Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/analyzer/test/src/task/dart_test.dart

+// Copyright (c) 2015, 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 test.src.task.dart_test;
+
+import 'package:analyzer/src/context/cache.dart';
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/constant.dart';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/engine.dart'
+    show AnalysisOptionsImpl, CacheState;
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/resolver.dart';
+import 'package:analyzer/src/generated/scanner.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/task/dart.dart';
+import 'package:analyzer/src/task/html.dart';
+import 'package:analyzer/task/dart.dart';
+import 'package:analyzer/task/general.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../generated/test_support.dart';
+import '../../reflective_tests.dart';
+import '../../utils.dart';
+import '../context/abstract_context.dart';
+
+main() {
+  initializeTestEnvironment();
+  runReflectiveTests(BuildCompilationUnitElementTaskTest);
+  runReflectiveTests(BuildDirectiveElementsTaskTest);
+  runReflectiveTests(BuildEnumMemberElementsTaskTest);
+  runReflectiveTests(BuildSourceExportClosureTaskTest);
+  runReflectiveTests(BuildSourceImportExportClosureTaskTest);
+  runReflectiveTests(BuildExportNamespaceTaskTest);
+  runReflectiveTests(BuildLibraryElementTaskTest);
+  runReflectiveTests(BuildPublicNamespaceTaskTest);
+  runReflectiveTests(BuildTypeProviderTaskTest);
+  runReflectiveTests(ComputeConstantDependenciesTaskTest);
+  runReflectiveTests(ComputeConstantValueTaskTest);
+  runReflectiveTests(ComputeInferableStaticVariableDependenciesTaskTest);
+  runReflectiveTests(ContainingLibrariesTaskTest);
+  runReflectiveTests(DartErrorsTaskTest);
+  runReflectiveTests(EvaluateUnitConstantsTaskTest);
+  runReflectiveTests(GatherUsedImportedElementsTaskTest);
+  runReflectiveTests(GatherUsedLocalElementsTaskTest);
+  runReflectiveTests(GenerateHintsTaskTest);
+  runReflectiveTests(InferStaticVariableTypesInUnitTaskTest);
+  runReflectiveTests(InferStaticVariableTypeTaskTest);
+  runReflectiveTests(LibraryErrorsReadyTaskTest);
+  runReflectiveTests(LibraryUnitErrorsTaskTest);
+  runReflectiveTests(ParseDartTaskTest);
+  runReflectiveTests(PartiallyResolveReferencesTaskTest);
+  runReflectiveTests(ResolveUnitTypeNamesTaskTest);
+  runReflectiveTests(ResolveLibraryTypeNamesTaskTest);
+  runReflectiveTests(ResolveReferencesTaskTest);
+  runReflectiveTests(ResolveVariableReferencesTaskTest);
+  runReflectiveTests(ScanDartTaskTest);
+  runReflectiveTests(VerifyUnitTaskTest);
+}
+
+@reflectiveTest
+class BuildCompilationUnitElementTaskTest extends _AbstractDartTaskTest {
+  Source source;
+  LibrarySpecificUnit target;
+
+  test_buildInputs() {
+    LibrarySpecificUnit target =
+        new LibrarySpecificUnit(emptySource, emptySource);
+    Map<String, TaskInput> inputs =
+        BuildCompilationUnitElementTask.buildInputs(target);
+    expect(inputs, isNotNull);
+    expect(
+        inputs.keys,
+        unorderedEquals(
+            [BuildCompilationUnitElementTask.PARSED_UNIT_INPUT_NAME]));
+  }
+
+  test_constructor() {
+    BuildCompilationUnitElementTask task =
+        new BuildCompilationUnitElementTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    BuildCompilationUnitElementTask task =
+        BuildCompilationUnitElementTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    BuildCompilationUnitElementTask task =
+        new BuildCompilationUnitElementTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = BuildCompilationUnitElementTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform_find_constants() {
+    _performBuildTask('''
+const x = 1;
+class C {
+  static const y = 1;
+  const C([p = 1]);
+}
+@x
+f() {
+  const z = 1;
+}
+''');
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    CompilationUnitElement unitElement = outputs[COMPILATION_UNIT_ELEMENT];
+    Annotation annotation = unit.declarations
+        .firstWhere((m) => m is FunctionDeclaration)
+        .metadata[0];
+    List<ConstantEvaluationTarget> expectedConstants = [
+      unitElement.accessors.firstWhere((e) => e.isGetter).variable,
