with M2;
+class M2 = Object with M1;''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_tail() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A implements A {}",
-        "class B implements A {}"]));
+    Source source = addSource(r'''
+abstract class A implements A {}
+class B implements A {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE_BASE_CASE_IMPLEMENTS]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_tail2() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A implements B {}",
-        "abstract class B implements A {}",
-        "class C implements A {}"]));
+    Source source = addSource(r'''
+abstract class A implements B {}
+abstract class B implements A {}
+class C implements A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritance_tail3() {
-    Source source = addSource(EngineTestCase.createSource([
-        "abstract class A implements B {}",
-        "abstract class B implements C {}",
-        "abstract class C implements A {}",
-        "class D implements A {}"]));
+    Source source = addSource(r'''
+abstract class A implements B {}
+abstract class B implements C {}
+abstract class C implements A {}
+class D implements A {}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
         CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritanceBaseCaseExtends() {
-    Source source = addSource(EngineTestCase.createSource(["class A extends A {}"]));
+    Source source = addSource("class A extends A {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE_BASE_CASE_EXTENDS]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritanceBaseCaseImplements() {
-    Source source = addSource(EngineTestCase.createSource(["class A implements A {}"]));
+    Source source = addSource("class A implements A {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE_BASE_CASE_IMPLEMENTS]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritanceBaseCaseImplements_typeAlias() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class M {}",
-        "class B = A with M implements B;"]));
+    Source source = addSource(r'''
+class A {}
+class M {}
+class B = A with M implements B;''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE_BASE_CASE_IMPLEMENTS]);
     verify([source]);
   }
 
   void test_recursiveInterfaceInheritanceBaseCaseWith() {
-    Source source = addSource(EngineTestCase.createSource(["class M = Object with M;"]));
+    Source source = addSource("class M = Object with M;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE_BASE_CASE_WITH]);
     verify([source]);
   }
 
   void test_redirectGenerativeToMissingConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() : this.noSuchConstructor();", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() : this.noSuchConstructor();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_GENERATIVE_TO_MISSING_CONSTRUCTOR]);
   }
 
   void test_redirectGenerativeToNonGenerativeConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A() : this.x();",
-        "  factory A.x() => null;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A() : this.x();
+  factory A.x() => null;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_GENERATIVE_TO_NON_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_redirectToMissingConstructor_named() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A implements B{",
-        "  A() {}",
-        "}",
-        "class B {",
-        "  const factory B() = A.name;",
-        "}"]));
+    Source source = addSource(r'''
+class A implements B{
+  A() {}
+}
+class B {
+  const factory B() = A.name;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_TO_MISSING_CONSTRUCTOR]);
   }
 
   void test_redirectToMissingConstructor_unnamed() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A implements B{",
-        "  A.name() {}",
-        "}",
-        "class B {",
-        "  const factory B() = A;",
-        "}"]));
+    Source source = addSource(r'''
+class A implements B{
+  A.name() {}
+}
+class B {
+  const factory B() = A;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_TO_MISSING_CONSTRUCTOR]);
   }
 
   void test_redirectToNonClass_notAType() {
-    Source source = addSource(EngineTestCase.createSource(["int A;", "class B {", "  const factory B() = A;", "}"]));
+    Source source = addSource(r'''
+int A;
+class B {
+  const factory B() = A;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_TO_NON_CLASS]);
     verify([source]);
   }
 
   void test_redirectToNonClass_undefinedIdentifier() {
-    Source source = addSource(EngineTestCase.createSource(["class B {", "  const factory B() = A;", "}"]));
+    Source source = addSource(r'''
+class B {
+  const factory B() = A;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_TO_NON_CLASS]);
     verify([source]);
   }
 
   void test_redirectToNonConstConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A.a() {}",
-        "  const factory A.b() = A.a;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A.a() {}
+  const factory A.b() = A.a;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REDIRECT_TO_NON_CONST_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_referencedBeforeDeclaration_hideInBlock_function() {
-    Source source = addSource(EngineTestCase.createSource([
-        "var v = 1;",
-        "main() {",
-        "  print(v);",
-        "  v() {}",
-        "}",
-        "print(x) {}"]));
+    Source source = addSource(r'''
+var v = 1;
+main() {
+  print(v);
+  v() {}
+}
+print(x) {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION]);
   }
 
