Move constant implementation out of generated

pkg/analyzer/test/generated/constant_test.dart

 // Copyright (c) 2016, 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 analyzer.test.constant_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/ast/token.dart';
-import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/constant.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/error.dart';
-import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
-import 'package:analyzer/src/generated/testing/ast_factory.dart';
-import 'package:analyzer/src/generated/testing/element_factory.dart';
-import 'package:analyzer/src/generated/testing/test_type_provider.dart';
-import 'package:analyzer/src/generated/utilities_collection.dart';
-import 'package:analyzer/src/task/dart.dart';
-import 'package:path/path.dart';
 import 'package:unittest/unittest.dart';
 
 import '../reflective_tests.dart';
 import '../utils.dart';
-import 'engine_test.dart';
 import 'resolver_test_case.dart';
 import 'test_support.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(ConstantEvaluatorTest);
-  runReflectiveTests(ConstantFinderTest);
-  runReflectiveTests(ConstantValueComputerTest);
-  runReflectiveTests(ConstantVisitorTest);
-  runReflectiveTests(DartObjectImplTest);
-  runReflectiveTests(DeclaredVariablesTest);
-  runReflectiveTests(ReferenceFinderTest);
-}
-
-const int LONG_MAX_VALUE = 0x7fffffffffffffff;
-
-/**
- * Implementation of [ConstantEvaluationValidator] used during unit tests;
- * verifies that any nodes referenced during constant evaluation are present in
- * the dependency graph.
- */
-class ConstantEvaluationValidator_ForTest
-    implements ConstantEvaluationValidator {
-  final InternalAnalysisContext context;
-  ConstantValueComputer computer;
-  ConstantEvaluationTarget _nodeBeingEvaluated;
-
-  ConstantEvaluationValidator_ForTest(this.context);
-
-  @override
-  void beforeComputeValue(ConstantEvaluationTarget constant) {
-    _nodeBeingEvaluated = constant;
-  }
-
-  @override
-  void beforeGetConstantInitializers(ConstructorElement constructor) =>
-      _checkPathTo(constructor);
-
-  @override
-  void beforeGetEvaluationResult(ConstantEvaluationTarget constant) =>
-      _checkPathTo(constant);
-
-  @override
-  void beforeGetFieldEvaluationResult(FieldElementImpl field) =>
-      _checkPathTo(field);
-
-  @override
-  void beforeGetParameterDefault(ParameterElement parameter) =>
-      _checkPathTo(parameter);
-
-  void _checkPathTo(ConstantEvaluationTarget target) {
-    if (computer.referenceGraph.containsPath(_nodeBeingEvaluated, target)) {
-      return; // pass
-    }
-    // print a nice error message on failure
-    StringBuffer out = new StringBuffer();
-    out.writeln("missing path in constant dependency graph");
-    out.writeln("from $_nodeBeingEvaluated to $target");
-    for (var s in context.analysisCache.sources) {
-      String text = context.getContents(s).data;
-      if (text != "") {
-        out.writeln('''
-=== ${s.shortName}
-$text''');
-      }
-    }
-    fail(out.toString());
-  }
 }
 
 @reflectiveTest
 class ConstantEvaluatorTest extends ResolverTestCase {
   void fail_constructor() {
     EvaluationResult result = _getExpressionValue("?");
     expect(result.isValid, isTrue);
     DartObject value = result.value;
     expect(value, null);
   }
@@ skipping 367 matching lines @@
         TopLevelVariableDeclaration, declaration);
     NodeList<VariableDeclaration> variables =
         (declaration as TopLevelVariableDeclaration).variables.variables;
     expect(variables, hasLength(1));
     ConstantEvaluator evaluator = new ConstantEvaluator(
         source, analysisContext.typeProvider,
         typeSystem: analysisContext.typeSystem);
     return evaluator.evaluate(variables[0].initializer);
   }
 }
-
-@reflectiveTest
-class ConstantFinderTest {
-  AstNode _node;
-  TypeProvider _typeProvider;
-  AnalysisContext _context;
-  Source _source;
-
-  void setUp() {
-    _typeProvider = new TestTypeProvider();
-    _context = new _TestAnalysisContext();
-    _source = new TestSource();
-  }
-
-  /**
-   * Test an annotation that consists solely of an identifier (and hence
-   * represents a reference to a compile-time constant variable).
-   */
-  void test_visitAnnotation_constantVariable() {
-    CompilationUnitElement compilationUnitElement =
-        ElementFactory.compilationUnit('/test.dart', _source)..source = _source;
-    ElementFactory.library(_context, 'L').definingCompilationUnit =
-        compilationUnitElement;
-    ElementAnnotationImpl elementAnnotation =
-        new ElementAnnotationImpl(compilationUnitElement);
-    _node = elementAnnotation.annotationAst = AstFactory.annotation(
-        AstFactory.identifier3('x'))..elementAnnotation = elementAnnotation;
-    expect(_findAnnotations(), contains(_node));
-  }
-
-  /**
-   * Test an annotation that represents the invocation of a constant
-   * constructor.
-   */
-  void test_visitAnnotation_invocation() {
-    CompilationUnitElement compilationUnitElement =
-        ElementFactory.compilationUnit('/test.dart', _source)..source = _source;
-    ElementFactory.library(_context, 'L').definingCompilationUnit =
-        compilationUnitElement;
-    ElementAnnotationImpl elementAnnotation =
-        new ElementAnnotationImpl(compilationUnitElement);
-    _node = elementAnnotation.annotationAst = AstFactory.annotation2(
-        AstFactory.identifier3('A'), null, AstFactory.argumentList())
-      ..elementAnnotation = elementAnnotation;
-    expect(_findAnnotations(), contains(_node));
-  }
-
-  void test_visitAnnotation_partOf() {
-    // Analyzer ignores annotations on "part of" directives.
-    Annotation annotation = AstFactory.annotation2(
-        AstFactory.identifier3('A'), null, AstFactory.argumentList());
-    _node = AstFactory.partOfDirective2(
-        <Annotation>[annotation], AstFactory.libraryIdentifier2(<String>['L']));
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitConstructorDeclaration_const() {
-    ConstructorElement element = _setupConstructorDeclaration("A", true);
-    expect(_findConstants(), contains(element));
-  }
-
-  void test_visitConstructorDeclaration_nonConst() {
-    _setupConstructorDeclaration("A", false);
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitVariableDeclaration_const() {
-    VariableElement element = _setupVariableDeclaration("v", true, true);
-    expect(_findConstants(), contains(element));
-  }
-
-  void test_visitVariableDeclaration_final_inClass() {
-    _setupFieldDeclaration('C', 'f', Keyword.FINAL);
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitVariableDeclaration_final_inClassWithConstConstructor() {
-    VariableDeclaration field = _setupFieldDeclaration('C', 'f', Keyword.FINAL,
-        hasConstConstructor: true);
-    expect(_findConstants(), contains(field.element));
-  }
-
-  void test_visitVariableDeclaration_final_outsideClass() {
-    _setupVariableDeclaration('v', false, true, isFinal: true);
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitVariableDeclaration_noInitializer() {
-    _setupVariableDeclaration("v", true, false);
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitVariableDeclaration_nonConst() {
-    _setupVariableDeclaration("v", false, true);
-    expect(_findConstants(), isEmpty);
-  }
-
-  void test_visitVariableDeclaration_static_const_inClass() {
-    VariableDeclaration field =
-        _setupFieldDeclaration('C', 'f', Keyword.CONST, isStatic: true);
-    expect(_findConstants(), contains(field.element));
-  }
-
-  void
-      test_visitVariableDeclaration_static_const_inClassWithConstConstructor() {
-    VariableDeclaration field = _setupFieldDeclaration('C', 'f', Keyword.CONST,
-        isStatic: true, hasConstConstructor: true);
-    expect(_findConstants(), contains(field.element));
-  }
-
-  void
-      test_visitVariableDeclaration_static_final_inClassWithConstConstructor() {
-    VariableDeclaration field = _setupFieldDeclaration('C', 'f', Keyword.FINAL,
-        isStatic: true, hasConstConstructor: true);
-    expect(_findConstants(), isNot(contains(field.element)));
-  }
-
-  void
-      test_visitVariableDeclaration_uninitialized_final_inClassWithConstConstructor() {
-    VariableDeclaration field = _setupFieldDeclaration('C', 'f', Keyword.FINAL,
-        isInitialized: false, hasConstConstructor: true);
-    expect(_findConstants(), isNot(contains(field.element)));
-  }
-
-  void test_visitVariableDeclaration_uninitialized_static_const_inClass() {
-    _setupFieldDeclaration('C', 'f', Keyword.CONST,
-        isStatic: true, isInitialized: false);
-    expect(_findConstants(), isEmpty);
-  }
-
-  List<Annotation> _findAnnotations() {
-    Set<Annotation> annotations = new Set<Annotation>();
-    for (ConstantEvaluationTarget target in _findConstants()) {
-      if (target is ElementAnnotationImpl) {
-        expect(target.context, same(_context));
-        expect(target.source, same(_source));
-        annotations.add(target.annotationAst);
-      }
-    }
-    return new List<Annotation>.from(annotations);
-  }
-
-  List<ConstantEvaluationTarget> _findConstants() {
-    ConstantFinder finder = new ConstantFinder(_context, _source, _source);
-    _node.accept(finder);
-    List<ConstantEvaluationTarget> constants = finder.constantsToCompute;
-    expect(constants, isNotNull);
-    return constants;
-  }
-
-  ConstructorElement _setupConstructorDeclaration(String name, bool isConst) {
-    Keyword constKeyword = isConst ? Keyword.CONST : null;
-    ConstructorDeclaration constructorDeclaration =
-        AstFactory.constructorDeclaration2(
-            constKeyword,
-            null,
-            null,
-            name,
-            AstFactory.formalParameterList(),
-            null,
-            AstFactory.blockFunctionBody2());
-    ClassElement classElement = ElementFactory.classElement2(name);
-    ConstructorElement element =
-        ElementFactory.constructorElement(classElement, name, isConst);
-    constructorDeclaration.element = element;
-    _node = constructorDeclaration;
-    return element;
-  }
-
-  VariableDeclaration _setupFieldDeclaration(
-      String className, String fieldName, Keyword keyword,
-      {bool isInitialized: true,
-      bool isStatic: false,
-      bool hasConstConstructor: false}) {
-    VariableDeclaration variableDeclaration = isInitialized
-        ? AstFactory.variableDeclaration2(fieldName, AstFactory.integer(0))
-        : AstFactory.variableDeclaration(fieldName);
-    VariableElement fieldElement = ElementFactory.fieldElement(
-        fieldName,
-        isStatic,
-        keyword == Keyword.FINAL,
-        keyword == Keyword.CONST,
-        _typeProvider.intType);
-    variableDeclaration.name.staticElement = fieldElement;
-    FieldDeclaration fieldDeclaration = AstFactory.fieldDeclaration2(
-        isStatic, keyword, <VariableDeclaration>[variableDeclaration]);
-    ClassDeclaration classDeclaration =
-        AstFactory.classDeclaration(null, className, null, null, null, null);
-    classDeclaration.members.add(fieldDeclaration);
-    _node = classDeclaration;
-    ClassElementImpl classElement = ElementFactory.classElement2(className);
-    classElement.fields = <FieldElement>[fieldElement];
-    classDeclaration.name.staticElement = classElement;
-    if (hasConstConstructor) {
-      ConstructorDeclaration constructorDeclaration =
-          AstFactory.constructorDeclaration2(
-              Keyword.CONST,
-              null,
-              AstFactory.identifier3(className),
-              null,
-              AstFactory.formalParameterList(),
-              null,
-              AstFactory.blockFunctionBody2());
-      classDeclaration.members.add(constructorDeclaration);
-      ConstructorElement constructorElement =
-          ElementFactory.constructorElement(classElement, '', true);
-      constructorDeclaration.element = constructorElement;
-      classElement.constructors = <ConstructorElement>[constructorElement];
-    } else {
-      classElement.constructors = ConstructorElement.EMPTY_LIST;
-    }
-    return variableDeclaration;
-  }
-
-  VariableElement _setupVariableDeclaration(
-      String name, bool isConst, bool isInitialized,
-      {isFinal: false}) {
-    VariableDeclaration variableDeclaration = isInitialized
-        ? AstFactory.variableDeclaration2(name, AstFactory.integer(0))
-        : AstFactory.variableDeclaration(name);
-    SimpleIdentifier identifier = variableDeclaration.name;
-    VariableElement element = ElementFactory.localVariableElement(identifier);
-    identifier.staticElement = element;
-    Keyword keyword = isConst ? Keyword.CONST : isFinal ? Keyword.FINAL : null;
-    AstFactory.variableDeclarationList2(keyword, [variableDeclaration]);
-    _node = variableDeclaration;
-    return element;
-  }
-}
-
-@reflectiveTest
-class ConstantValueComputerTest extends ResolverTestCase {
-  void test_annotation_constConstructor() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  final int i;
-  const A(this.i);
-}
-
-class C {
-  @A(5)
-  f() {}
-}
-''');
-    EvaluationResultImpl result =
-        _evaluateAnnotation(compilationUnit, "C", "f");
-    Map<String, DartObjectImpl> annotationFields = _assertType(result, 'A');
-    _assertIntField(annotationFields, 'i', 5);
-  }
-
-  void test_annotation_constConstructor_named() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  final int i;
-  const A.named(this.i);
-}
-
-class C {
-  @A.named(5)
-  f() {}
-}
-''');
-    EvaluationResultImpl result =
-        _evaluateAnnotation(compilationUnit, "C", "f");
-    Map<String, DartObjectImpl> annotationFields = _assertType(result, 'A');
-    _assertIntField(annotationFields, 'i', 5);
-  }
-
-  void test_annotation_constConstructor_noArgs() {
-    // Failing to pass arguments to an annotation which is a constant
-    // constructor is illegal, but shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  final int i;
-  const A(this.i);
-}
-
-class C {
-  @A
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_annotation_constConstructor_noArgs_named() {
-    // Failing to pass arguments to an annotation which is a constant
-    // constructor is illegal, but shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  final int i;
-  const A.named(this.i);
-}
-
-class C {
-  @A.named
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_annotation_nonConstConstructor() {
-    // Calling a non-const constructor from an annotation that is illegal, but
-    // shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  final int i;
-  A(this.i);
-}
-
-class C {
-  @A(5)
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_annotation_staticConst() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class C {
-  static const int i = 5;
-
-  @i
-  f() {}
-}
-''');
-    EvaluationResultImpl result =
-        _evaluateAnnotation(compilationUnit, "C", "f");
-    expect(_assertValidInt(result), 5);
-  }
-
-  void test_annotation_staticConst_args() {
-    // Applying arguments to an annotation that is a static const is
-    // illegal, but shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class C {
-  static const int i = 5;
-
-  @i(1)
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_annotation_staticConst_otherClass() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  static const int i = 5;
-}
-
-class C {
-  @A.i
-  f() {}
-}
-''');
-    EvaluationResultImpl result =
-        _evaluateAnnotation(compilationUnit, "C", "f");
-    expect(_assertValidInt(result), 5);
-  }
-
-  void test_annotation_staticConst_otherClass_args() {
-    // Applying arguments to an annotation that is a static const is
-    // illegal, but shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  static const int i = 5;
-}
-
-class C {
-  @A.i(1)
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_annotation_topLevelVariable() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const int i = 5;
-class C {
-  @i
-  f() {}
-}
-''');
-    EvaluationResultImpl result =
-        _evaluateAnnotation(compilationUnit, "C", "f");
-    expect(_assertValidInt(result), 5);
-  }
-
-  void test_annotation_topLevelVariable_args() {
-    // Applying arguments to an annotation that is a top-level variable is
-    // illegal, but shouldn't crash analysis.