+      unitElement.types[0].fields[0],
+      unitElement.functions[0].localVariables[0],
+      unitElement.types[0].constructors[0],
+      new ConstantEvaluationTarget_Annotation(
+          context, source, source, annotation),
+      unitElement.types[0].constructors[0].parameters[0]
+    ];
+    expect(
+        outputs[COMPILATION_UNIT_CONSTANTS].toSet(), expectedConstants.toSet());
+  }
+
+  test_perform_library() {
+    _performBuildTask(r'''
+library lib;
+import 'lib2.dart';
+export 'lib3.dart';
+part 'part.dart';
+final x = '';
+class A {
+  static final y = 0;
+}
+class B = Object with A;
+''');
+    expect(outputs, hasLength(3));
+    expect(outputs[COMPILATION_UNIT_CONSTANTS], isNotNull);
+    expect(outputs[COMPILATION_UNIT_ELEMENT], isNotNull);
+    expect(outputs[RESOLVED_UNIT1], isNotNull);
+  }
+
+  test_perform_reuseElement() {
+    _performBuildTask(r'''
+library lib;
+class A {}
+class B = Object with A;
+''');
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    CompilationUnitElement unitElement = outputs[COMPILATION_UNIT_ELEMENT];
+    expect(unit, isNotNull);
+    expect(unitElement, isNotNull);
+    // invalidate RESOLVED_UNIT1
+    CacheEntry cacheEntry = analysisCache.get(target);
+    cacheEntry.setState(RESOLVED_UNIT1, CacheState.INVALID);
+    // compute again
+    computeResult(target, RESOLVED_UNIT1);
+    expect(outputs[COMPILATION_UNIT_ELEMENT], same(unitElement));
+    expect(outputs[RESOLVED_UNIT1], isNot(same(unit)));
+  }
+
+  void _performBuildTask(String content) {
+    source = newSource('/test.dart', content);
+    target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT1);
+    expect(task, new isInstanceOf<BuildCompilationUnitElementTask>());
+  }
+}
+
+@reflectiveTest
+class BuildDirectiveElementsTaskTest extends _AbstractDartTaskTest {
+  test_constructor() {
+    BuildDirectiveElementsTask task =
+        new BuildDirectiveElementsTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    BuildDirectiveElementsTask task =
+        BuildDirectiveElementsTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    BuildDirectiveElementsTask task =
+        new BuildDirectiveElementsTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = BuildDirectiveElementsTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform() {
+    List<Source> sources = newSources({
+      '/libA.dart': '''
+library libA;
+import 'libB.dart';
+export 'libC.dart';
+''',
+      '/libB.dart': '''
+library libB;
+''',
+      '/libC.dart': '''
+library libC;
+'''
+    });
+    Source sourceA = sources[0];
+    Source sourceB = sources[1];
+    Source sourceC = sources[2];
+    // perform task
+    computeResult(sourceA, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    LibraryElement libraryElementA = outputs[LIBRARY_ELEMENT2];
+    LibraryElement libraryElementB = _getImportLibraryInput(sourceB);
+    LibraryElement libraryElementC = _getExportLibraryInput(sourceC);
+    // no errors
+    _assertErrorsWithCodes([]);
+    // validate directives
+    CompilationUnit libraryUnitA = context
+        .getCacheEntry(new LibrarySpecificUnit(sourceA, sourceA))
+        .getValue(RESOLVED_UNIT1);
+    {
+      ImportDirective importNode = libraryUnitA.directives[1];
+      ImportElement importElement = importNode.element;
+      expect(importElement, isNotNull);
+      expect(importElement.importedLibrary, libraryElementB);
+      expect(importElement.prefix, isNull);
+      expect(importElement.nameOffset, 14);
+      expect(importElement.uriOffset, 21);
+      expect(importElement.uriEnd, 32);
+    }
+    {
+      ExportDirective exportNode = libraryUnitA.directives[2];
+      ExportElement exportElement = exportNode.element;
+      expect(exportElement, isNotNull);
+      expect(exportElement.exportedLibrary, libraryElementC);
+      expect(exportElement.nameOffset, 34);
+      expect(exportElement.uriOffset, 41);
+      expect(exportElement.uriEnd, 52);
+    }
+    // validate LibraryElement
+    expect(libraryElementA.hasExtUri, isFalse);
+    // has an artificial "dart:core" import
+    {
+      List<ImportElement> imports = libraryElementA.imports;
+      expect(imports, hasLength(2));