   void test_referencedBeforeDeclaration_hideInBlock_local() {
-    Source source = addSource(EngineTestCase.createSource([
-        "var v = 1;",
-        "main() {",
-        "  print(v);",
-        "  var v = 2;",
-        "}",
-        "print(x) {}"]));
+    Source source = addSource(r'''
+var v = 1;
+main() {
+  print(v);
+  var v = 2;
+}
+print(x) {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION]);
   }
 
   void test_referencedBeforeDeclaration_hideInBlock_subBlock() {
-    Source source = addSource(EngineTestCase.createSource([
-        "var v = 1;",
-        "main() {",
-        "  {",
-        "    print(v);",
-        "  }",
-        "  var v = 2;",
-        "}",
-        "print(x) {}"]));
+    Source source = addSource(r'''
+var v = 1;
+main() {
+  {
+    print(v);
+  }
+  var v = 2;
+}
+print(x) {}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION]);
   }
 
   void test_referencedBeforeDeclaration_inInitializer_closure() {
-    Source source = addSource(EngineTestCase.createSource(["main() {", "  var v = () => v;", "}"]));
+    Source source = addSource(r'''
+main() {
+  var v = () => v;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION]);
   }
 
   void test_referencedBeforeDeclaration_inInitializer_directly() {
-    Source source = addSource(EngineTestCase.createSource(["main() {", "  var v = v;", "}"]));
+    Source source = addSource(r'''
+main() {
+  var v = v;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION]);
   }
 
   void test_rethrowOutsideCatch() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  rethrow;", "}"]));
+    Source source = addSource(r'''
+f() {
+  rethrow;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RETHROW_OUTSIDE_CATCH]);
     verify([source]);
   }
 
   void test_returnInGenerativeConstructor() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() { return 0; }", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() { return 0; }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RETURN_IN_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_returnInGenerativeConstructor_expressionFunctionBody() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  A() => null;", "}"]));
+    Source source = addSource(r'''
+class A {
+  A() => null;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RETURN_IN_GENERATIVE_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_returnInGenerator_asyncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() async* {", "  return 0;", "}"]));
+    Source source = addSource(r'''
+f() async* {
+  return 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RETURN_IN_GENERATOR]);
     verify([source]);
   }
 
   void test_returnInGenerator_syncStar() {
     resetWithAsync();
-    Source source = addSource(EngineTestCase.createSource(["f() sync* {", "  return 0;", "}"]));
+    Source source = addSource(r'''
+f() sync* {
+  return 0;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.RETURN_IN_GENERATOR]);
     verify([source]);
   }
 
   void test_sharedDeferredPrefix() {
     resolveWithAndWithoutExperimental(<String> [
-        EngineTestCase.createSource(["library lib1;", "f1() {}"]),
-        EngineTestCase.createSource(["library lib2;", "f2() {}"]),
-        EngineTestCase.createSource([
-        "library root;",
-        "import 'lib1.dart' deferred as lib;",
-        "import 'lib2.dart' as lib;",
-        "main() { lib.f1(); lib.f2(); }"])], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.SHARED_DEFERRED_PREFIX]);
+        r'''
+library lib1;
+f1() {}''',
+        r'''
+library lib2;
+f2() {}''',
+        r'''
+library root;
+import 'lib1.dart' deferred as lib;
+import 'lib2.dart' as lib;
+main() { lib.f1(); lib.f2(); }'''], <ErrorCode> [ParserErrorCode.DEFERRED_IMPORTS_NOT_SUPPORTED], <ErrorCode> [CompileTimeErrorCode.SHARED_DEFERRED_PREFIX]);
   }
 
   void test_superInInvalidContext_binaryExpression() {
-    Source source = addSource(EngineTestCase.createSource(["var v = super + 0;"]));
+    Source source = addSource("var v = super + 0;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.v' is not resolved
   }
 