-    CompilationUnit compilationUnit = resolveSource(r'''
-const int i = 5;
-class C {
-  @i(1)
-  f() {}
-}
-''');
-    _evaluateAnnotation(compilationUnit, "C", "f");
-  }
-
-  void test_computeValues_cycle() {
-    TestLogger logger = new TestLogger();
-    AnalysisEngine.instance.logger = logger;
-    try {
-      Source source = addSource(r'''
-  const int a = c;
-  const int b = a;
-  const int c = b;''');
-      LibraryElement libraryElement = resolve2(source);
-      CompilationUnit unit =
-          analysisContext.resolveCompilationUnit(source, libraryElement);
-      analysisContext.computeErrors(source);
-      expect(unit, isNotNull);
-      ConstantValueComputer computer = _makeConstantValueComputer();
-      computer.add(unit, source, source);
-      computer.computeValues();
-      NodeList<CompilationUnitMember> members = unit.declarations;
-      expect(members, hasLength(3));
-      _validate(false, (members[0] as TopLevelVariableDeclaration).variables);
-      _validate(false, (members[1] as TopLevelVariableDeclaration).variables);
-      _validate(false, (members[2] as TopLevelVariableDeclaration).variables);
-    } finally {
-      AnalysisEngine.instance.logger = Logger.NULL;
-    }
-  }
-
-  void test_computeValues_dependentVariables() {
-    Source source = addSource(r'''
-const int b = a;
-const int a = 0;''');
-    LibraryElement libraryElement = resolve2(source);
-    CompilationUnit unit =
-        analysisContext.resolveCompilationUnit(source, libraryElement);
-    expect(unit, isNotNull);
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.add(unit, source, source);
-    computer.computeValues();
-    NodeList<CompilationUnitMember> members = unit.declarations;
-    expect(members, hasLength(2));
-    _validate(true, (members[0] as TopLevelVariableDeclaration).variables);
-    _validate(true, (members[1] as TopLevelVariableDeclaration).variables);
-  }
-
-  void test_computeValues_empty() {
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.computeValues();
-  }
-
-  void test_computeValues_multipleSources() {
-    Source librarySource = addNamedSource(
-        "/lib.dart",
-        r'''
-library lib;
-part 'part.dart';
-const int c = b;
-const int a = 0;''');
-    Source partSource = addNamedSource(
-        "/part.dart",
-        r'''
-part of lib;
-const int b = a;
-const int d = c;''');
-    LibraryElement libraryElement = resolve2(librarySource);
-    CompilationUnit libraryUnit =
-        analysisContext.resolveCompilationUnit(librarySource, libraryElement);
-    expect(libraryUnit, isNotNull);
-    CompilationUnit partUnit =
-        analysisContext.resolveCompilationUnit(partSource, libraryElement);
-    expect(partUnit, isNotNull);
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.add(libraryUnit, librarySource, librarySource);
-    computer.add(partUnit, partSource, librarySource);
-    computer.computeValues();
-    NodeList<CompilationUnitMember> libraryMembers = libraryUnit.declarations;
-    expect(libraryMembers, hasLength(2));
-    _validate(
-        true, (libraryMembers[0] as TopLevelVariableDeclaration).variables);
-    _validate(
-        true, (libraryMembers[1] as TopLevelVariableDeclaration).variables);
-    NodeList<CompilationUnitMember> partMembers = libraryUnit.declarations;
-    expect(partMembers, hasLength(2));
-    _validate(true, (partMembers[0] as TopLevelVariableDeclaration).variables);
-    _validate(true, (partMembers[1] as TopLevelVariableDeclaration).variables);
-  }
-
-  void test_computeValues_singleVariable() {
-    Source source = addSource("const int a = 0;");
-    LibraryElement libraryElement = resolve2(source);
-    CompilationUnit unit =
-        analysisContext.resolveCompilationUnit(source, libraryElement);
-    expect(unit, isNotNull);
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.add(unit, source, source);
-    computer.computeValues();
-    NodeList<CompilationUnitMember> members = unit.declarations;
-    expect(members, hasLength(1));
-    _validate(true, (members[0] as TopLevelVariableDeclaration).variables);
-  }
-
-  void test_computeValues_value_depends_on_enum() {
-    Source source = addSource('''
-enum E { id0, id1 }
-const E e = E.id0;
-''');
-    LibraryElement libraryElement = resolve2(source);
-    CompilationUnit unit =
-        analysisContext.resolveCompilationUnit(source, libraryElement);
-    expect(unit, isNotNull);
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.add(unit, source, source);
-    computer.computeValues();
-    TopLevelVariableDeclaration declaration = unit.declarations
-        .firstWhere((member) => member is TopLevelVariableDeclaration);
-    _validate(true, declaration.variables);
-  }
-
-  void test_dependencyOnConstructor() {
-    // x depends on "const A()"
-    _assertProperDependencies(r'''
-class A {
-  const A();
-}
-const x = const A();''');
-  }
-
-  void test_dependencyOnConstructorArgument() {
-    // "const A(x)" depends on x
-    _assertProperDependencies(r'''
-class A {
-  const A(this.next);
-  final A next;
-}
-const A x = const A(null);
-const A y = const A(x);''');
-  }
-
-  void test_dependencyOnConstructorArgument_unresolvedConstructor() {
-    // "const A.a(x)" depends on x even if the constructor A.a can't be found.
-    _assertProperDependencies(
-        r'''
-class A {
-}
-const int x = 1;
-const A y = const A.a(x);''',
-        [CompileTimeErrorCode.CONST_WITH_UNDEFINED_CONSTRUCTOR]);
-  }
-
-  void test_dependencyOnConstructorInitializer() {
-    // "const A()" depends on x
-    _assertProperDependencies(r'''
-const int x = 1;
-class A {
-  const A() : v = x;
-  final int v;
-}''');
-  }
-
-  void test_dependencyOnExplicitSuperConstructor() {
-    // b depends on B() depends on A()
-    _assertProperDependencies(r'''
-class A {
-  const A(this.x);
-  final int x;
-}
-class B extends A {
-  const B() : super(5);
-}
-const B b = const B();''');
-  }
-
-  void test_dependencyOnExplicitSuperConstructorParameters() {
-    // b depends on B() depends on i
-    _assertProperDependencies(r'''
-class A {
-  const A(this.x);
-  final int x;
-}
-class B extends A {
-  const B() : super(i);
-}
-const B b = const B();
-const int i = 5;''');
-  }
-
-  void test_dependencyOnFactoryRedirect() {
-    // a depends on A.foo() depends on A.bar()
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-class A {
-  factory const A.foo() = A.bar;
-  const A.bar();
-}''');
-  }
-
-  void test_dependencyOnFactoryRedirectWithTypeParams() {
-    _assertProperDependencies(r'''
-class A {
-  const factory A(var a) = B<int>;
-}
-
-class B<T> implements A {
-  final T x;
-  const B(this.x);
-}
-
-const A a = const A(10);''');
-  }
-
-  void test_dependencyOnImplicitSuperConstructor() {
-    // b depends on B() depends on A()
-    _assertProperDependencies(r'''
-class A {
-  const A() : x = 5;
-  final int x;
-}
-class B extends A {
-  const B();
-}
-const B b = const B();''');
-  }
-
-  void test_dependencyOnInitializedFinal() {
-    // a depends on A() depends on A.x
-    _assertProperDependencies('''
-class A {
-  const A();
-  final int x = 1;
-}
-const A a = const A();
-''');
-  }
-
-  void test_dependencyOnInitializedNonStaticConst() {
-    // Even though non-static consts are not allowed by the language, we need
-    // to handle them for error recovery purposes.
-    // a depends on A() depends on A.x
-    _assertProperDependencies(
-        '''
-class A {
-  const A();
-  const int x = 1;
-}
-const A a = const A();
-''',
-        [CompileTimeErrorCode.CONST_INSTANCE_FIELD]);
-  }
-
-  void test_dependencyOnNonFactoryRedirect() {
-    // a depends on A.foo() depends on A.bar()
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-class A {
-  const A.foo() : this.bar();
-  const A.bar();
-}''');
-  }
-
-  void test_dependencyOnNonFactoryRedirect_arg() {
-    // a depends on A.foo() depends on b
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-const int b = 1;
-class A {
-  const A.foo() : this.bar(b);
-  const A.bar(x) : y = x;
-  final int y;
-}''');
-  }
-
-  void test_dependencyOnNonFactoryRedirect_defaultValue() {
-    // a depends on A.foo() depends on A.bar() depends on b
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-const int b = 1;
-class A {
-  const A.foo() : this.bar();
-  const A.bar([x = b]) : y = x;
-  final int y;
-}''');
-  }
-
-  void test_dependencyOnNonFactoryRedirect_toMissing() {
-    // a depends on A.foo() which depends on nothing, since A.bar() is
-    // missing.
-    _assertProperDependencies(
-        r'''
-const A a = const A.foo();
-class A {
-  const A.foo() : this.bar();
-}''',
-        [CompileTimeErrorCode.REDIRECT_GENERATIVE_TO_MISSING_CONSTRUCTOR]);
-  }
-
-  void test_dependencyOnNonFactoryRedirect_toNonConst() {
-    // a depends on A.foo() which depends on nothing, since A.bar() is
-    // non-const.