+      expect(imports[1].importedLibrary.isDartCore, isTrue);
+      expect(imports[1].isSynthetic, isTrue);
+    }
+  }
+
+  test_perform_combinators() {
+    List<Source> sources = newSources({
+      '/libA.dart': '''
+library libA;
+import 'libB.dart' show A, B hide C, D;
+''',
+      '/libB.dart': '''
+library libB;
+'''
+    });
+    Source sourceA = sources[0];
+    // perform task
+    computeResult(sourceA, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    CompilationUnit libraryUnitA = context
+        .getCacheEntry(new LibrarySpecificUnit(sourceA, sourceA))
+        .getValue(RESOLVED_UNIT1);
+    // no errors
+    _assertErrorsWithCodes([]);
+    // validate directives
+    ImportDirective importNode = libraryUnitA.directives[1];
+    ImportElement importElement = importNode.element;
+    List<NamespaceCombinator> combinators = importElement.combinators;
+    expect(combinators, hasLength(2));
+    {
+      ShowElementCombinator combinator = combinators[0];
+      expect(combinator.offset, 33);
+      expect(combinator.end, 42);
+      expect(combinator.shownNames, ['A', 'B']);
+    }
+    {
+      HideElementCombinator combinator = combinators[1];
+      expect(combinator.hiddenNames, ['C', 'D']);
+    }
+  }
+
+  test_perform_dartCoreContext() {
+    List<Source> sources = newSources({'/libA.dart': ''});
+    Source source = sources[0];
+    // perform task
+    computeResult(source, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    LibraryElement libraryElement = outputs[LIBRARY_ELEMENT2];
+    // verify that dart:core has SDK context
+    {
+      LibraryElement coreLibrary = libraryElement.importedLibraries[0];
+      DartSdk dartSdk = context.sourceFactory.dartSdk;
+      expect(coreLibrary.context, same(dartSdk.context));
+    }
+  }
+
+  test_perform_error_exportOfNonLibrary() {
+    List<Source> sources = newSources({
+      '/libA.dart': '''
+library libA;
+export 'part.dart';
+''',
+      '/part.dart': '''
+part of notLib;
+'''
+    });
+    Source sourceA = sources[0];
+    // perform task
+    computeResult(sourceA, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // validate errors
+    _assertErrorsWithCodes([CompileTimeErrorCode.EXPORT_OF_NON_LIBRARY]);
+  }
+
+  test_perform_error_importOfNonLibrary() {
+    List<Source> sources = newSources({
+      '/libA.dart': '''
+library libA;
+import 'part.dart';
+''',
+      '/part.dart': '''
+part of notLib;
+'''
+    });
+    Source sourceA = sources[0];
+    // perform task
+    computeResult(sourceA, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // validate errors
+    _assertErrorsWithCodes([CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY]);
+  }
+
+  test_perform_explicitDartCoreImport() {
+    List<Source> sources = newSources({
+      '/lib.dart': '''
+library lib;
+import 'dart:core' show List;
+'''
+    });
+    Source source = sources[0];
+    // perform task
+    computeResult(source, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    LibraryElement libraryElement = outputs[LIBRARY_ELEMENT2];
+    // has an explicit "dart:core" import
+    {
+      List<ImportElement> imports = libraryElement.imports;
+      expect(imports, hasLength(1));
+      expect(imports[0].importedLibrary.isDartCore, isTrue);
+      expect(imports[0].isSynthetic, isFalse);
+    }
+  }
+
+  test_perform_hasExtUri() {
+    List<Source> sources = newSources({
+      '/lib.dart': '''
+import 'dart-ext:doesNotExist.dart';
+'''
+    });
+    Source source = sources[0];
+    // perform task
+    computeResult(source, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    LibraryElement libraryElement = outputs[LIBRARY_ELEMENT2];
+    expect(libraryElement.hasExtUri, isTrue);
+  }
+
+  test_perform_importPrefix() {
+    List<Source> sources = newSources({
+      '/libA.dart': '''
+library libA;
+import 'libB.dart' as pref;
+import 'libC.dart' as pref;
+''',
+      '/libB.dart': '''
+library libB;
+''',
+      '/libC.dart': '''
+library libC;
+'''
+    });
+    Source sourceA = sources[0];
+    Source sourceB = sources[1];
+    // perform task
+    computeResult(sourceA, LIBRARY_ELEMENT2);
+    expect(task, new isInstanceOf<BuildDirectiveElementsTask>());