   void test_superInInvalidContext_constructorFieldInitializer() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "}",
-        "class B extends A {",
-        "  var f;",
-        "  B() : f = super.m();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+}
+class B extends A {
+  var f;
+  B() : f = super.m();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.m' is not resolved
   }
 
   void test_superInInvalidContext_factoryConstructor() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  m() {}",
-        "}",
-        "class B extends A {",
-        "  factory B() {",
-        "    super.m();",
-        "  }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  m() {}
+}
+class B extends A {
+  factory B() {
+    super.m();
+  }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.m' is not resolved
   }
 
   void test_superInInvalidContext_instanceVariableInitializer() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  var a;",
-        "}",
-        "class B extends A {",
-        " var b = super.a;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  var a;
+}
+class B extends A {
+ var b = super.a;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.a' is not resolved
   }
 
   void test_superInInvalidContext_staticMethod() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static m() {}",
-        "}",
-        "class B extends A {",
-        "  static n() { return super.m(); }",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static m() {}
+}
+class B extends A {
+  static n() { return super.m(); }
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.m' is not resolved
   }
 
   void test_superInInvalidContext_staticVariableInitializer() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  static int a = 0;",
-        "}",
-        "class B extends A {",
-        "  static int b = super.a;",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  static int a = 0;
+}
+class B extends A {
+  static int b = super.a;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.a' is not resolved
   }
 
   void test_superInInvalidContext_topLevelFunction() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  super.f();", "}"]));
+    Source source = addSource(r'''
+f() {
+  super.f();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.f' is not resolved
   }
 
   void test_superInInvalidContext_topLevelVariableInitializer() {
-    Source source = addSource(EngineTestCase.createSource(["var v = super.y;"]));
+    Source source = addSource("var v = super.y;");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_INVALID_CONTEXT]);
     // no verify(), 'super.y' is not resolved
   }
 
   void test_superInRedirectingConstructor_redirectionSuper() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B {",
-        "  B() : this.name(), super();",
-        "  B.name() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class B {
+  B() : this.name(), super();
+  B.name() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_REDIRECTING_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_superInRedirectingConstructor_superRedirection() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B {",
-        "  B() : super(), this.name();",
-        "  B.name() {}",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class B {
+  B() : super(), this.name();
+  B.name() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.SUPER_IN_REDIRECTING_CONSTRUCTOR]);
     verify([source]);
   }
 
   void test_symbol_constructor_badArgs() {
-    Source source = addSource(EngineTestCase.createSource([
-        "var s1 = const Symbol('3');",
-        "var s2 = const Symbol(3);",
-        "var s3 = const Symbol();",
-        "var s4 = const Symbol('x', 'y');",
-        "var s5 = const Symbol('x', foo: 'x');"]));
+    Source source = addSource(r'''
+var s1 = const Symbol('3');
+var s2 = const Symbol(3);
+var s3 = const Symbol();
+var s4 = const Symbol('x', 'y');
+var s5 = const Symbol('x', foo: 'x');''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION,
         CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE,
         CompileTimeErrorCode.NOT_ENOUGH_REQUIRED_ARGUMENTS,
         CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS,
         CompileTimeErrorCode.UNDEFINED_NAMED_PARAMETER]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_11987() {
-    Source source = addSource(EngineTestCase.createSource([
-        "typedef void F(List<G> l);",
-        "typedef void G(List<F> l);",
-        "main() {",
-        "  F foo(G g) => g;",
-        "}"]));
+    Source source = addSource(r'''
+typedef void F(List<G> l);
+typedef void G(List<F> l);
+main() {
+  F foo(G g) => g;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF,
         CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF,
         StaticTypeWarningCode.RETURN_OF_INVALID_TYPE]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_parameterType_named() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A({A a});"]));
+    Source source = addSource("typedef A({A a});");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_parameterType_positional() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A([A a]);"]));
+    Source source = addSource("typedef A([A a]);");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_parameterType_required() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A(A a);"]));
+    Source source = addSource("typedef A(A a);");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_parameterType_typeArgument() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A(List<A> a);"]));
+    Source source = addSource("typedef A(List<A> a);");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_returnClass_withTypeAlias() {
-    Source source = addSource(EngineTestCase.createSource([
-        "typedef C A();",
-        "typedef A B();",
-        "class C {",
-        "  B a;",
-        "}"]));
+    Source source = addSource(r'''
+typedef C A();
+typedef A B();
+class C {
+  B a;
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_returnType() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A A();"]));
+    Source source = addSource("typedef A A();");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_returnType_indirect() {
-    Source source = addSource(EngineTestCase.createSource(["typedef B A();", "typedef A B();"]));
+    Source source = addSource(r'''
+typedef B A();
+typedef A B();''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF,
         CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeAliasCannotReferenceItself_typeVariableBounds() {
-    Source source = addSource(EngineTestCase.createSource(["typedef A<T extends A>();"]));
+    Source source = addSource("typedef A<T extends A>();");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ALIAS_CANNOT_REFERENCE_ITSELF]);
     verify([source]);
   }
 