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-class A {
-  const A.foo() : this.bar();
-  A.bar();
-}''');
-  }
-
-  void test_dependencyOnNonFactoryRedirect_unnamed() {
-    // a depends on A.foo() depends on A()
-    _assertProperDependencies(r'''
-const A a = const A.foo();
-class A {
-  const A.foo() : this();
-  const A();
-}''');
-  }
-
-  void test_dependencyOnOptionalParameterDefault() {
-    // a depends on A() depends on B()
-    _assertProperDependencies(r'''
-class A {
-  const A([x = const B()]) : b = x;
-  final B b;
-}
-class B {
-  const B();
-}
-const A a = const A();''');
-  }
-
-  void test_dependencyOnVariable() {
-    // x depends on y
-    _assertProperDependencies(r'''
-const x = y + 1;
-const y = 2;''');
-  }
-
-  void test_final_initialized_at_declaration() {
-    CompilationUnit compilationUnit = resolveSource('''
-class A {
-  final int i = 123;
-  const A();
-}
-
-const A a = const A();
-''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, 'a');
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "i", 123);
-  }
-
-  void test_fromEnvironment_bool_default_false() {
-    expect(_assertValidBool(_check_fromEnvironment_bool(null, "false")), false);
-  }
-
-  void test_fromEnvironment_bool_default_overridden() {
-    expect(
-        _assertValidBool(_check_fromEnvironment_bool("false", "true")), false);
-  }
-
-  void test_fromEnvironment_bool_default_parseError() {
-    expect(_assertValidBool(_check_fromEnvironment_bool("parseError", "true")),
-        true);
-  }
-
-  void test_fromEnvironment_bool_default_true() {
-    expect(_assertValidBool(_check_fromEnvironment_bool(null, "true")), true);
-  }
-
-  void test_fromEnvironment_bool_false() {
-    expect(_assertValidBool(_check_fromEnvironment_bool("false", null)), false);
-  }
-
-  void test_fromEnvironment_bool_parseError() {
-    expect(_assertValidBool(_check_fromEnvironment_bool("parseError", null)),
-        false);
-  }
-
-  void test_fromEnvironment_bool_true() {
-    expect(_assertValidBool(_check_fromEnvironment_bool("true", null)), true);
-  }
-
-  void test_fromEnvironment_bool_undeclared() {
-    _assertValidUnknown(_check_fromEnvironment_bool(null, null));
-  }
-
-  void test_fromEnvironment_int_default_overridden() {
-    expect(_assertValidInt(_check_fromEnvironment_int("234", "123")), 234);
-  }
-
-  void test_fromEnvironment_int_default_parseError() {
-    expect(
-        _assertValidInt(_check_fromEnvironment_int("parseError", "123")), 123);
-  }
-
-  void test_fromEnvironment_int_default_undeclared() {
-    expect(_assertValidInt(_check_fromEnvironment_int(null, "123")), 123);
-  }
-
-  void test_fromEnvironment_int_ok() {
-    expect(_assertValidInt(_check_fromEnvironment_int("234", null)), 234);
-  }
-
-  void test_fromEnvironment_int_parseError() {
-    _assertValidNull(_check_fromEnvironment_int("parseError", null));
-  }
-
-  void test_fromEnvironment_int_parseError_nullDefault() {
-    _assertValidNull(_check_fromEnvironment_int("parseError", "null"));
-  }
-
-  void test_fromEnvironment_int_undeclared() {
-    _assertValidUnknown(_check_fromEnvironment_int(null, null));
-  }
-
-  void test_fromEnvironment_int_undeclared_nullDefault() {
-    _assertValidNull(_check_fromEnvironment_int(null, "null"));
-  }
-
-  void test_fromEnvironment_string_default_overridden() {
-    expect(_assertValidString(_check_fromEnvironment_string("abc", "'def'")),
-        "abc");
-  }
-
-  void test_fromEnvironment_string_default_undeclared() {
-    expect(_assertValidString(_check_fromEnvironment_string(null, "'def'")),
-        "def");
-  }
-
-  void test_fromEnvironment_string_empty() {
-    expect(_assertValidString(_check_fromEnvironment_string("", null)), "");
-  }
-
-  void test_fromEnvironment_string_ok() {
-    expect(
-        _assertValidString(_check_fromEnvironment_string("abc", null)), "abc");
-  }
-
-  void test_fromEnvironment_string_undeclared() {
-    _assertValidUnknown(_check_fromEnvironment_string(null, null));
-  }
-
-  void test_fromEnvironment_string_undeclared_nullDefault() {
-    _assertValidNull(_check_fromEnvironment_string(null, "null"));
-  }
-
-  void test_instanceCreationExpression_computedField() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A(4, 5);
-class A {
-  const A(int i, int j) : k = 2 * i + j;
-  final int k;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "k", 13);
-  }
-
-  void
-      test_instanceCreationExpression_computedField_namedOptionalWithDefault() {
-    _checkInstanceCreationOptionalParams(false, true, true);
-  }
-
-  void
-      test_instanceCreationExpression_computedField_namedOptionalWithoutDefault() {
-    _checkInstanceCreationOptionalParams(false, true, false);
-  }
-
-  void
-      test_instanceCreationExpression_computedField_unnamedOptionalWithDefault() {
-    _checkInstanceCreationOptionalParams(false, false, true);
-  }
-
-  void
-      test_instanceCreationExpression_computedField_unnamedOptionalWithoutDefault() {
-    _checkInstanceCreationOptionalParams(false, false, false);
-  }
-
-  void test_instanceCreationExpression_computedField_usesConstConstructor() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A(3);
-class A {
-  const A(int i) : b = const B(4);
-  final int b;
-}
-class B {
-  const B(this.k);
-  final int k;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fieldsOfA = _assertType(result, "A");
-    expect(fieldsOfA, hasLength(1));
-    Map<String, DartObjectImpl> fieldsOfB =
-        _assertFieldType(fieldsOfA, "b", "B");
-    expect(fieldsOfB, hasLength(1));
-    _assertIntField(fieldsOfB, "k", 4);
-  }
-
-  void test_instanceCreationExpression_computedField_usesStaticConst() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A(3);
-class A {
-  const A(int i) : k = i + B.bar;
-  final int k;
-}
-class B {
-  static const bar = 4;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "k", 7);
-  }
-
-  void test_instanceCreationExpression_computedField_usesTopLevelConst() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A(3);
-const bar = 4;
-class A {
-  const A(int i) : k = i + bar;
-  final int k;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "k", 7);
-  }
-
-  void test_instanceCreationExpression_explicitSuper() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const B(4, 5);
-class A {
-  const A(this.x);
-  final int x;
-}
-class B extends A {
-  const B(int x, this.y) : super(x * 2);
-  final int y;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "B");
-    expect(fields, hasLength(2));
-    _assertIntField(fields, "y", 5);
-    Map<String, DartObjectImpl> superclassFields =
-        _assertFieldType(fields, GenericState.SUPERCLASS_FIELD, "A");
-    expect(superclassFields, hasLength(1));
-    _assertIntField(superclassFields, "x", 8);
-  }
-
-  void test_instanceCreationExpression_fieldFormalParameter() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A(42);
-class A {
-  int x;
-  const A(this.x)
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "x", 42);
-  }
-
-  void
-      test_instanceCreationExpression_fieldFormalParameter_namedOptionalWithDefault() {
-    _checkInstanceCreationOptionalParams(true, true, true);
-  }
-
-  void
-      test_instanceCreationExpression_fieldFormalParameter_namedOptionalWithoutDefault() {
-    _checkInstanceCreationOptionalParams(true, true, false);
-  }
-
-  void
-      test_instanceCreationExpression_fieldFormalParameter_unnamedOptionalWithDefault() {
-    _checkInstanceCreationOptionalParams(true, false, true);
-  }
-
-  void
-      test_instanceCreationExpression_fieldFormalParameter_unnamedOptionalWithoutDefault() {
-    _checkInstanceCreationOptionalParams(true, false, false);
-  }
-
-  void test_instanceCreationExpression_implicitSuper() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const B(4);
-class A {
-  const A() : x = 3;
-  final int x;
-}
-class B extends A {
-  const B(this.y);
-  final int y;
-}''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    Map<String, DartObjectImpl> fields = _assertType(result, "B");
-    expect(fields, hasLength(2));
-    _assertIntField(fields, "y", 4);
-    Map<String, DartObjectImpl> superclassFields =
-        _assertFieldType(fields, GenericState.SUPERCLASS_FIELD, "A");
-    expect(superclassFields, hasLength(1));
-    _assertIntField(superclassFields, "x", 3);
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1();
-class A {
-  const A.a1() : this.a2();
-  const A.a2() : x = 5;
-  final int x;
-}''');
-    Map<String, DartObjectImpl> aFields =
-        _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-    _assertIntField(aFields, 'x', 5);
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_arg() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1(1);
-class A {
-  const A.a1(x) : this.a2(x + 100);
-  const A.a2(x) : y = x + 10;
-  final int y;
-}''');
-    Map<String, DartObjectImpl> aFields =
-        _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-    _assertIntField(aFields, 'y', 111);
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_cycle() {
-    // It is an error to have a cycle in non-factory redirects; however, we
-    // need to make sure that even if the error occurs, attempting to evaluate
-    // the constant will terminate.
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A();
-class A {
-  const A() : this.b();
-  const A.b() : this();
-}''');
-    _assertValidUnknown(_evaluateTopLevelVariable(compilationUnit, "foo"));
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_defaultArg() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1();
-class A {
-  const A.a1() : this.a2();
-  const A.a2([x = 100]) : y = x + 10;
-  final int y;
-}''');
-    Map<String, DartObjectImpl> aFields =
-        _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-    _assertIntField(aFields, 'y', 110);
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_toMissing() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1();
-class A {
-  const A.a1() : this.a2();
-}''');
-    // We don't care what value foo evaluates to (since there is a compile
-    // error), but we shouldn't crash, and we should figure
-    // out that it evaluates to an instance of class A.
-    _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_toNonConst() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1();
-class A {
-  const A.a1() : this.a2();
-  A.a2();
-}''');
-    // We don't care what value foo evaluates to (since there is a compile
-    // error), but we shouldn't crash, and we should figure
-    // out that it evaluates to an instance of class A.
-    _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-  }
-
-  void test_instanceCreationExpression_nonFactoryRedirect_unnamed() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A.a1();
-class A {
-  const A.a1() : this();
-  const A() : x = 5;
-  final int x;
-}''');
-    Map<String, DartObjectImpl> aFields =
-        _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "A");
-    _assertIntField(aFields, 'x', 5);
-  }
-
-  void test_instanceCreationExpression_redirect() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A();
-class A {
-  const factory A() = B;
-}
-class B implements A {
-  const B();
-}''');
-    _assertType(_evaluateTopLevelVariable(compilationUnit, "foo"), "B");
-  }
-
-  void test_instanceCreationExpression_redirect_cycle() {
-    // It is an error to have a cycle in factory redirects; however, we need
-    // to make sure that even if the error occurs, attempting to evaluate the
-    // constant will terminate.
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A();
-class A {
-  const factory A() = A.b;
-  const factory A.b() = A;
-}''');
-    _assertValidUnknown(_evaluateTopLevelVariable(compilationUnit, "foo"));
-  }
-
-  void test_instanceCreationExpression_redirect_external() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A();
-class A {
-  external const factory A();
-}''');
-    _assertValidUnknown(_evaluateTopLevelVariable(compilationUnit, "foo"));
-  }
-
-  void test_instanceCreationExpression_redirect_nonConst() {
-    // It is an error for a const factory constructor redirect to a non-const
-    // constructor; however, we need to make sure that even if the error
-    // attempting to evaluate the constant won't cause a crash.
-    CompilationUnit compilationUnit = resolveSource(r'''
-const foo = const A();
-class A {
-  const factory A() = A.b;
-  A.b();
-}''');
-    _assertValidUnknown(_evaluateTopLevelVariable(compilationUnit, "foo"));
-  }
-
-  void test_instanceCreationExpression_redirectWithTypeParams() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A {
-  const factory A(var a) = B<int>;
-}
-
-class B<T> implements A {
-  final T x;
-  const B(this.x);
-}
-
-const A a = const A(10);''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "a");
-    Map<String, DartObjectImpl> fields = _assertType(result, "B<int>");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "x", 10);
-  }
-
-  void test_instanceCreationExpression_redirectWithTypeSubstitution() {
-    // To evaluate the redirection of A<int>,
-    // A's template argument (T=int) must be substituted
-    // into B's template argument (B<U> where U=T) to get B<int>.
-    CompilationUnit compilationUnit = resolveSource(r'''
-class A<T> {
-  const factory A(var a) = B<T>;
-}
-
-class B<U> implements A {
-  final U x;
-  const B(this.x);
-}
-
-const A<int> a = const A<int>(10);''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, "a");
-    Map<String, DartObjectImpl> fields = _assertType(result, "B<int>");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "x", 10);
-  }
-
-  void test_instanceCreationExpression_symbol() {
-    CompilationUnit compilationUnit =
-        resolveSource("const foo = const Symbol('a');");
-    EvaluationResultImpl evaluationResult =
-        _evaluateTopLevelVariable(compilationUnit, "foo");
-    expect(evaluationResult.value, isNotNull);
-    DartObjectImpl value = evaluationResult.value;
-    expect(value.type, typeProvider.symbolType);
-    expect(value.toSymbolValue(), "a");
-  }
-
-  void test_instanceCreationExpression_withSupertypeParams_explicit() {
-    _checkInstanceCreation_withSupertypeParams(true);
-  }
-
-  void test_instanceCreationExpression_withSupertypeParams_implicit() {
-    _checkInstanceCreation_withSupertypeParams(false);
-  }
-
-  void test_instanceCreationExpression_withTypeParams() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-class C<E> {
-  const C();
-}
-const c_int = const C<int>();
-const c_num = const C<num>();''');
-    EvaluationResultImpl c_int =
-        _evaluateTopLevelVariable(compilationUnit, "c_int");
-    _assertType(c_int, "C<int>");
-    DartObjectImpl c_int_value = c_int.value;
-    EvaluationResultImpl c_num =
-        _evaluateTopLevelVariable(compilationUnit, "c_num");
-    _assertType(c_num, "C<num>");
-    DartObjectImpl c_num_value = c_num.value;
-    expect(c_int_value == c_num_value, isFalse);
-  }
-
-  void test_isValidSymbol() {
-    expect(ConstantEvaluationEngine.isValidPublicSymbol(""), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo.bar"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo\$"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo\$bar"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("iff"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("gif"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("if\$"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("\$if"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo="), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo.bar="), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo.+"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("void"), isTrue);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("_foo"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("_foo.bar"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo._bar"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("if"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("if.foo"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo.if"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo=.bar"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo."), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("+.foo"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("void.foo"), isFalse);
-    expect(ConstantEvaluationEngine.isValidPublicSymbol("foo.void"), isFalse);
-  }
-
-  void test_length_of_improperly_typed_string_expression() {
-    // Since type annotations are ignored in unchecked mode, the improper
-    // types on s1 and s2 shouldn't prevent us from evaluating i to
-    // 'alpha'.length.
-    CompilationUnit compilationUnit = resolveSource('''
-const int s1 = 'alpha';
-const int s2 = 'beta';
-const int i = (true ? s1 : s2).length;
-''');
-    ConstTopLevelVariableElementImpl element =
-        findTopLevelDeclaration(compilationUnit, 'i').element;
-    EvaluationResultImpl result = element.evaluationResult;
-    expect(_assertValidInt(result), 5);
-  }
-
-  void test_length_of_improperly_typed_string_identifier() {
-    // Since type annotations are ignored in unchecked mode, the improper type
-    // on s shouldn't prevent us from evaluating i to 'alpha'.length.
-    CompilationUnit compilationUnit = resolveSource('''
-const int s = 'alpha';
-const int i = s.length;
-''');
-    ConstTopLevelVariableElementImpl element =
-        findTopLevelDeclaration(compilationUnit, 'i').element;
-    EvaluationResultImpl result = element.evaluationResult;
-    expect(_assertValidInt(result), 5);
-  }
-
-  void test_non_static_const_initialized_at_declaration() {
-    // Even though non-static consts are not allowed by the language, we need
-    // to handle them for error recovery purposes.