+    // prepare outputs
+    CompilationUnit libraryUnitA = context
+        .getCacheEntry(new LibrarySpecificUnit(sourceA, sourceA))
+        .getValue(RESOLVED_UNIT1);
+    // validate directives
+    {
+      ImportDirective importNodeB = libraryUnitA.directives[1];
+      SimpleIdentifier prefixNodeB = importNodeB.prefix;
+      ImportElement importElementB = importNodeB.element;
+      PrefixElement prefixElement = importElementB.prefix;
+      expect(importElementB, isNotNull);
+      expect(importElementB.importedLibrary, _getImportLibraryInput(sourceB));
+      expect(prefixElement, isNotNull);
+      expect(importElementB.prefixOffset, prefixElement.nameOffset);
+      expect(prefixNodeB.staticElement, prefixElement);
+      // PrefixElement "pref" is shared
+      ImportDirective importNodeC = libraryUnitA.directives[2];
+      SimpleIdentifier prefixNodeC = importNodeC.prefix;
+      ImportElement importElementC = importNodeC.element;
+      expect(prefixNodeC.staticElement, prefixElement);
+      expect(importElementC.prefix, prefixElement);
+    }
+  }
+
+  void _assertErrorsWithCodes(List<ErrorCode> expectedErrorCodes) {
+    _fillErrorListener(BUILD_DIRECTIVES_ERRORS);
+    errorListener.assertErrorsWithCodes(expectedErrorCodes);
+  }
+
+  _getExportLibraryInput(Source source) {
+    var key = BuildDirectiveElementsTask.EXPORTS_LIBRARY_ELEMENT_INPUT_NAME;
+    return task.inputs[key][source];
+  }
+
+  _getImportLibraryInput(Source source) {
+    var key = BuildDirectiveElementsTask.IMPORTS_LIBRARY_ELEMENT_INPUT_NAME;
+    return task.inputs[key][source];
+  }
+}
+
+@reflectiveTest
+class BuildEnumMemberElementsTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+enum MyEnum {
+  A, B
+}
+''');
+    computeResult(new LibrarySpecificUnit(source, source), RESOLVED_UNIT2);
+    expect(task, new isInstanceOf<BuildEnumMemberElementsTask>());
+    CompilationUnit unit = outputs[RESOLVED_UNIT2];
+    // validate Element
+    ClassElement enumElement = unit.element.getEnum('MyEnum');
+    List<FieldElement> fields = enumElement.fields;
+    expect(fields, hasLength(4));
+    {
+      FieldElementImpl index = fields[0];
+      expect(index, isNotNull);
+      expect(index.name, 'index');
+      expect(index.isStatic, isFalse);
+      expect(index.evaluationResult, isNull);
+      _assertGetter(index);
+    }
+    {
+      ConstFieldElementImpl values = fields[1];
+      expect(values, isNotNull);
+      expect(values.name, 'values');
+      expect(values.isStatic, isTrue);
+      expect(values.evaluationResult, isNotNull);
+      _assertGetter(values);
+    }
+    {
+      ConstFieldElementImpl constant = fields[2];
+      expect(constant, isNotNull);
+      expect(constant.name, 'A');
+      expect(constant.isStatic, isTrue);
+      expect(constant.evaluationResult, isNotNull);
+      _assertGetter(constant);
+    }
+    {
+      ConstFieldElementImpl constant = fields[3];
+      expect(constant, isNotNull);
+      expect(constant.name, 'B');
+      expect(constant.isStatic, isTrue);
+      expect(constant.evaluationResult, isNotNull);
+      _assertGetter(constant);
+    }
+    // validate nodes
+    EnumDeclaration enumNode = unit.declarations[0];
+    expect(enumNode.name.staticElement, same(enumElement));
+    expect(enumNode.constants[0].element, same(enumElement.getField('A')));
+    expect(enumNode.constants[1].element, same(enumElement.getField('B')));
+  }
+
+  static void _assertGetter(FieldElement field) {
+    PropertyAccessorElement getter = field.getter;
+    expect(getter, isNotNull);
+    expect(getter.variable, same(field));
+    expect(getter.type, isNotNull);
+  }
+}
+
+@reflectiveTest
+class BuildExportNamespaceTaskTest extends _AbstractDartTaskTest {
+  test_perform_entryPoint() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+export 'b.dart';
+''');
+    Source sourceB = newSource(
+        '/b.dart',
+        '''
+library lib_b;
+main() {}
+''');
+    computeResult(sourceA, LIBRARY_ELEMENT4);
+    expect(task, new isInstanceOf<BuildExportNamespaceTask>());
+    // validate
+    {
+      LibraryElement library = outputs[LIBRARY_ELEMENT4];
+      FunctionElement entryPoint = library.entryPoint;