   void test_typeArgumentNotMatchingBounds_const() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B {}",
-        "class G<E extends A> {",
-        "  const G();",
-        "}",
-        "f() { return const G<B>(); }"]));
+    Source source = addSource(r'''
+class A {}
+class B {}
+class G<E extends A> {
+  const G();
+}
+f() { return const G<B>(); }''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS]);
     verify([source]);
   }
 
   void test_undefinedClass_const() {
-    Source source = addSource(EngineTestCase.createSource(["f() {", "  return const A();", "}"]));
+    Source source = addSource(r'''
+f() {
+  return const A();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.UNDEFINED_CLASS]);
     verify([source]);
   }
 
   void test_undefinedConstructorInInitializer_explicit_named() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {}",
-        "class B extends A {",
-        "  B() : super.named();",
-        "}"]));
+    Source source = addSource(r'''
+class A {}
+class B extends A {
+  B() : super.named();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.UNDEFINED_CONSTRUCTOR_IN_INITIALIZER]);
     // no verify(), "super.named()" is not resolved
   }
 
   void test_undefinedConstructorInInitializer_explicit_unnamed() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A.named() {}",
-        "}",
-        "class B extends A {",
-        "  B() : super();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A.named() {}
+}
+class B extends A {
+  B() : super();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.UNDEFINED_CONSTRUCTOR_IN_INITIALIZER_DEFAULT]);
     verify([source]);
   }
 
   void test_undefinedConstructorInInitializer_implicit() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  A.named() {}",
-        "}",
-        "class B extends A {",
-        "  B();",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  A.named() {}
+}
+class B extends A {
+  B();
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.UNDEFINED_CONSTRUCTOR_IN_INITIALIZER_DEFAULT]);
     verify([source]);
   }
 
   void test_undefinedNamedParameter() {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  const A();",
-        "}",
-        "main() {",
-        "  const A(p: 0);",
-        "}"]));
+    Source source = addSource(r'''
+class A {
+  const A();
+}
+main() {
+  const A(p: 0);
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.UNDEFINED_NAMED_PARAMETER]);
     // no verify(), 'p' is not resolved
   }
 
   void test_uriDoesNotExist_export() {
-    Source source = addSource(EngineTestCase.createSource(["export 'unknown.dart';"]));
+    Source source = addSource("export 'unknown.dart';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriDoesNotExist_import() {
-    Source source = addSource(EngineTestCase.createSource(["import 'unknown.dart';"]));
+    Source source = addSource("import 'unknown.dart';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriDoesNotExist_part() {
-    Source source = addSource(EngineTestCase.createSource(["part 'unknown.dart';"]));
+    Source source = addSource("part 'unknown.dart';");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriWithInterpolation_constant() {
-    Source source = addSource(EngineTestCase.createSource(["import 'stuff_\$platform.dart';"]));
+    Source source = addSource("import 'stuff_\$platform.dart';");
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.URI_WITH_INTERPOLATION,
         StaticWarningCode.UNDEFINED_IDENTIFIER]);
     // We cannot verify resolution with an unresolvable URI: 'stuff_$platform.dart'
   }
 