-    CompilationUnit compilationUnit = resolveSource('''
-class A {
-  const int i = 123;
-  const A();
-}
-
-const A a = const A();
-''');
-    EvaluationResultImpl result =
-        _evaluateTopLevelVariable(compilationUnit, 'a');
-    Map<String, DartObjectImpl> fields = _assertType(result, "A");
-    expect(fields, hasLength(1));
-    _assertIntField(fields, "i", 123);
-  }
-
-  void test_symbolLiteral_void() {
-    CompilationUnit compilationUnit =
-        resolveSource("const voidSymbol = #void;");
-    VariableDeclaration voidSymbol =
-        findTopLevelDeclaration(compilationUnit, "voidSymbol");
-    EvaluationResultImpl voidSymbolResult =
-        (voidSymbol.element as VariableElementImpl).evaluationResult;
-    DartObjectImpl value = voidSymbolResult.value;
-    expect(value.type, typeProvider.symbolType);
-    expect(value.toSymbolValue(), "void");
-  }
-
-  Map<String, DartObjectImpl> _assertFieldType(
-      Map<String, DartObjectImpl> fields,
-      String fieldName,
-      String expectedType) {
-    DartObjectImpl field = fields[fieldName];
-    expect(field.type.displayName, expectedType);
-    return field.fields;
-  }
-
-  void _assertIntField(
-      Map<String, DartObjectImpl> fields, String fieldName, int expectedValue) {
-    DartObjectImpl field = fields[fieldName];
-    expect(field.type.name, "int");
-    expect(field.toIntValue(), expectedValue);
-  }
-
-  void _assertNullField(Map<String, DartObjectImpl> fields, String fieldName) {
-    DartObjectImpl field = fields[fieldName];
-    expect(field.isNull, isTrue);
-  }
-
-  void _assertProperDependencies(String sourceText,
-      [List<ErrorCode> expectedErrorCodes = ErrorCode.EMPTY_LIST]) {
-    Source source = addSource(sourceText);
-    LibraryElement element = resolve2(source);
-    CompilationUnit unit =
-        analysisContext.resolveCompilationUnit(source, element);
-    expect(unit, isNotNull);
-    ConstantValueComputer computer = _makeConstantValueComputer();
-    computer.add(unit, source, source);
-    computer.computeValues();
-    assertErrors(source, expectedErrorCodes);
-  }
-
-  Map<String, DartObjectImpl> _assertType(
-      EvaluationResultImpl result, String typeName) {
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.type.displayName, typeName);
-    return value.fields;
-  }
-
-  bool _assertValidBool(EvaluationResultImpl result) {
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.type, typeProvider.boolType);
-    bool boolValue = value.toBoolValue();
-    expect(boolValue, isNotNull);
-    return boolValue;
-  }
-
-  int _assertValidInt(EvaluationResultImpl result) {
-    expect(result, isNotNull);
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.type, typeProvider.intType);
-    return value.toIntValue();
-  }
-
-  void _assertValidNull(EvaluationResultImpl result) {
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.type, typeProvider.nullType);
-  }
-
-  String _assertValidString(EvaluationResultImpl result) {
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.type, typeProvider.stringType);
-    return value.toStringValue();
-  }
-
-  void _assertValidUnknown(EvaluationResultImpl result) {
-    expect(result.value, isNotNull);
-    DartObjectImpl value = result.value;
-    expect(value.isUnknown, isTrue);
-  }
-
-  EvaluationResultImpl _check_fromEnvironment_bool(
-      String valueInEnvironment, String defaultExpr) {
-    String envVarName = "x";
-    String varName = "foo";
-    if (valueInEnvironment != null) {
-      analysisContext2.declaredVariables.define(envVarName, valueInEnvironment);
-    }
-    String defaultArg =
-        defaultExpr == null ? "" : ", defaultValue: $defaultExpr";
-    CompilationUnit compilationUnit = resolveSource(
-        "const $varName = const bool.fromEnvironment('$envVarName'$defaultArg);");
-    return _evaluateTopLevelVariable(compilationUnit, varName);
-  }
-
-  EvaluationResultImpl _check_fromEnvironment_int(
-      String valueInEnvironment, String defaultExpr) {
-    String envVarName = "x";
-    String varName = "foo";
-    if (valueInEnvironment != null) {
-      analysisContext2.declaredVariables.define(envVarName, valueInEnvironment);
-    }
-    String defaultArg =
-        defaultExpr == null ? "" : ", defaultValue: $defaultExpr";
-    CompilationUnit compilationUnit = resolveSource(
-        "const $varName = const int.fromEnvironment('$envVarName'$defaultArg);");
-    return _evaluateTopLevelVariable(compilationUnit, varName);
-  }
-
-  EvaluationResultImpl _check_fromEnvironment_string(
-      String valueInEnvironment, String defaultExpr) {
-    String envVarName = "x";
-    String varName = "foo";
-    if (valueInEnvironment != null) {
-      analysisContext2.declaredVariables.define(envVarName, valueInEnvironment);
-    }
-    String defaultArg =
-        defaultExpr == null ? "" : ", defaultValue: $defaultExpr";
-    CompilationUnit compilationUnit = resolveSource(
-        "const $varName = const String.fromEnvironment('$envVarName'$defaultArg);");
-    return _evaluateTopLevelVariable(compilationUnit, varName);
-  }
-
-  void _checkInstanceCreation_withSupertypeParams(bool isExplicit) {
-    String superCall = isExplicit ? " : super()" : "";
-    CompilationUnit compilationUnit = resolveSource("""
-class A<T> {
-  const A();
-}
-class B<T, U> extends A<T> {
-  const B()$superCall;
-}
-class C<T, U> extends A<U> {
-  const C()$superCall;
-}
-const b_int_num = const B<int, num>();
-const c_int_num = const C<int, num>();""");
-    EvaluationResultImpl b_int_num =
-        _evaluateTopLevelVariable(compilationUnit, "b_int_num");
-    Map<String, DartObjectImpl> b_int_num_fields =
-        _assertType(b_int_num, "B<int, num>");
-    _assertFieldType(b_int_num_fields, GenericState.SUPERCLASS_FIELD, "A<int>");
-    EvaluationResultImpl c_int_num =
-        _evaluateTopLevelVariable(compilationUnit, "c_int_num");
-    Map<String, DartObjectImpl> c_int_num_fields =
-        _assertType(c_int_num, "C<int, num>");
-    _assertFieldType(c_int_num_fields, GenericState.SUPERCLASS_FIELD, "A<num>");
-  }
-
-  void _checkInstanceCreationOptionalParams(
-      bool isFieldFormal, bool isNamed, bool hasDefault) {
-    String fieldName = "j";
-    String paramName = isFieldFormal ? fieldName : "i";
-    String formalParam =
-        "${isFieldFormal ? "this." : "int "}$paramName${hasDefault ? " = 3" : ""}";
-    CompilationUnit compilationUnit = resolveSource("""
-const x = const A();
-const y = const A(${isNamed ? '$paramName: ' : ''}10);
-class A {
-  const A(${isNamed ? "{$formalParam}" : "[$formalParam]"})${isFieldFormal ? "" : " : $fieldName = $paramName"};
-  final int $fieldName;
-}""");
-    EvaluationResultImpl x = _evaluateTopLevelVariable(compilationUnit, "x");
-    Map<String, DartObjectImpl> fieldsOfX = _assertType(x, "A");
-    expect(fieldsOfX, hasLength(1));
-    if (hasDefault) {
-      _assertIntField(fieldsOfX, fieldName, 3);
-    } else {
-      _assertNullField(fieldsOfX, fieldName);
-    }
-    EvaluationResultImpl y = _evaluateTopLevelVariable(compilationUnit, "y");
-    Map<String, DartObjectImpl> fieldsOfY = _assertType(y, "A");
-    expect(fieldsOfY, hasLength(1));
-    _assertIntField(fieldsOfY, fieldName, 10);
-  }
-
-  /**
-   * Search [compilationUnit] for a class named [className], containing a
-   * method [methodName], with exactly one annotation.  Return the constant
-   * value of the annotation.
-   */
-  EvaluationResultImpl _evaluateAnnotation(
-      CompilationUnit compilationUnit, String className, String memberName) {
-    for (CompilationUnitMember member in compilationUnit.declarations) {
-      if (member is ClassDeclaration && member.name.name == className) {
-        for (ClassMember classMember in member.members) {
-          if (classMember is MethodDeclaration &&
-              classMember.name.name == memberName) {
-            expect(classMember.metadata, hasLength(1));
-            ElementAnnotationImpl elementAnnotation =
-                classMember.metadata[0].elementAnnotation;
-            return elementAnnotation.evaluationResult;
-          }
-        }
-      }
-    }
-    fail('Class member not found');
-    return null;
-  }
-
-  EvaluationResultImpl _evaluateTopLevelVariable(
-      CompilationUnit compilationUnit, String name) {
-    VariableDeclaration varDecl =
-        findTopLevelDeclaration(compilationUnit, name);
-    ConstTopLevelVariableElementImpl varElement = varDecl.element;
-    return varElement.evaluationResult;
-  }
-
-  ConstantValueComputer _makeConstantValueComputer() {
-    ConstantEvaluationValidator_ForTest validator =
-        new ConstantEvaluationValidator_ForTest(analysisContext2);
-    validator.computer = new ConstantValueComputer(
-        analysisContext2,
-        analysisContext2.typeProvider,
-        analysisContext2.declaredVariables,
-        validator,
-        analysisContext2.typeSystem);
-    return validator.computer;
-  }
-
-  void _validate(bool shouldBeValid, VariableDeclarationList declarationList) {
-    for (VariableDeclaration declaration in declarationList.variables) {
-      VariableElementImpl element = declaration.element as VariableElementImpl;
-      expect(element, isNotNull);
-      EvaluationResultImpl result = element.evaluationResult;
-      if (shouldBeValid) {
-        expect(result.value, isNotNull);
-      } else {
-        expect(result.value, isNull);
-      }
-    }
-  }
-}
-
-@reflectiveTest
-class ConstantVisitorTest extends ResolverTestCase {
-  void test_visitBinaryExpression_questionQuestion_notNull_notNull() {
-    Expression left = AstFactory.string2('a');
-    Expression right = AstFactory.string2('b');
-    Expression expression =
-        AstFactory.binaryExpression(left, TokenType.QUESTION_QUESTION, right);
-
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNotNull);
-    expect(result.isNull, isFalse);
-    expect(result.toStringValue(), 'a');
-    errorListener.assertNoErrors();
-  }
-
-  void test_visitBinaryExpression_questionQuestion_null_notNull() {
-    Expression left = AstFactory.nullLiteral();
-    Expression right = AstFactory.string2('b');
-    Expression expression =
-        AstFactory.binaryExpression(left, TokenType.QUESTION_QUESTION, right);
-
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNotNull);
-    expect(result.isNull, isFalse);
-    expect(result.toStringValue(), 'b');
-    errorListener.assertNoErrors();
-  }
-
-  void test_visitBinaryExpression_questionQuestion_null_null() {
-    Expression left = AstFactory.nullLiteral();
-    Expression right = AstFactory.nullLiteral();
-    Expression expression =
-        AstFactory.binaryExpression(left, TokenType.QUESTION_QUESTION, right);
-
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNotNull);
-    expect(result.isNull, isTrue);
-    errorListener.assertNoErrors();
-  }
-
-  void test_visitConditionalExpression_false() {
-    Expression thenExpression = AstFactory.integer(1);
-    Expression elseExpression = AstFactory.integer(0);
-    ConditionalExpression expression = AstFactory.conditionalExpression(
-        AstFactory.booleanLiteral(false), thenExpression, elseExpression);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    _assertValue(0, _evaluate(expression, errorReporter));
-    errorListener.assertNoErrors();
-  }
-
-  void test_visitConditionalExpression_nonBooleanCondition() {
-    Expression thenExpression = AstFactory.integer(1);
-    Expression elseExpression = AstFactory.integer(0);
-    NullLiteral conditionExpression = AstFactory.nullLiteral();
-    ConditionalExpression expression = AstFactory.conditionalExpression(
-        conditionExpression, thenExpression, elseExpression);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNull);
-    errorListener
-        .assertErrorsWithCodes([CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL]);
-  }
-
-  void test_visitConditionalExpression_nonConstantElse() {
-    Expression thenExpression = AstFactory.integer(1);
-    Expression elseExpression = AstFactory.identifier3("x");
-    ConditionalExpression expression = AstFactory.conditionalExpression(
-        AstFactory.booleanLiteral(true), thenExpression, elseExpression);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNull);
-    errorListener
-        .assertErrorsWithCodes([CompileTimeErrorCode.INVALID_CONSTANT]);
-  }
-
-  void test_visitConditionalExpression_nonConstantThen() {
-    Expression thenExpression = AstFactory.identifier3("x");
-    Expression elseExpression = AstFactory.integer(0);
-    ConditionalExpression expression = AstFactory.conditionalExpression(
-        AstFactory.booleanLiteral(true), thenExpression, elseExpression);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    DartObjectImpl result = _evaluate(expression, errorReporter);
-    expect(result, isNull);
-    errorListener
-        .assertErrorsWithCodes([CompileTimeErrorCode.INVALID_CONSTANT]);
-  }
-
-  void test_visitConditionalExpression_true() {
-    Expression thenExpression = AstFactory.integer(1);
-    Expression elseExpression = AstFactory.integer(0);
-    ConditionalExpression expression = AstFactory.conditionalExpression(
-        AstFactory.booleanLiteral(true), thenExpression, elseExpression);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter =
-        new ErrorReporter(errorListener, _dummySource());
-    _assertValue(1, _evaluate(expression, errorReporter));
-    errorListener.assertNoErrors();
-  }
-
-  void test_visitSimpleIdentifier_className() {
-    CompilationUnit compilationUnit = resolveSource('''
-const a = C;
-class C {}
-''');
-    DartObjectImpl result = _evaluateConstant(compilationUnit, 'a', null);
-    expect(result.type, typeProvider.typeType);
-    expect(result.toTypeValue().name, 'C');
-  }
-
-  void test_visitSimpleIdentifier_dynamic() {
-    CompilationUnit compilationUnit = resolveSource('''
-const a = dynamic;
-''');
-    DartObjectImpl result = _evaluateConstant(compilationUnit, 'a', null);
-    expect(result.type, typeProvider.typeType);
-    expect(result.toTypeValue(), typeProvider.dynamicType);
-  }
-
-  void test_visitSimpleIdentifier_inEnvironment() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const a = b;
-const b = 3;''');
-    Map<String, DartObjectImpl> environment = new Map<String, DartObjectImpl>();
-    DartObjectImpl six =
-        new DartObjectImpl(typeProvider.intType, new IntState(6));
-    environment["b"] = six;
-    _assertValue(6, _evaluateConstant(compilationUnit, "a", environment));
-  }
-
-  void test_visitSimpleIdentifier_notInEnvironment() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const a = b;
-const b = 3;''');
-    Map<String, DartObjectImpl> environment = new Map<String, DartObjectImpl>();
-    DartObjectImpl six =
-        new DartObjectImpl(typeProvider.intType, new IntState(6));
-    environment["c"] = six;
-    _assertValue(3, _evaluateConstant(compilationUnit, "a", environment));
-  }
-
-  void test_visitSimpleIdentifier_withoutEnvironment() {
-    CompilationUnit compilationUnit = resolveSource(r'''
-const a = b;
-const b = 3;''');
-    _assertValue(3, _evaluateConstant(compilationUnit, "a", null));
-  }
-
-  void _assertValue(int expectedValue, DartObjectImpl result) {
-    expect(result, isNotNull);