+      expect(entryPoint, isNotNull);
+      expect(entryPoint.source, sourceB);
+    }
+  }
+
+  test_perform_hideCombinator() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+export 'b.dart' hide B1;
+class A1 {}
+class A2 {}
+class _A3 {}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library lib_b;
+class B1 {}
+class B2 {}
+class B3 {}
+class _B4 {}
+''');
+    newSource(
+        '/c.dart',
+        '''
+library lib_c;
+class C1 {}
+class C2 {}
+class C3 {}
+''');
+    computeResult(sourceA, LIBRARY_ELEMENT4);
+    expect(task, new isInstanceOf<BuildExportNamespaceTask>());
+    // validate
+    {
+      LibraryElement library = outputs[LIBRARY_ELEMENT4];
+      Namespace namespace = library.exportNamespace;
+      Iterable<String> definedKeys = namespace.definedNames.keys;
+      expect(definedKeys, unorderedEquals(['A1', 'A2', 'B2', 'B3']));
+    }
+  }
+
+  test_perform_showCombinator() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+export 'b.dart' show B1;
+class A1 {}
+class A2 {}
+class _A3 {}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library lib_b;
+class B1 {}
+class B2 {}
+class _B3 {}
+''');
+    computeResult(sourceA, LIBRARY_ELEMENT4);
+    expect(task, new isInstanceOf<BuildExportNamespaceTask>());
+    // validate
+    {
+      LibraryElement library = outputs[LIBRARY_ELEMENT4];
+      Namespace namespace = library.exportNamespace;
+      Iterable<String> definedKeys = namespace.definedNames.keys;
+      expect(definedKeys, unorderedEquals(['A1', 'A2', 'B1']));
+    }
+  }
+
+  test_perform_showCombinator_setter() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+export 'b.dart' show topLevelB;
+class A {}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library lib_b;
+int topLevelB;
+''');
+    computeResult(sourceA, LIBRARY_ELEMENT4);
+    expect(task, new isInstanceOf<BuildExportNamespaceTask>());
+    // validate
+    {
+      LibraryElement library = outputs[LIBRARY_ELEMENT4];
+      Namespace namespace = library.exportNamespace;
+      Iterable<String> definedKeys = namespace.definedNames.keys;
+      expect(definedKeys, unorderedEquals(['A', 'topLevelB', 'topLevelB=']));
+    }
+  }
+}
+
+@reflectiveTest
+class BuildLibraryElementTaskTest extends _AbstractDartTaskTest {
+  Source librarySource;
+  CompilationUnit libraryUnit;
+  CompilationUnitElement libraryUnitElement;
+  List<CompilationUnit> partUnits;
+
+  LibraryElement libraryElement;
+
+  test_constructor() {
+    BuildLibraryElementTask task =
+        new BuildLibraryElementTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    BuildLibraryElementTask task =
+        BuildLibraryElementTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    BuildLibraryElementTask task =
+        new BuildLibraryElementTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = BuildLibraryElementTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part1.dart';
+part 'part2.dart';
+''',
+      '/part1.dart': '''
+part of lib;
+''',
+      '/part2.dart': '''
+part of lib;
+'''
+    });
+    expect(outputs, hasLength(3));
+    // simple outputs
+    expect(outputs[BUILD_LIBRARY_ERRORS], isEmpty);
+    expect(outputs[IS_LAUNCHABLE], isFalse);
+    // LibraryElement output
+    expect(libraryElement, isNotNull);
+    expect(libraryElement.entryPoint, isNull);
+    expect(libraryElement.source, same(librarySource));
+    expect(libraryElement.definingCompilationUnit, libraryUnitElement);
+    expect(libraryElement.parts,
+        unorderedEquals([partUnits[0].element, partUnits[1].element]));
+    // LibraryElement references
+    expect((libraryUnit.directives[0] as LibraryDirective).element,
+        same(libraryElement));
+    expect((partUnits[0].directives[0] as PartOfDirective).element,
+        same(libraryElement));
+    expect((partUnits[1].directives[0] as PartOfDirective).element,
+        same(libraryElement));
+    // CompilationUnitElement(s)
+    CompilationUnitElement firstPart;
+    CompilationUnitElement secondPart;
+    if (partUnits[0].element.uri == 'part1.dart') {
+      firstPart = partUnits[0].element;
+      secondPart = partUnits[1].element;
+    } else {
+      firstPart = partUnits[1].element;