   void test_uriWithInterpolation_nonConstant() {
-    Source source = addSource(EngineTestCase.createSource(["library lib;", "part '\${'a'}.dart';"]));
+    Source source = addSource(r'''
+library lib;
+part '${'a'}.dart';''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.URI_WITH_INTERPOLATION]);
     // We cannot verify resolution with an unresolvable URI: '${'a'}.dart'
   }
 
   void test_wrongNumberOfParametersForOperator_minus() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  operator -(a, b) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  operator -(a, b) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_OPERATOR_MINUS]);
     verify([source]);
     reset();
   }
 
   void test_wrongNumberOfParametersForOperator_tilde() {
     _check_wrongNumberOfParametersForOperator("~", "a");
     _check_wrongNumberOfParametersForOperator("~", "a, b");
   }
@@ skipping 38 matching lines @@
   }
 
   void test_wrongNumberOfParametersForSetter_function_tooMany() {
     Source source = addSource("set x(a, b) {}");
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER]);
     verify([source]);
   }
 
   void test_wrongNumberOfParametersForSetter_method_named() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x({p}) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x({p}) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER]);
     verify([source]);
   }
 
   void test_wrongNumberOfParametersForSetter_method_optional() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x([p]) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x([p]) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER]);
     verify([source]);
   }
 
   void test_wrongNumberOfParametersForSetter_method_tooFew() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x() {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x() {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER]);
     verify([source]);
   }
 
   void test_wrongNumberOfParametersForSetter_method_tooMany() {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  set x(a, b) {}", "}"]));
+    Source source = addSource(r'''
+class A {
+  set x(a, b) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_SETTER]);
     verify([source]);
   }
 
   void _check_constEvalThrowsException_binary_null(String expr, bool resolved) {
     Source source = addSource("const C = ${expr};");
     resolve(source);
     if (resolved) {
       assertErrors(source, [CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION]);
       verify([source]);
     } else {
       assertErrors(source, [CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION]);
       // no verify(), 'null x' is not resolved
     }
     reset();
   }
 
   void _check_constEvalTypeBool_withParameter_binary(String expr) {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final a;",
-        "  const A(bool p) : a = ${expr};",
-        "}"]));
+    Source source = addSource('''
+class A {
+  final a;
+  const A(bool p) : a = $expr;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL,
         StaticTypeWarningCode.NON_BOOL_OPERAND]);
     verify([source]);
     reset();
   }
 
   void _check_constEvalTypeInt_withParameter_binary(String expr) {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final a;",
-        "  const A(int p) : a = ${expr};",
-        "}"]));
+    Source source = addSource('''
+class A {
+  final a;
+  const A(int p) : a = $expr;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_INT,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
     reset();
   }
 
   void _check_constEvalTypeNum_withParameter_binary(String expr) {
-    Source source = addSource(EngineTestCase.createSource([
-        "class A {",
-        "  final a;",
-        "  const A(num p) : a = ${expr};",
-        "}"]));
+    Source source = addSource('''
+class A {
+  final a;
+  const A(num p) : a = $expr;
+}''');
     resolve(source);
     assertErrors(source, [
         CompileTimeErrorCode.CONST_EVAL_TYPE_NUM,
         StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]);
     verify([source]);
     reset();
   }
 
   void _check_wrongNumberOfParametersForOperator(String name, String parameters) {
-    Source source = addSource(EngineTestCase.createSource(["class A {", "  operator ${name}(${parameters}) {}", "}"]));
+    Source source = addSource('''
+class A {
+  operator $name($parameters) {}
+}''');
     resolve(source);
     assertErrors(source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_OPERATOR]);
     verify([source]);
     reset();
   }
 
   void _check_wrongNumberOfParametersForOperator1(String name) {
     _check_wrongNumberOfParametersForOperator(name, "");
     _check_wrongNumberOfParametersForOperator(name, "a, b");
   }
 }
 
 main() {
   _ut.groupSep = ' | ';
   runReflectiveTests(CompileTimeErrorCodeTest);
 }