-    expect(result.type.name, "int");
-    expect(result.toIntValue(), expectedValue);
-  }
-
-  NonExistingSource _dummySource() {
-    String path = '/test.dart';
-    return new NonExistingSource(path, toUri(path), UriKind.FILE_URI);
-  }
-
-  DartObjectImpl _evaluate(Expression expression, ErrorReporter errorReporter) {
-    return expression.accept(new ConstantVisitor(
-        new ConstantEvaluationEngine(
-            new TestTypeProvider(), new DeclaredVariables(),
-            typeSystem: new TypeSystemImpl()),
-        errorReporter));
-  }
-
-  DartObjectImpl _evaluateConstant(CompilationUnit compilationUnit, String name,
-      Map<String, DartObjectImpl> lexicalEnvironment) {
-    Source source = compilationUnit.element.source;
-    Expression expression =
-        findTopLevelConstantExpression(compilationUnit, name);
-    GatheringErrorListener errorListener = new GatheringErrorListener();
-    ErrorReporter errorReporter = new ErrorReporter(errorListener, source);
-    DartObjectImpl result = expression.accept(new ConstantVisitor(
-        new ConstantEvaluationEngine(typeProvider, new DeclaredVariables(),
-            typeSystem: typeSystem),
-        errorReporter,
-        lexicalEnvironment: lexicalEnvironment));
-    errorListener.assertNoErrors();
-    return result;
-  }
-}
-
-@reflectiveTest
-class DartObjectImplTest extends EngineTestCase {
-  TypeProvider _typeProvider = new TestTypeProvider();
-
-  void test_add_knownDouble_knownDouble() {
-    _assertAdd(_doubleValue(3.0), _doubleValue(1.0), _doubleValue(2.0));
-  }
-
-  void test_add_knownDouble_knownInt() {
-    _assertAdd(_doubleValue(3.0), _doubleValue(1.0), _intValue(2));
-  }
-
-  void test_add_knownDouble_unknownDouble() {
-    _assertAdd(_doubleValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_add_knownDouble_unknownInt() {
-    _assertAdd(_doubleValue(null), _doubleValue(1.0), _intValue(null));
-  }
-
-  void test_add_knownInt_knownInt() {
-    _assertAdd(_intValue(3), _intValue(1), _intValue(2));
-  }
-
-  void test_add_knownInt_knownString() {
-    _assertAdd(null, _intValue(1), _stringValue("2"));
-  }
-
-  void test_add_knownInt_unknownDouble() {
-    _assertAdd(_doubleValue(null), _intValue(1), _doubleValue(null));
-  }
-
-  void test_add_knownInt_unknownInt() {
-    _assertAdd(_intValue(null), _intValue(1), _intValue(null));
-  }
-
-  void test_add_knownString_knownInt() {
-    _assertAdd(null, _stringValue("1"), _intValue(2));
-  }
-
-  void test_add_knownString_knownString() {
-    _assertAdd(_stringValue("ab"), _stringValue("a"), _stringValue("b"));
-  }
-
-  void test_add_knownString_unknownString() {
-    _assertAdd(_stringValue(null), _stringValue("a"), _stringValue(null));
-  }
-
-  void test_add_unknownDouble_knownDouble() {
-    _assertAdd(_doubleValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_add_unknownDouble_knownInt() {
-    _assertAdd(_doubleValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_add_unknownInt_knownDouble() {
-    _assertAdd(_doubleValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_add_unknownInt_knownInt() {
-    _assertAdd(_intValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_add_unknownString_knownString() {
-    _assertAdd(_stringValue(null), _stringValue(null), _stringValue("b"));
-  }
-
-  void test_add_unknownString_unknownString() {
-    _assertAdd(_stringValue(null), _stringValue(null), _stringValue(null));
-  }
-
-  void test_bitAnd_knownInt_knownInt() {
-    _assertBitAnd(_intValue(2), _intValue(6), _intValue(3));
-  }
-
-  void test_bitAnd_knownInt_knownString() {
-    _assertBitAnd(null, _intValue(6), _stringValue("3"));
-  }
-
-  void test_bitAnd_knownInt_unknownInt() {
-    _assertBitAnd(_intValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_bitAnd_knownString_knownInt() {
-    _assertBitAnd(null, _stringValue("6"), _intValue(3));
-  }
-
-  void test_bitAnd_unknownInt_knownInt() {
-    _assertBitAnd(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_bitAnd_unknownInt_unknownInt() {
-    _assertBitAnd(_intValue(null), _intValue(null), _intValue(null));
-  }
-
-  void test_bitNot_knownInt() {
-    _assertBitNot(_intValue(-4), _intValue(3));
-  }
-
-  void test_bitNot_knownString() {
-    _assertBitNot(null, _stringValue("6"));
-  }
-
-  void test_bitNot_unknownInt() {
-    _assertBitNot(_intValue(null), _intValue(null));
-  }
-
-  void test_bitOr_knownInt_knownInt() {
-    _assertBitOr(_intValue(7), _intValue(6), _intValue(3));
-  }
-
-  void test_bitOr_knownInt_knownString() {
-    _assertBitOr(null, _intValue(6), _stringValue("3"));
-  }
-
-  void test_bitOr_knownInt_unknownInt() {
-    _assertBitOr(_intValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_bitOr_knownString_knownInt() {
-    _assertBitOr(null, _stringValue("6"), _intValue(3));
-  }
-
-  void test_bitOr_unknownInt_knownInt() {
-    _assertBitOr(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_bitOr_unknownInt_unknownInt() {
-    _assertBitOr(_intValue(null), _intValue(null), _intValue(null));
-  }
-
-  void test_bitXor_knownInt_knownInt() {
-    _assertBitXor(_intValue(5), _intValue(6), _intValue(3));
-  }
-
-  void test_bitXor_knownInt_knownString() {
-    _assertBitXor(null, _intValue(6), _stringValue("3"));
-  }
-
-  void test_bitXor_knownInt_unknownInt() {
-    _assertBitXor(_intValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_bitXor_knownString_knownInt() {
-    _assertBitXor(null, _stringValue("6"), _intValue(3));
-  }
-
-  void test_bitXor_unknownInt_knownInt() {
-    _assertBitXor(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_bitXor_unknownInt_unknownInt() {
-    _assertBitXor(_intValue(null), _intValue(null), _intValue(null));
-  }
-
-  void test_concatenate_knownInt_knownString() {
-    _assertConcatenate(null, _intValue(2), _stringValue("def"));
-  }
-
-  void test_concatenate_knownString_knownInt() {
-    _assertConcatenate(null, _stringValue("abc"), _intValue(3));
-  }
-
-  void test_concatenate_knownString_knownString() {
-    _assertConcatenate(
-        _stringValue("abcdef"), _stringValue("abc"), _stringValue("def"));
-  }
-
-  void test_concatenate_knownString_unknownString() {
-    _assertConcatenate(
-        _stringValue(null), _stringValue("abc"), _stringValue(null));
-  }
-
-  void test_concatenate_unknownString_knownString() {
-    _assertConcatenate(
-        _stringValue(null), _stringValue(null), _stringValue("def"));
-  }
-
-  void test_divide_knownDouble_knownDouble() {
-    _assertDivide(_doubleValue(3.0), _doubleValue(6.0), _doubleValue(2.0));
-  }
-
-  void test_divide_knownDouble_knownInt() {
-    _assertDivide(_doubleValue(3.0), _doubleValue(6.0), _intValue(2));
-  }
-
-  void test_divide_knownDouble_unknownDouble() {
-    _assertDivide(_doubleValue(null), _doubleValue(6.0), _doubleValue(null));
-  }
-
-  void test_divide_knownDouble_unknownInt() {
-    _assertDivide(_doubleValue(null), _doubleValue(6.0), _intValue(null));
-  }
-
-  void test_divide_knownInt_knownInt() {
-    _assertDivide(_doubleValue(3.0), _intValue(6), _intValue(2));
-  }
-
-  void test_divide_knownInt_knownString() {
-    _assertDivide(null, _intValue(6), _stringValue("2"));
-  }
-
-  void test_divide_knownInt_unknownDouble() {
-    _assertDivide(_doubleValue(null), _intValue(6), _doubleValue(null));
-  }
-
-  void test_divide_knownInt_unknownInt() {
-    _assertDivide(_doubleValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_divide_knownString_knownInt() {
-    _assertDivide(null, _stringValue("6"), _intValue(2));
-  }
-
-  void test_divide_unknownDouble_knownDouble() {
-    _assertDivide(_doubleValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_divide_unknownDouble_knownInt() {
-    _assertDivide(_doubleValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_divide_unknownInt_knownDouble() {
-    _assertDivide(_doubleValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_divide_unknownInt_knownInt() {
-    _assertDivide(_doubleValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_equalEqual_bool_false() {
-    _assertEqualEqual(_boolValue(false), _boolValue(false), _boolValue(true));
-  }
-
-  void test_equalEqual_bool_true() {
-    _assertEqualEqual(_boolValue(true), _boolValue(true), _boolValue(true));
-  }
-
-  void test_equalEqual_bool_unknown() {
-    _assertEqualEqual(_boolValue(null), _boolValue(null), _boolValue(false));
-  }
-
-  void test_equalEqual_double_false() {
-    _assertEqualEqual(_boolValue(false), _doubleValue(2.0), _doubleValue(4.0));
-  }
-
-  void test_equalEqual_double_true() {
-    _assertEqualEqual(_boolValue(true), _doubleValue(2.0), _doubleValue(2.0));
-  }
-
-  void test_equalEqual_double_unknown() {
-    _assertEqualEqual(_boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_equalEqual_int_false() {
-    _assertEqualEqual(_boolValue(false), _intValue(-5), _intValue(5));
-  }
-
-  void test_equalEqual_int_true() {
-    _assertEqualEqual(_boolValue(true), _intValue(5), _intValue(5));
-  }
-
-  void test_equalEqual_int_unknown() {
-    _assertEqualEqual(_boolValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_equalEqual_list_empty() {
-    _assertEqualEqual(null, _listValue(), _listValue());
-  }
-
-  void test_equalEqual_list_false() {
-    _assertEqualEqual(null, _listValue(), _listValue());
-  }
-
-  void test_equalEqual_map_empty() {
-    _assertEqualEqual(null, _mapValue(), _mapValue());
-  }
-
-  void test_equalEqual_map_false() {
-    _assertEqualEqual(null, _mapValue(), _mapValue());
-  }
-
-  void test_equalEqual_null() {
-    _assertEqualEqual(_boolValue(true), _nullValue(), _nullValue());
-  }
-
-  void test_equalEqual_string_false() {
-    _assertEqualEqual(
-        _boolValue(false), _stringValue("abc"), _stringValue("def"));
-  }
-
-  void test_equalEqual_string_true() {
-    _assertEqualEqual(
-        _boolValue(true), _stringValue("abc"), _stringValue("abc"));
-  }
-
-  void test_equalEqual_string_unknown() {
-    _assertEqualEqual(
-        _boolValue(null), _stringValue(null), _stringValue("def"));
-  }
-
-  void test_equals_list_false_differentSizes() {
-    expect(
-        _listValue([_boolValue(true)]) ==
-            _listValue([_boolValue(true), _boolValue(false)]),
-        isFalse);
-  }
-
-  void test_equals_list_false_sameSize() {
-    expect(_listValue([_boolValue(true)]) == _listValue([_boolValue(false)]),
-        isFalse);
-  }
-
-  void test_equals_list_true_empty() {
-    expect(_listValue(), _listValue());
-  }
-
-  void test_equals_list_true_nonEmpty() {
-    expect(_listValue([_boolValue(true)]), _listValue([_boolValue(true)]));
-  }
-
-  void test_equals_map_true_empty() {
-    expect(_mapValue(), _mapValue());
-  }
-
-  void test_equals_symbol_false() {
-    expect(_symbolValue("a") == _symbolValue("b"), isFalse);
-  }
-
-  void test_equals_symbol_true() {
-    expect(_symbolValue("a"), _symbolValue("a"));
-  }
-
-  void test_getValue_bool_false() {
-    expect(_boolValue(false).toBoolValue(), false);
-  }
-
-  void test_getValue_bool_true() {
-    expect(_boolValue(true).toBoolValue(), true);
-  }
-
-  void test_getValue_bool_unknown() {
-    expect(_boolValue(null).toBoolValue(), isNull);
-  }
-
-  void test_getValue_double_known() {
-    double value = 2.3;
-    expect(_doubleValue(value).toDoubleValue(), value);
-  }
-
-  void test_getValue_double_unknown() {
-    expect(_doubleValue(null).toDoubleValue(), isNull);
-  }
-
-  void test_getValue_int_known() {
-    int value = 23;
-    expect(_intValue(value).toIntValue(), value);
-  }
-
-  void test_getValue_int_unknown() {
-    expect(_intValue(null).toIntValue(), isNull);
-  }
-
-  void test_getValue_list_empty() {
-    Object result = _listValue().toListValue();
-    _assertInstanceOfObjectArray(result);
-    List<Object> array = result as List<Object>;
-    expect(array, hasLength(0));
-  }
-
-  void test_getValue_list_valid() {
-    Object result = _listValue([_intValue(23)]).toListValue();
-    _assertInstanceOfObjectArray(result);
-    List<Object> array = result as List<Object>;
-    expect(array, hasLength(1));
-  }
-
-  void test_getValue_map_empty() {
-    Object result = _mapValue().toMapValue();
-    EngineTestCase.assertInstanceOf((obj) => obj is Map, Map, result);
-    Map map = result as Map;
-    expect(map, hasLength(0));
-  }
-
-  void test_getValue_map_valid() {
-    Object result =
-        _mapValue([_stringValue("key"), _stringValue("value")]).toMapValue();
-    EngineTestCase.assertInstanceOf((obj) => obj is Map, Map, result);
-    Map map = result as Map;
-    expect(map, hasLength(1));
-  }
-
-  void test_getValue_null() {
-    expect(_nullValue().isNull, isTrue);
-  }
-
-  void test_getValue_string_known() {
-    String value = "twenty-three";
-    expect(_stringValue(value).toStringValue(), value);
-  }
-
-  void test_getValue_string_unknown() {
-    expect(_stringValue(null).toStringValue(), isNull);
-  }
-
-  void test_greaterThan_knownDouble_knownDouble_false() {
-    _assertGreaterThan(_boolValue(false), _doubleValue(1.0), _doubleValue(2.0));
-  }
-
-  void test_greaterThan_knownDouble_knownDouble_true() {
-    _assertGreaterThan(_boolValue(true), _doubleValue(2.0), _doubleValue(1.0));
-  }
-
-  void test_greaterThan_knownDouble_knownInt_false() {
-    _assertGreaterThan(_boolValue(false), _doubleValue(1.0), _intValue(2));
-  }
-
-  void test_greaterThan_knownDouble_knownInt_true() {
-    _assertGreaterThan(_boolValue(true), _doubleValue(2.0), _intValue(1));
-  }
-
-  void test_greaterThan_knownDouble_unknownDouble() {
-    _assertGreaterThan(_boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_greaterThan_knownDouble_unknownInt() {
-    _assertGreaterThan(_boolValue(null), _doubleValue(1.0), _intValue(null));
-  }
-
-  void test_greaterThan_knownInt_knownInt_false() {
-    _assertGreaterThan(_boolValue(false), _intValue(1), _intValue(2));
-  }
-
-  void test_greaterThan_knownInt_knownInt_true() {
-    _assertGreaterThan(_boolValue(true), _intValue(2), _intValue(1));
-  }
-
-  void test_greaterThan_knownInt_knownString() {
-    _assertGreaterThan(null, _intValue(1), _stringValue("2"));
-  }
-
-  void test_greaterThan_knownInt_unknownDouble() {
-    _assertGreaterThan(_boolValue(null), _intValue(1), _doubleValue(null));
-  }
-
-  void test_greaterThan_knownInt_unknownInt() {
-    _assertGreaterThan(_boolValue(null), _intValue(1), _intValue(null));
-  }
-
-  void test_greaterThan_knownString_knownInt() {
-    _assertGreaterThan(null, _stringValue("1"), _intValue(2));
-  }
-
-  void test_greaterThan_unknownDouble_knownDouble() {
-    _assertGreaterThan(_boolValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_greaterThan_unknownDouble_knownInt() {
-    _assertGreaterThan(_boolValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_greaterThan_unknownInt_knownDouble() {
-    _assertGreaterThan(_boolValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_greaterThan_unknownInt_knownInt() {
-    _assertGreaterThan(_boolValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_knownDouble_false() {
-    _assertGreaterThanOrEqual(
-        _boolValue(false), _doubleValue(1.0), _doubleValue(2.0));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_knownDouble_true() {
-    _assertGreaterThanOrEqual(