+      secondPart = partUnits[0].element;
+    }
+    expect(firstPart.uri, 'part1.dart');
+    expect(firstPart.uriOffset, 18);
+    expect(firstPart.uriEnd, 30);
+    expect(
+        (libraryUnit.directives[1] as PartDirective).element, same(firstPart));
+
+    expect(secondPart.uri, 'part2.dart');
+    expect(secondPart.uriOffset, 37);
+    expect(secondPart.uriEnd, 49);
+    expect(
+        (libraryUnit.directives[2] as PartDirective).element, same(secondPart));
+  }
+
+  test_perform_error_missingLibraryDirectiveWithPart_hasCommon() {
+    _performBuildTask({
+      '/lib.dart': '''
+part 'partA.dart';
+part 'partB.dart';
+''',
+      '/partA.dart': '''
+part of my_lib;
+        ''',
+      '/partB.dart': '''
+part of my_lib;
+'''
+    });
+    _assertErrorsWithCodes(
+        [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    AnalysisError error = errorListener.errors[0];
+    expect(error.getProperty(ErrorProperty.PARTS_LIBRARY_NAME), 'my_lib');
+  }
+
+  test_perform_error_missingLibraryDirectiveWithPart_noCommon() {
+    _performBuildTask({
+      '/lib.dart': '''
+part 'partA.dart';
+part 'partB.dart';
+''',
+      '/partA.dart': '''
+part of libA;
+        ''',
+      '/partB.dart': '''
+part of libB;
+'''
+    });
+    _assertErrorsWithCodes(
+        [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    AnalysisError error = errorListener.errors[0];
+    expect(error.getProperty(ErrorProperty.PARTS_LIBRARY_NAME), isNull);
+  }
+
+  test_perform_error_partDoesNotExist() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part.dart';
+'''
+    });
+    // we already report URI_DOES_NOT_EXIST, no need to report other errors
+    _assertErrorsWithCodes([]);
+  }
+
+  test_perform_error_partOfDifferentLibrary() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part.dart';
+''',
+      '/part.dart': '''
+part of someOtherLib;
+'''
+    });
+    _assertErrorsWithCodes([StaticWarningCode.PART_OF_DIFFERENT_LIBRARY]);
+  }
+
+  test_perform_error_partOfNonPart() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part.dart';
+''',
+      '/part.dart': '''
+// no part of
+'''
+    });
+    _assertErrorsWithCodes([CompileTimeErrorCode.PART_OF_NON_PART]);
+  }
+
+  test_perform_invalidUri_part() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part '//////////';
+'''
+    });
+    expect(libraryElement.parts, isEmpty);
+  }
+
+  test_perform_isLaunchable_inDefiningUnit() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+main() {
+}
+'''
+    });
+    expect(outputs[IS_LAUNCHABLE], isTrue);
+    expect(libraryElement.entryPoint, isNotNull);
+  }
+
+  test_perform_isLaunchable_inPartUnit() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part.dart';
+''',
+      '/part.dart': '''
+part of lib;
+main() {
+}
+'''
+    });
+    expect(outputs[IS_LAUNCHABLE], isTrue);
+    expect(libraryElement.entryPoint, isNotNull);
+  }
+
+  test_perform_noSuchFilePart() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'no-such-file.dart';
+'''
+    });
+    expect(libraryElement.parts, hasLength(1));
+    CompilationUnitElement part = libraryElement.parts[0];
+    expect(part, isNotNull);
+    expect(part.source, isNotNull);
+    expect(part.library, same(libraryElement));
+    expect(context.exists(part.source), isFalse);
+  }
+
+  test_perform_patchTopLevelAccessors() {
+    _performBuildTask({
+      '/lib.dart': '''
+library lib;
+part 'part1.dart';
+part 'part2.dart';
+''',
+      '/part1.dart': '''
+part of lib;
+int get test => 0;
+''',
+      '/part2.dart': '''
+part of lib;
+void set test(_) {}
+'''
+    });
+    CompilationUnitElement unitElement1 = partUnits[0].element;
+    CompilationUnitElement unitElement2 = partUnits[1].element;
+    PropertyAccessorElement getter = unitElement1.accessors[0];
+    PropertyAccessorElement setter = unitElement2.accessors[0];
+    PropertyInducingElement variable = getter.variable;
+    expect(getter.isGetter, isTrue);
+    expect(setter.isSetter, isTrue);
+    expect(variable, isNotNull);
+    expect(setter.variable, same(variable));
+    expect(unitElement1.topLevelVariables, [variable]);
+    expect(unitElement2.topLevelVariables, [variable]);
+  }
+
+  void _assertErrorsWithCodes(List<ErrorCode> expectedErrorCodes) {
+    _fillErrorListener(BUILD_LIBRARY_ERRORS);
+    errorListener.assertErrorsWithCodes(expectedErrorCodes);
+  }
+
+  void _performBuildTask(Map<String, String> sourceMap) {
+    List<Source> sources = newSources(sourceMap);
+    Source libSource = sources.first;
+    computeResult(libSource, LIBRARY_ELEMENT1);
+    expect(task, new isInstanceOf<BuildLibraryElementTask>());
+    libraryUnit = context
+        .getCacheEntry(new LibrarySpecificUnit(libSource, libSource))
+        .getValue(RESOLVED_UNIT1);
+    libraryUnitElement = libraryUnit.element;
+    librarySource = libraryUnitElement.source;
+    libraryElement = outputs[LIBRARY_ELEMENT1];
+    partUnits = task.inputs[BuildLibraryElementTask.PARTS_UNIT_INPUT];
+  }
+}
+
+@reflectiveTest
+class BuildPublicNamespaceTaskTest extends _AbstractDartTaskTest {
+  test_buildInputs() {
+    Map<String, TaskInput> inputs =
+        BuildPublicNamespaceTask.buildInputs(emptySource);
+    expect(inputs, isNotNull);
+    expect(
+        inputs.keys, unorderedEquals([BuildPublicNamespaceTask.LIBRARY_INPUT]));
+  }
+
+  test_constructor() {
+    BuildPublicNamespaceTask task =
+        new BuildPublicNamespaceTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    BuildPublicNamespaceTask task =
+        BuildPublicNamespaceTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    BuildPublicNamespaceTask task =
+        new BuildPublicNamespaceTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = BuildPublicNamespaceTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform() {
+    List<Source> sources = newSources({
+      '/lib.dart': '''
+library lib;
+part 'part.dart';
+a() {}
+_b() {}
+''',
+      '/part.dart': '''
+part of lib;
+_c() {}
+d() {}
+'''
+    });
+    computeResult(sources.first, LIBRARY_ELEMENT3);
+    expect(task, new isInstanceOf<BuildPublicNamespaceTask>());
+    // validate
+    LibraryElement library = outputs[LIBRARY_ELEMENT3];
+    Namespace namespace = library.publicNamespace;
+    expect(namespace.definedNames.keys, unorderedEquals(['a', 'd']));
+  }
+}
+
+@reflectiveTest
+class BuildSourceExportClosureTaskTest extends _AbstractDartTaskTest {
+  test_perform_exportClosure() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+export 'b.dart';
+''');
+    Source sourceB = newSource(
+        '/b.dart',
+        '''
+library lib_b;
+export 'c.dart';
+''');
+    Source sourceC = newSource(
+        '/c.dart',
+        '''
+library lib_c;
+export 'a.dart';
+''');
+    Source sourceD = newSource(
+        '/d.dart',
+        '''
+library lib_d;
+''');
+    // a.dart
+    {
+      computeResult(sourceA, EXPORT_SOURCE_CLOSURE);
+      expect(task, new isInstanceOf<BuildSourceExportClosureTask>());
+      List<Source> closure = outputs[EXPORT_SOURCE_CLOSURE];
+      expect(closure, unorderedEquals([sourceA, sourceB, sourceC]));
+    }
+    // c.dart
+    {
+      computeResult(sourceC, EXPORT_SOURCE_CLOSURE);
+      expect(task, new isInstanceOf<BuildSourceExportClosureTask>());
+      List<Source> closure = outputs[EXPORT_SOURCE_CLOSURE];
+      expect(closure, unorderedEquals([sourceA, sourceB, sourceC]));
+    }
+    // d.dart
+    {
+      computeResult(sourceD, EXPORT_SOURCE_CLOSURE);
+      expect(task, new isInstanceOf<BuildSourceExportClosureTask>());
+      List<Source> closure = outputs[EXPORT_SOURCE_CLOSURE];
+      expect(closure, unorderedEquals([sourceD]));
+    }
+  }
+}
+
+@reflectiveTest
+class BuildSourceImportExportClosureTaskTest extends _AbstractDartTaskTest {
+  test_perform_importExportClosure() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+''');
+    Source sourceB = newSource(
+        '/b.dart',
+        '''
+library lib_b;
+export 'a.dart';
+''');
+    Source sourceC = newSource(
+        '/c.dart',
+        '''
+library lib_c;
+import 'b.dart';
+''');
+    Source coreSource = context.sourceFactory.resolveUri(null, 'dart:core');
+    // c.dart
+    {
+      computeResult(sourceC, IMPORT_EXPORT_SOURCE_CLOSURE);
+      expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+      List<Source> closure = outputs[IMPORT_EXPORT_SOURCE_CLOSURE];
+      expect(closure, contains(sourceA));