-        _boolValue(true), _doubleValue(2.0), _doubleValue(1.0));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_knownInt_false() {
-    _assertGreaterThanOrEqual(
-        _boolValue(false), _doubleValue(1.0), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_knownInt_true() {
-    _assertGreaterThanOrEqual(
-        _boolValue(true), _doubleValue(2.0), _intValue(1));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_unknownDouble() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_greaterThanOrEqual_knownDouble_unknownInt() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _doubleValue(1.0), _intValue(null));
-  }
-
-  void test_greaterThanOrEqual_knownInt_knownInt_false() {
-    _assertGreaterThanOrEqual(_boolValue(false), _intValue(1), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_knownInt_knownInt_true() {
-    _assertGreaterThanOrEqual(_boolValue(true), _intValue(2), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_knownInt_knownString() {
-    _assertGreaterThanOrEqual(null, _intValue(1), _stringValue("2"));
-  }
-
-  void test_greaterThanOrEqual_knownInt_unknownDouble() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _intValue(1), _doubleValue(null));
-  }
-
-  void test_greaterThanOrEqual_knownInt_unknownInt() {
-    _assertGreaterThanOrEqual(_boolValue(null), _intValue(1), _intValue(null));
-  }
-
-  void test_greaterThanOrEqual_knownString_knownInt() {
-    _assertGreaterThanOrEqual(null, _stringValue("1"), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_unknownDouble_knownDouble() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_greaterThanOrEqual_unknownDouble_knownInt() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_greaterThanOrEqual_unknownInt_knownDouble() {
-    _assertGreaterThanOrEqual(
-        _boolValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_greaterThanOrEqual_unknownInt_knownInt() {
-    _assertGreaterThanOrEqual(_boolValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_hasKnownValue_bool_false() {
-    expect(_boolValue(false).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_bool_true() {
-    expect(_boolValue(true).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_bool_unknown() {
-    expect(_boolValue(null).hasKnownValue, isFalse);
-  }
-
-  void test_hasKnownValue_double_known() {
-    expect(_doubleValue(2.3).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_double_unknown() {
-    expect(_doubleValue(null).hasKnownValue, isFalse);
-  }
-
-  void test_hasKnownValue_dynamic() {
-    expect(_dynamicValue().hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_int_known() {
-    expect(_intValue(23).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_int_unknown() {
-    expect(_intValue(null).hasKnownValue, isFalse);
-  }
-
-  void test_hasKnownValue_list_empty() {
-    expect(_listValue().hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_list_invalidElement() {
-    expect(_listValue([_dynamicValue]).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_list_valid() {
-    expect(_listValue([_intValue(23)]).hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_map_empty() {
-    expect(_mapValue().hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_map_invalidKey() {
-    expect(_mapValue([_dynamicValue(), _stringValue("value")]).hasKnownValue,
-        isTrue);
-  }
-
-  void test_hasKnownValue_map_invalidValue() {
-    expect(_mapValue([_stringValue("key"), _dynamicValue()]).hasKnownValue,
-        isTrue);
-  }
-
-  void test_hasKnownValue_map_valid() {
-    expect(
-        _mapValue([_stringValue("key"), _stringValue("value")]).hasKnownValue,
-        isTrue);
-  }
-
-  void test_hasKnownValue_null() {
-    expect(_nullValue().hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_num() {
-    expect(_numValue().hasKnownValue, isFalse);
-  }
-
-  void test_hasKnownValue_string_known() {
-    expect(_stringValue("twenty-three").hasKnownValue, isTrue);
-  }
-
-  void test_hasKnownValue_string_unknown() {
-    expect(_stringValue(null).hasKnownValue, isFalse);
-  }
-
-  void test_identical_bool_false() {
-    _assertIdentical(_boolValue(false), _boolValue(false), _boolValue(true));
-  }
-
-  void test_identical_bool_true() {
-    _assertIdentical(_boolValue(true), _boolValue(true), _boolValue(true));
-  }
-
-  void test_identical_bool_unknown() {
-    _assertIdentical(_boolValue(null), _boolValue(null), _boolValue(false));
-  }
-
-  void test_identical_double_false() {
-    _assertIdentical(_boolValue(false), _doubleValue(2.0), _doubleValue(4.0));
-  }
-
-  void test_identical_double_true() {
-    _assertIdentical(_boolValue(true), _doubleValue(2.0), _doubleValue(2.0));
-  }
-
-  void test_identical_double_unknown() {
-    _assertIdentical(_boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_identical_int_false() {
-    _assertIdentical(_boolValue(false), _intValue(-5), _intValue(5));
-  }
-
-  void test_identical_int_true() {
-    _assertIdentical(_boolValue(true), _intValue(5), _intValue(5));
-  }
-
-  void test_identical_int_unknown() {
-    _assertIdentical(_boolValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_identical_list_empty() {
-    _assertIdentical(_boolValue(true), _listValue(), _listValue());
-  }
-
-  void test_identical_list_false() {
-    _assertIdentical(
-        _boolValue(false), _listValue(), _listValue([_intValue(3)]));
-  }
-
-  void test_identical_map_empty() {
-    _assertIdentical(_boolValue(true), _mapValue(), _mapValue());
-  }
-
-  void test_identical_map_false() {
-    _assertIdentical(_boolValue(false), _mapValue(),
-        _mapValue([_intValue(1), _intValue(2)]));
-  }
-
-  void test_identical_null() {
-    _assertIdentical(_boolValue(true), _nullValue(), _nullValue());
-  }
-
-  void test_identical_string_false() {
-    _assertIdentical(
-        _boolValue(false), _stringValue("abc"), _stringValue("def"));
-  }
-
-  void test_identical_string_true() {
-    _assertIdentical(
-        _boolValue(true), _stringValue("abc"), _stringValue("abc"));
-  }
-
-  void test_identical_string_unknown() {
-    _assertIdentical(_boolValue(null), _stringValue(null), _stringValue("def"));
-  }
-
-  void test_integerDivide_knownDouble_knownDouble() {
-    _assertIntegerDivide(_intValue(3), _doubleValue(6.0), _doubleValue(2.0));
-  }
-
-  void test_integerDivide_knownDouble_knownInt() {
-    _assertIntegerDivide(_intValue(3), _doubleValue(6.0), _intValue(2));
-  }
-
-  void test_integerDivide_knownDouble_unknownDouble() {
-    _assertIntegerDivide(
-        _intValue(null), _doubleValue(6.0), _doubleValue(null));
-  }
-
-  void test_integerDivide_knownDouble_unknownInt() {
-    _assertIntegerDivide(_intValue(null), _doubleValue(6.0), _intValue(null));
-  }
-
-  void test_integerDivide_knownInt_knownInt() {
-    _assertIntegerDivide(_intValue(3), _intValue(6), _intValue(2));
-  }
-
-  void test_integerDivide_knownInt_knownString() {
-    _assertIntegerDivide(null, _intValue(6), _stringValue("2"));
-  }
-
-  void test_integerDivide_knownInt_unknownDouble() {
-    _assertIntegerDivide(_intValue(null), _intValue(6), _doubleValue(null));
-  }
-
-  void test_integerDivide_knownInt_unknownInt() {
-    _assertIntegerDivide(_intValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_integerDivide_knownString_knownInt() {
-    _assertIntegerDivide(null, _stringValue("6"), _intValue(2));
-  }
-
-  void test_integerDivide_unknownDouble_knownDouble() {
-    _assertIntegerDivide(
-        _intValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_integerDivide_unknownDouble_knownInt() {
-    _assertIntegerDivide(_intValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_integerDivide_unknownInt_knownDouble() {
-    _assertIntegerDivide(_intValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_integerDivide_unknownInt_knownInt() {
-    _assertIntegerDivide(_intValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_isBoolNumStringOrNull_bool_false() {
-    expect(_boolValue(false).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_bool_true() {
-    expect(_boolValue(true).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_bool_unknown() {
-    expect(_boolValue(null).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_double_known() {
-    expect(_doubleValue(2.3).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_double_unknown() {
-    expect(_doubleValue(null).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_dynamic() {
-    expect(_dynamicValue().isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_int_known() {
-    expect(_intValue(23).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_int_unknown() {
-    expect(_intValue(null).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_list() {
-    expect(_listValue().isBoolNumStringOrNull, isFalse);
-  }
-
-  void test_isBoolNumStringOrNull_null() {
-    expect(_nullValue().isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_num() {
-    expect(_numValue().isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_string_known() {
-    expect(_stringValue("twenty-three").isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_isBoolNumStringOrNull_string_unknown() {
-    expect(_stringValue(null).isBoolNumStringOrNull, isTrue);
-  }
-
-  void test_lessThan_knownDouble_knownDouble_false() {
-    _assertLessThan(_boolValue(false), _doubleValue(2.0), _doubleValue(1.0));
-  }
-
-  void test_lessThan_knownDouble_knownDouble_true() {
-    _assertLessThan(_boolValue(true), _doubleValue(1.0), _doubleValue(2.0));
-  }
-
-  void test_lessThan_knownDouble_knownInt_false() {
-    _assertLessThan(_boolValue(false), _doubleValue(2.0), _intValue(1));
-  }
-
-  void test_lessThan_knownDouble_knownInt_true() {
-    _assertLessThan(_boolValue(true), _doubleValue(1.0), _intValue(2));
-  }
-
-  void test_lessThan_knownDouble_unknownDouble() {
-    _assertLessThan(_boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_lessThan_knownDouble_unknownInt() {
-    _assertLessThan(_boolValue(null), _doubleValue(1.0), _intValue(null));
-  }
-
-  void test_lessThan_knownInt_knownInt_false() {
-    _assertLessThan(_boolValue(false), _intValue(2), _intValue(1));
-  }
-
-  void test_lessThan_knownInt_knownInt_true() {
-    _assertLessThan(_boolValue(true), _intValue(1), _intValue(2));
-  }
-
-  void test_lessThan_knownInt_knownString() {
-    _assertLessThan(null, _intValue(1), _stringValue("2"));
-  }
-
-  void test_lessThan_knownInt_unknownDouble() {
-    _assertLessThan(_boolValue(null), _intValue(1), _doubleValue(null));
-  }
-
-  void test_lessThan_knownInt_unknownInt() {
-    _assertLessThan(_boolValue(null), _intValue(1), _intValue(null));
-  }
-
-  void test_lessThan_knownString_knownInt() {
-    _assertLessThan(null, _stringValue("1"), _intValue(2));
-  }
-
-  void test_lessThan_unknownDouble_knownDouble() {
-    _assertLessThan(_boolValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_lessThan_unknownDouble_knownInt() {
-    _assertLessThan(_boolValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_lessThan_unknownInt_knownDouble() {
-    _assertLessThan(_boolValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_lessThan_unknownInt_knownInt() {
-    _assertLessThan(_boolValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_lessThanOrEqual_knownDouble_knownDouble_false() {
-    _assertLessThanOrEqual(
-        _boolValue(false), _doubleValue(2.0), _doubleValue(1.0));
-  }
-
-  void test_lessThanOrEqual_knownDouble_knownDouble_true() {
-    _assertLessThanOrEqual(
-        _boolValue(true), _doubleValue(1.0), _doubleValue(2.0));
-  }
-
-  void test_lessThanOrEqual_knownDouble_knownInt_false() {
-    _assertLessThanOrEqual(_boolValue(false), _doubleValue(2.0), _intValue(1));
-  }
-
-  void test_lessThanOrEqual_knownDouble_knownInt_true() {
-    _assertLessThanOrEqual(_boolValue(true), _doubleValue(1.0), _intValue(2));
-  }
-
-  void test_lessThanOrEqual_knownDouble_unknownDouble() {
-    _assertLessThanOrEqual(
-        _boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_lessThanOrEqual_knownDouble_unknownInt() {
-    _assertLessThanOrEqual(
-        _boolValue(null), _doubleValue(1.0), _intValue(null));
-  }
-
-  void test_lessThanOrEqual_knownInt_knownInt_false() {
-    _assertLessThanOrEqual(_boolValue(false), _intValue(2), _intValue(1));
-  }
-
-  void test_lessThanOrEqual_knownInt_knownInt_true() {
-    _assertLessThanOrEqual(_boolValue(true), _intValue(1), _intValue(2));
-  }
-
-  void test_lessThanOrEqual_knownInt_knownString() {
-    _assertLessThanOrEqual(null, _intValue(1), _stringValue("2"));
-  }
-
-  void test_lessThanOrEqual_knownInt_unknownDouble() {
-    _assertLessThanOrEqual(_boolValue(null), _intValue(1), _doubleValue(null));
-  }
-
-  void test_lessThanOrEqual_knownInt_unknownInt() {
-    _assertLessThanOrEqual(_boolValue(null), _intValue(1), _intValue(null));
-  }
-
-  void test_lessThanOrEqual_knownString_knownInt() {
-    _assertLessThanOrEqual(null, _stringValue("1"), _intValue(2));
-  }
-
-  void test_lessThanOrEqual_unknownDouble_knownDouble() {
-    _assertLessThanOrEqual(
-        _boolValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_lessThanOrEqual_unknownDouble_knownInt() {
-    _assertLessThanOrEqual(_boolValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_lessThanOrEqual_unknownInt_knownDouble() {
-    _assertLessThanOrEqual(
-        _boolValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_lessThanOrEqual_unknownInt_knownInt() {
-    _assertLessThanOrEqual(_boolValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_logicalAnd_false_false() {
-    _assertLogicalAnd(_boolValue(false), _boolValue(false), _boolValue(false));
-  }
-
-  void test_logicalAnd_false_null() {
-    try {
-      _assertLogicalAnd(_boolValue(false), _boolValue(false), _nullValue());
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_false_string() {
-    try {
-      _assertLogicalAnd(
-          _boolValue(false), _boolValue(false), _stringValue("false"));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_false_true() {
-    _assertLogicalAnd(_boolValue(false), _boolValue(false), _boolValue(true));
-  }
-
-  void test_logicalAnd_null_false() {
-    try {
-      _assertLogicalAnd(_boolValue(false), _nullValue(), _boolValue(false));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_null_true() {
-    try {
-      _assertLogicalAnd(_boolValue(false), _nullValue(), _boolValue(true));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_string_false() {
-    try {
-      _assertLogicalAnd(
-          _boolValue(false), _stringValue("true"), _boolValue(false));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_string_true() {
-    try {
-      _assertLogicalAnd(
-          _boolValue(false), _stringValue("false"), _boolValue(true));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_true_false() {
-    _assertLogicalAnd(_boolValue(false), _boolValue(true), _boolValue(false));
-  }
-
-  void test_logicalAnd_true_null() {
-    _assertLogicalAnd(null, _boolValue(true), _nullValue());
-  }
-
-  void test_logicalAnd_true_string() {
-    try {
-      _assertLogicalAnd(
-          _boolValue(false), _boolValue(true), _stringValue("true"));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalAnd_true_true() {
-    _assertLogicalAnd(_boolValue(true), _boolValue(true), _boolValue(true));
-  }
-
-  void test_logicalNot_false() {
-    _assertLogicalNot(_boolValue(true), _boolValue(false));
-  }
-
-  void test_logicalNot_null() {
-    _assertLogicalNot(null, _nullValue());
-  }
-
-  void test_logicalNot_string() {
-    try {
-      _assertLogicalNot(_boolValue(true), _stringValue(null));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalNot_true() {
-    _assertLogicalNot(_boolValue(false), _boolValue(true));
-  }
-
-  void test_logicalNot_unknown() {
-    _assertLogicalNot(_boolValue(null), _boolValue(null));
-  }
-
-  void test_logicalOr_false_false() {
-    _assertLogicalOr(_boolValue(false), _boolValue(false), _boolValue(false));
-  }
-
-  void test_logicalOr_false_null() {
-    _assertLogicalOr(null, _boolValue(false), _nullValue());
-  }
-
-  void test_logicalOr_false_string() {
-    try {
-      _assertLogicalOr(
-          _boolValue(false), _boolValue(false), _stringValue("false"));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_false_true() {
-    _assertLogicalOr(_boolValue(true), _boolValue(false), _boolValue(true));
-  }
-
-  void test_logicalOr_null_false() {
-    try {
-      _assertLogicalOr(_boolValue(false), _nullValue(), _boolValue(false));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_null_true() {
-    try {
-      _assertLogicalOr(_boolValue(true), _nullValue(), _boolValue(true));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_string_false() {
-    try {
-      _assertLogicalOr(
-          _boolValue(false), _stringValue("true"), _boolValue(false));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_string_true() {
-    try {
-      _assertLogicalOr(
-          _boolValue(true), _stringValue("false"), _boolValue(true));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_true_false() {
-    _assertLogicalOr(_boolValue(true), _boolValue(true), _boolValue(false));
-  }
-
-  void test_logicalOr_true_null() {
-    try {
-      _assertLogicalOr(_boolValue(true), _boolValue(true), _nullValue());
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_true_string() {
-    try {
-      _assertLogicalOr(
-          _boolValue(true), _boolValue(true), _stringValue("true"));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_logicalOr_true_true() {
-    _assertLogicalOr(_boolValue(true), _boolValue(true), _boolValue(true));
-  }
-
-  void test_minus_knownDouble_knownDouble() {
-    _assertMinus(_doubleValue(1.0), _doubleValue(4.0), _doubleValue(3.0));
-  }
-
-  void test_minus_knownDouble_knownInt() {
-    _assertMinus(_doubleValue(1.0), _doubleValue(4.0), _intValue(3));
-  }
-
-  void test_minus_knownDouble_unknownDouble() {
-    _assertMinus(_doubleValue(null), _doubleValue(4.0), _doubleValue(null));
-  }
-
-  void test_minus_knownDouble_unknownInt() {
-    _assertMinus(_doubleValue(null), _doubleValue(4.0), _intValue(null));
-  }
-
-  void test_minus_knownInt_knownInt() {
-    _assertMinus(_intValue(1), _intValue(4), _intValue(3));
-  }
-
-  void test_minus_knownInt_knownString() {
-    _assertMinus(null, _intValue(4), _stringValue("3"));
-  }
-
-  void test_minus_knownInt_unknownDouble() {
-    _assertMinus(_doubleValue(null), _intValue(4), _doubleValue(null));
-  }
-
-  void test_minus_knownInt_unknownInt() {
-    _assertMinus(_intValue(null), _intValue(4), _intValue(null));
-  }
-
-  void test_minus_knownString_knownInt() {
-    _assertMinus(null, _stringValue("4"), _intValue(3));
-  }
-
-  void test_minus_unknownDouble_knownDouble() {
-    _assertMinus(_doubleValue(null), _doubleValue(null), _doubleValue(3.0));
-  }
-
-  void test_minus_unknownDouble_knownInt() {
-    _assertMinus(_doubleValue(null), _doubleValue(null), _intValue(3));
-  }
-
-  void test_minus_unknownInt_knownDouble() {
-    _assertMinus(_doubleValue(null), _intValue(null), _doubleValue(3.0));
-  }
-
-  void test_minus_unknownInt_knownInt() {
-    _assertMinus(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_negated_double_known() {
-    _assertNegated(_doubleValue(2.0), _doubleValue(-2.0));
-  }
-
-  void test_negated_double_unknown() {
-    _assertNegated(_doubleValue(null), _doubleValue(null));
-  }
-
-  void test_negated_int_known() {
-    _assertNegated(_intValue(-3), _intValue(3));
-  }
-
-  void test_negated_int_unknown() {
-    _assertNegated(_intValue(null), _intValue(null));
-  }
-
-  void test_negated_string() {
-    _assertNegated(null, _stringValue(null));
-  }
-
-  void test_notEqual_bool_false() {
-    _assertNotEqual(_boolValue(false), _boolValue(true), _boolValue(true));
-  }
-
-  void test_notEqual_bool_true() {
-    _assertNotEqual(_boolValue(true), _boolValue(false), _boolValue(true));
-  }
-
-  void test_notEqual_bool_unknown() {
-    _assertNotEqual(_boolValue(null), _boolValue(null), _boolValue(false));
-  }
-
-  void test_notEqual_double_false() {
-    _assertNotEqual(_boolValue(false), _doubleValue(2.0), _doubleValue(2.0));
-  }
-
-  void test_notEqual_double_true() {
-    _assertNotEqual(_boolValue(true), _doubleValue(2.0), _doubleValue(4.0));
-  }
-
-  void test_notEqual_double_unknown() {
-    _assertNotEqual(_boolValue(null), _doubleValue(1.0), _doubleValue(null));
-  }
-
-  void test_notEqual_int_false() {
-    _assertNotEqual(_boolValue(false), _intValue(5), _intValue(5));
-  }
-
-  void test_notEqual_int_true() {
-    _assertNotEqual(_boolValue(true), _intValue(-5), _intValue(5));
-  }
-
-  void test_notEqual_int_unknown() {
-    _assertNotEqual(_boolValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_notEqual_null() {
-    _assertNotEqual(_boolValue(false), _nullValue(), _nullValue());
-  }
-
-  void test_notEqual_string_false() {
-    _assertNotEqual(
-        _boolValue(false), _stringValue("abc"), _stringValue("abc"));
-  }
-
-  void test_notEqual_string_true() {
-    _assertNotEqual(_boolValue(true), _stringValue("abc"), _stringValue("def"));
-  }
-
-  void test_notEqual_string_unknown() {
-    _assertNotEqual(_boolValue(null), _stringValue(null), _stringValue("def"));
-  }
-
-  void test_performToString_bool_false() {
-    _assertPerformToString(_stringValue("false"), _boolValue(false));
-  }
-
-  void test_performToString_bool_true() {
-    _assertPerformToString(_stringValue("true"), _boolValue(true));
-  }
-
-  void test_performToString_bool_unknown() {
-    _assertPerformToString(_stringValue(null), _boolValue(null));
-  }
-
-  void test_performToString_double_known() {
-    _assertPerformToString(_stringValue("2.0"), _doubleValue(2.0));
-  }
-
-  void test_performToString_double_unknown() {
-    _assertPerformToString(_stringValue(null), _doubleValue(null));
-  }
-
-  void test_performToString_int_known() {
-    _assertPerformToString(_stringValue("5"), _intValue(5));
-  }
-
-  void test_performToString_int_unknown() {
-    _assertPerformToString(_stringValue(null), _intValue(null));
-  }
-
-  void test_performToString_null() {
-    _assertPerformToString(_stringValue("null"), _nullValue());
-  }
-
-  void test_performToString_string_known() {
-    _assertPerformToString(_stringValue("abc"), _stringValue("abc"));
-  }
-
-  void test_performToString_string_unknown() {
-    _assertPerformToString(_stringValue(null), _stringValue(null));
-  }
-
-  void test_remainder_knownDouble_knownDouble() {
-    _assertRemainder(_doubleValue(1.0), _doubleValue(7.0), _doubleValue(2.0));
-  }
-
-  void test_remainder_knownDouble_knownInt() {
-    _assertRemainder(_doubleValue(1.0), _doubleValue(7.0), _intValue(2));
-  }
-
-  void test_remainder_knownDouble_unknownDouble() {
-    _assertRemainder(_doubleValue(null), _doubleValue(7.0), _doubleValue(null));
-  }
-
-  void test_remainder_knownDouble_unknownInt() {
-    _assertRemainder(_doubleValue(null), _doubleValue(6.0), _intValue(null));
-  }
-
-  void test_remainder_knownInt_knownInt() {
-    _assertRemainder(_intValue(1), _intValue(7), _intValue(2));
-  }
-
-  void test_remainder_knownInt_knownString() {
-    _assertRemainder(null, _intValue(7), _stringValue("2"));
-  }
-
-  void test_remainder_knownInt_unknownDouble() {
-    _assertRemainder(_doubleValue(null), _intValue(7), _doubleValue(null));
-  }
-
-  void test_remainder_knownInt_unknownInt() {
-    _assertRemainder(_intValue(null), _intValue(7), _intValue(null));
-  }
-
-  void test_remainder_knownString_knownInt() {
-    _assertRemainder(null, _stringValue("7"), _intValue(2));
-  }
-
-  void test_remainder_unknownDouble_knownDouble() {
-    _assertRemainder(_doubleValue(null), _doubleValue(null), _doubleValue(2.0));
-  }
-
-  void test_remainder_unknownDouble_knownInt() {
-    _assertRemainder(_doubleValue(null), _doubleValue(null), _intValue(2));
-  }
-
-  void test_remainder_unknownInt_knownDouble() {
-    _assertRemainder(_doubleValue(null), _intValue(null), _doubleValue(2.0));
-  }
-
-  void test_remainder_unknownInt_knownInt() {
-    _assertRemainder(_intValue(null), _intValue(null), _intValue(2));
-  }
-
-  void test_shiftLeft_knownInt_knownInt() {
-    _assertShiftLeft(_intValue(48), _intValue(6), _intValue(3));
-  }
-
-  void test_shiftLeft_knownInt_knownString() {
-    _assertShiftLeft(null, _intValue(6), _stringValue(null));
-  }
-
-  void test_shiftLeft_knownInt_tooLarge() {
-    _assertShiftLeft(
-        _intValue(null),
-        _intValue(6),
-        new DartObjectImpl(
-            _typeProvider.intType, new IntState(LONG_MAX_VALUE)));
-  }
-
-  void test_shiftLeft_knownInt_unknownInt() {
-    _assertShiftLeft(_intValue(null), _intValue(6), _intValue(null));
-  }
-
-  void test_shiftLeft_knownString_knownInt() {
-    _assertShiftLeft(null, _stringValue(null), _intValue(3));
-  }
-
-  void test_shiftLeft_unknownInt_knownInt() {
-    _assertShiftLeft(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_shiftLeft_unknownInt_unknownInt() {
-    _assertShiftLeft(_intValue(null), _intValue(null), _intValue(null));
-  }
-
-  void test_shiftRight_knownInt_knownInt() {
-    _assertShiftRight(_intValue(6), _intValue(48), _intValue(3));
-  }
-
-  void test_shiftRight_knownInt_knownString() {
-    _assertShiftRight(null, _intValue(48), _stringValue(null));
-  }
-
-  void test_shiftRight_knownInt_tooLarge() {
-    _assertShiftRight(
-        _intValue(null),
-        _intValue(48),
-        new DartObjectImpl(
-            _typeProvider.intType, new IntState(LONG_MAX_VALUE)));
-  }
-
-  void test_shiftRight_knownInt_unknownInt() {
-    _assertShiftRight(_intValue(null), _intValue(48), _intValue(null));
-  }
-
-  void test_shiftRight_knownString_knownInt() {
-    _assertShiftRight(null, _stringValue(null), _intValue(3));
-  }
-
-  void test_shiftRight_unknownInt_knownInt() {
-    _assertShiftRight(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  void test_shiftRight_unknownInt_unknownInt() {
-    _assertShiftRight(_intValue(null), _intValue(null), _intValue(null));
-  }
-
-  void test_stringLength_int() {
-    try {
-      _assertStringLength(_intValue(null), _intValue(0));
-      fail("Expected EvaluationException");
-    } on EvaluationException {}
-  }
-
-  void test_stringLength_knownString() {
-    _assertStringLength(_intValue(3), _stringValue("abc"));
-  }
-
-  void test_stringLength_unknownString() {
-    _assertStringLength(_intValue(null), _stringValue(null));
-  }
-
-  void test_times_knownDouble_knownDouble() {
-    _assertTimes(_doubleValue(6.0), _doubleValue(2.0), _doubleValue(3.0));
-  }
-
-  void test_times_knownDouble_knownInt() {
-    _assertTimes(_doubleValue(6.0), _doubleValue(2.0), _intValue(3));
-  }
-
-  void test_times_knownDouble_unknownDouble() {
-    _assertTimes(_doubleValue(null), _doubleValue(2.0), _doubleValue(null));
-  }
-
-  void test_times_knownDouble_unknownInt() {
-    _assertTimes(_doubleValue(null), _doubleValue(2.0), _intValue(null));
-  }
-
-  void test_times_knownInt_knownInt() {
-    _assertTimes(_intValue(6), _intValue(2), _intValue(3));
-  }
-
-  void test_times_knownInt_knownString() {
-    _assertTimes(null, _intValue(2), _stringValue("3"));
-  }
-
-  void test_times_knownInt_unknownDouble() {
-    _assertTimes(_doubleValue(null), _intValue(2), _doubleValue(null));
-  }
-
-  void test_times_knownInt_unknownInt() {
-    _assertTimes(_intValue(null), _intValue(2), _intValue(null));
-  }
-
-  void test_times_knownString_knownInt() {
-    _assertTimes(null, _stringValue("2"), _intValue(3));
-  }
-
-  void test_times_unknownDouble_knownDouble() {
-    _assertTimes(_doubleValue(null), _doubleValue(null), _doubleValue(3.0));
-  }
-
-  void test_times_unknownDouble_knownInt() {
-    _assertTimes(_doubleValue(null), _doubleValue(null), _intValue(3));
-  }
-
-  void test_times_unknownInt_knownDouble() {
-    _assertTimes(_doubleValue(null), _intValue(null), _doubleValue(3.0));
-  }
-
-  void test_times_unknownInt_knownInt() {
-    _assertTimes(_intValue(null), _intValue(null), _intValue(3));
-  }
-
-  /**
-   * Assert that the result of adding the left and right operands is the expected value, or that the
-   * operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertAdd(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.add(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.add(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of bit-anding the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertBitAnd(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.bitAnd(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.bitAnd(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the bit-not of the operand is the expected value, or that the operation throws an
-   * exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param operand the operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertBitNot(DartObjectImpl expected, DartObjectImpl operand) {
-    if (expected == null) {
-      try {
-        operand.bitNot(_typeProvider);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = operand.bitNot(_typeProvider);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of bit-oring the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertBitOr(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.bitOr(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.bitOr(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of bit-xoring the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertBitXor(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.bitXor(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.bitXor(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of concatenating the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertConcatenate(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.concatenate(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.concatenate(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of dividing the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertDivide(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.divide(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.divide(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands for equality is the expected
-   * value, or that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertEqualEqual(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.equalEqual(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.equalEqual(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertGreaterThan(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.greaterThan(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.greaterThan(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertGreaterThanOrEqual(DartObjectImpl expected,
-      DartObjectImpl leftOperand, DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.greaterThanOrEqual(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.greaterThanOrEqual(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands using
-   * identical() is the expected value.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   */
-  void _assertIdentical(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    DartObjectImpl result =
-        leftOperand.isIdentical(_typeProvider, rightOperand);
-    expect(result, isNotNull);
-    expect(result, expected);
-  }
-
-  void _assertInstanceOfObjectArray(Object result) {
-    // TODO(scheglov) implement
-  }
-
-  /**
-   * Assert that the result of dividing the left and right operands as integers is the expected
-   * value, or that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertIntegerDivide(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.integerDivide(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.integerDivide(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertLessThan(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.lessThan(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.lessThan(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands is the expected value, or that
-   * the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertLessThanOrEqual(DartObjectImpl expected,
-      DartObjectImpl leftOperand, DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.lessThanOrEqual(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.lessThanOrEqual(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of logical-anding the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertLogicalAnd(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.logicalAnd(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.logicalAnd(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the logical-not of the operand is the expected value, or that the operation throws
-   * an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param operand the operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertLogicalNot(DartObjectImpl expected, DartObjectImpl operand) {
-    if (expected == null) {
-      try {
-        operand.logicalNot(_typeProvider);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = operand.logicalNot(_typeProvider);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of logical-oring the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertLogicalOr(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.logicalOr(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.logicalOr(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of subtracting the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertMinus(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.minus(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.minus(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the negation of the operand is the expected value, or that the operation throws an
-   * exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param operand the operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertNegated(DartObjectImpl expected, DartObjectImpl operand) {
-    if (expected == null) {
-      try {
-        operand.negated(_typeProvider);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = operand.negated(_typeProvider);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of comparing the left and right operands for inequality is the expected
-   * value, or that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertNotEqual(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.notEqual(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.notEqual(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that converting the operand to a string is the expected value, or that the operation
-   * throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param operand the operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertPerformToString(DartObjectImpl expected, DartObjectImpl operand) {
-    if (expected == null) {
-      try {
-        operand.performToString(_typeProvider);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = operand.performToString(_typeProvider);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of taking the remainder of the left and right operands is the expected
-   * value, or that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertRemainder(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.remainder(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.remainder(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of multiplying the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertShiftLeft(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.shiftLeft(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.shiftLeft(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of multiplying the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the right operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertShiftRight(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.shiftRight(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result =
-          leftOperand.shiftRight(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the length of the operand is the expected value, or that the operation throws an
-   * exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param operand the operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertStringLength(DartObjectImpl expected, DartObjectImpl operand) {
-    if (expected == null) {
-      try {
-        operand.stringLength(_typeProvider);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = operand.stringLength(_typeProvider);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  /**
-   * Assert that the result of multiplying the left and right operands is the expected value, or
-   * that the operation throws an exception if the expected value is `null`.
-   *
-   * @param expected the expected result of the operation
-   * @param leftOperand the left operand to the operation
-   * @param rightOperand the left operand to the operation
-   * @throws EvaluationException if the result is an exception when it should not be
-   */
-  void _assertTimes(DartObjectImpl expected, DartObjectImpl leftOperand,
-      DartObjectImpl rightOperand) {
-    if (expected == null) {
-      try {
-        leftOperand.times(_typeProvider, rightOperand);
-        fail("Expected an EvaluationException");
-      } on EvaluationException {}
-    } else {
-      DartObjectImpl result = leftOperand.times(_typeProvider, rightOperand);
-      expect(result, isNotNull);
-      expect(result, expected);
-    }
-  }
-
-  DartObjectImpl _boolValue(bool value) {
-    if (value == null) {
-      return new DartObjectImpl(
-          _typeProvider.boolType, BoolState.UNKNOWN_VALUE);
-    } else if (identical(value, false)) {
-      return new DartObjectImpl(_typeProvider.boolType, BoolState.FALSE_STATE);
-    } else if (identical(value, true)) {
-      return new DartObjectImpl(_typeProvider.boolType, BoolState.TRUE_STATE);
-    }
-    fail("Invalid boolean value used in test");
-    return null;
-  }
-
-  DartObjectImpl _doubleValue(double value) {
-    if (value == null) {
-      return new DartObjectImpl(
-          _typeProvider.doubleType, DoubleState.UNKNOWN_VALUE);
-    } else {
-      return new DartObjectImpl(
-          _typeProvider.doubleType, new DoubleState(value));
-    }
-  }
-
-  DartObjectImpl _dynamicValue() {
-    return new DartObjectImpl(
-        _typeProvider.nullType, DynamicState.DYNAMIC_STATE);
-  }
-
-  DartObjectImpl _intValue(int value) {
-    if (value == null) {
-      return new DartObjectImpl(_typeProvider.intType, IntState.UNKNOWN_VALUE);
-    } else {
-      return new DartObjectImpl(_typeProvider.intType, new IntState(value));
-    }
-  }
-
-  DartObjectImpl _listValue(
-      [List<DartObjectImpl> elements = DartObjectImpl.EMPTY_LIST]) {
-    return new DartObjectImpl(_typeProvider.listType, new ListState(elements));
-  }
-
-  DartObjectImpl _mapValue(
-      [List<DartObjectImpl> keyElementPairs = DartObjectImpl.EMPTY_LIST]) {
-    Map<DartObjectImpl, DartObjectImpl> map =
-        new Map<DartObjectImpl, DartObjectImpl>();
-    int count = keyElementPairs.length;
-    for (int i = 0; i < count;) {
-      map[keyElementPairs[i++]] = keyElementPairs[i++];
-    }
-    return new DartObjectImpl(_typeProvider.mapType, new MapState(map));
-  }
-
-  DartObjectImpl _nullValue() {
-    return new DartObjectImpl(_typeProvider.nullType, NullState.NULL_STATE);
-  }
-
-  DartObjectImpl _numValue() {
-    return new DartObjectImpl(_typeProvider.nullType, NumState.UNKNOWN_VALUE);
-  }
-
-  DartObjectImpl _stringValue(String value) {
-    if (value == null) {
-      return new DartObjectImpl(
-          _typeProvider.stringType, StringState.UNKNOWN_VALUE);
-    } else {
-      return new DartObjectImpl(
-          _typeProvider.stringType, new StringState(value));
-    }
-  }
-
-  DartObjectImpl _symbolValue(String value) {
-    return new DartObjectImpl(_typeProvider.symbolType, new SymbolState(value));
-  }
-}
-
-@reflectiveTest
-class DeclaredVariablesTest extends EngineTestCase {
-  void test_getBool_false() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, "false");
-    DartObject object = variables.getBool(typeProvider, variableName);
-    expect(object, isNotNull);
-    expect(object.toBoolValue(), false);
-  }
-
-  void test_getBool_invalid() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, "not true");
-    _assertNullDartObject(
-        typeProvider, variables.getBool(typeProvider, variableName));
-  }
-
-  void test_getBool_true() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, "true");
-    DartObject object = variables.getBool(typeProvider, variableName);
-    expect(object, isNotNull);
-    expect(object.toBoolValue(), true);
-  }
-
-  void test_getBool_undefined() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    _assertUnknownDartObject(
-        typeProvider.boolType, variables.getBool(typeProvider, variableName));
-  }
-
-  void test_getInt_invalid() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, "four score and seven years");
-    _assertNullDartObject(
-        typeProvider, variables.getInt(typeProvider, variableName));
-  }
-
-  void test_getInt_undefined() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    _assertUnknownDartObject(
-        typeProvider.intType, variables.getInt(typeProvider, variableName));
-  }
-
-  void test_getInt_valid() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, "23");
-    DartObject object = variables.getInt(typeProvider, variableName);
-    expect(object, isNotNull);
-    expect(object.toIntValue(), 23);
-  }
-
-  void test_getString_defined() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    String value = "value";
-    DeclaredVariables variables = new DeclaredVariables();
-    variables.define(variableName, value);
-    DartObject object = variables.getString(typeProvider, variableName);
-    expect(object, isNotNull);
-    expect(object.toStringValue(), value);
-  }
-
-  void test_getString_undefined() {
-    TestTypeProvider typeProvider = new TestTypeProvider();
-    String variableName = "var";
-    DeclaredVariables variables = new DeclaredVariables();
-    _assertUnknownDartObject(typeProvider.stringType,
-        variables.getString(typeProvider, variableName));
-  }
-
-  void _assertNullDartObject(TestTypeProvider typeProvider, DartObject result) {
-    expect(result.type, typeProvider.nullType);
-  }
-
-  void _assertUnknownDartObject(
-      ParameterizedType expectedType, DartObject result) {
-    expect((result as DartObjectImpl).isUnknown, isTrue);
-    expect(result.type, expectedType);
-  }
-}
-
-@reflectiveTest
-class ReferenceFinderTest {
-  DirectedGraph<ConstantEvaluationTarget> _referenceGraph;
-  VariableElement _head;
-  Element _tail;
-
-  void setUp() {
-    _referenceGraph = new DirectedGraph<ConstantEvaluationTarget>();
-    _head = ElementFactory.topLevelVariableElement2("v1");
-  }
-
-  void test_visitSimpleIdentifier_const() {
-    _visitNode(_makeTailVariable("v2", true));
-    _assertOneArc(_tail);
-  }
-
-  void test_visitSuperConstructorInvocation_const() {
-    _visitNode(_makeTailSuperConstructorInvocation("A", true));
-    _assertOneArc(_tail);
-  }
-
-  void test_visitSuperConstructorInvocation_nonConst() {
-    _visitNode(_makeTailSuperConstructorInvocation("A", false));
-    _assertOneArc(_tail);
-  }
-
-  void test_visitSuperConstructorInvocation_unresolved() {
-    SuperConstructorInvocation superConstructorInvocation =
-        AstFactory.superConstructorInvocation();
-    _visitNode(superConstructorInvocation);
-    _assertNoArcs();
-  }
-
-  void _assertNoArcs() {
-    Set<ConstantEvaluationTarget> tails = _referenceGraph.getTails(_head);
-    expect(tails, hasLength(0));
-  }
-
-  void _assertOneArc(Element tail) {
-    Set<ConstantEvaluationTarget> tails = _referenceGraph.getTails(_head);
-    expect(tails, hasLength(1));
-    expect(tails.first, same(tail));
-  }
-
-  ReferenceFinder _createReferenceFinder(ConstantEvaluationTarget source) =>
-      new ReferenceFinder((ConstantEvaluationTarget dependency) {
-        _referenceGraph.addEdge(source, dependency);
-      });
-  SuperConstructorInvocation _makeTailSuperConstructorInvocation(
-      String name, bool isConst) {
-    List<ConstructorInitializer> initializers =
-        new List<ConstructorInitializer>();
-    ConstructorDeclaration constructorDeclaration =
-        AstFactory.constructorDeclaration(AstFactory.identifier3(name), null,
-            AstFactory.formalParameterList(), initializers);
-    if (isConst) {
-      constructorDeclaration.constKeyword = new KeywordToken(Keyword.CONST, 0);
-    }
-    ClassElementImpl classElement = ElementFactory.classElement2(name);
-    SuperConstructorInvocation superConstructorInvocation =
-        AstFactory.superConstructorInvocation();
-    ConstructorElementImpl constructorElement =
-        ElementFactory.constructorElement(classElement, name, isConst);
-    _tail = constructorElement;
-    superConstructorInvocation.staticElement = constructorElement;
-    return superConstructorInvocation;
-  }
-
-  SimpleIdentifier _makeTailVariable(String name, bool isConst) {
-    VariableDeclaration variableDeclaration =
-        AstFactory.variableDeclaration(name);
-    ConstLocalVariableElementImpl variableElement =
-        ElementFactory.constLocalVariableElement(name);
-    _tail = variableElement;
-    variableElement.const3 = isConst;
-    AstFactory.variableDeclarationList2(
-        isConst ? Keyword.CONST : Keyword.VAR, [variableDeclaration]);
-    SimpleIdentifier identifier = AstFactory.identifier3(name);
-    identifier.staticElement = variableElement;
-    return identifier;
-  }
-
-  void _visitNode(AstNode node) {
-    node.accept(_createReferenceFinder(_head));
-  }
-}
-
-class _TestAnalysisContext extends TestAnalysisContext {
-  @override
-  InternalAnalysisContext getContextFor(Source source) => this;
-}