+      expect(closure, contains(sourceB));
+      expect(closure, contains(sourceC));
+      expect(closure, contains(coreSource));
+    }
+    // b.dart
+    {
+      computeResult(sourceB, IMPORT_EXPORT_SOURCE_CLOSURE);
+      expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+      List<Source> closure = outputs[IMPORT_EXPORT_SOURCE_CLOSURE];
+      expect(closure, contains(sourceA));
+      expect(closure, contains(sourceB));
+      expect(closure, contains(coreSource));
+    }
+  }
+
+  test_perform_isClient_false() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+import 'b.dart';
+''');
+    newSource(
+        '/b.dart',
+        '''
+library lib_b;
+''');
+    computeResult(sourceA, IS_CLIENT);
+    expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+    expect(outputs[IS_CLIENT], isFalse);
+  }
+
+  test_perform_isClient_true_export_indirect() {
+    newSource(
+        '/exports_html.dart',
+        '''
+library lib_exports_html;
+export 'dart:html';
+''');
+    Source source = newSource(
+        '/test.dart',
+        '''
+import 'exports_html.dart';
+''');
+    computeResult(source, IS_CLIENT);
+    expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+    expect(outputs[IS_CLIENT], isTrue);
+  }
+
+  test_perform_isClient_true_import_direct() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+import 'dart:html';
+''');
+    computeResult(sourceA, IS_CLIENT);
+    expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+    expect(outputs[IS_CLIENT], isTrue);
+  }
+
+  test_perform_isClient_true_import_indirect() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library lib_a;
+import 'b.dart';
+''');
+    newSource(
+        '/b.dart',
+        '''
+library lib_b;
+import 'dart:html';
+''');
+    computeResult(sourceA, IS_CLIENT);
+    expect(task, new isInstanceOf<BuildSourceImportExportClosureTask>());
+    expect(outputs[IS_CLIENT], isTrue);
+  }
+}
+
+@reflectiveTest
+class BuildTypeProviderTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    computeResult(AnalysisContextTarget.request, TYPE_PROVIDER);
+    expect(task, new isInstanceOf<BuildTypeProviderTask>());
+    // validate
+    TypeProvider typeProvider = outputs[TYPE_PROVIDER];
+    expect(typeProvider, isNotNull);
+    expect(typeProvider.boolType, isNotNull);
+    expect(typeProvider.intType, isNotNull);
+    expect(typeProvider.futureType, isNotNull);
+  }
+}
+
+@reflectiveTest
+class ComputeConstantDependenciesTaskTest extends _AbstractDartTaskTest {
+  Annotation findClassAnnotation(CompilationUnit unit, String className) {
+    for (CompilationUnitMember member in unit.declarations) {
+      if (member is ClassDeclaration && member.name.name == className) {
+        expect(member.metadata, hasLength(1));
+        return member.metadata[0];
+      }
+    }
+    fail('Annotation not found');
+    return null;
+  }
+
+  test_annotation_with_args() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+const x = 1;
+@D(x) class C {}
+class D { const D(value); }
+''');
+    // First compute the resolved unit for the source.
+    LibrarySpecificUnit librarySpecificUnit =
+        new LibrarySpecificUnit(source, source);
+    computeResult(librarySpecificUnit, RESOLVED_UNIT1);
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    // Find the elements for x and D's constructor, and the annotation on C.
+    List<PropertyAccessorElement> accessors = unit.element.accessors;
+    Element x = accessors
+        .firstWhere((PropertyAccessorElement accessor) =>
+            accessor.isGetter && accessor.name == 'x')
+        .variable;
+    List<ClassElement> types = unit.element.types;
+    Element constructorForD =
+        types.firstWhere((ClassElement cls) => cls.name == 'D').constructors[0];
+    Annotation annotation = findClassAnnotation(unit, 'C');
+    // Now compute the dependencies for the annotation, and check that it is
+    // the set [x, constructorForD].
+    // TODO(paulberry): test librarySource != source
+    computeResult(
+        new ConstantEvaluationTarget_Annotation(
+            context, source, source, annotation),
+        CONSTANT_DEPENDENCIES);
+    expect(
+        outputs[CONSTANT_DEPENDENCIES].toSet(), [x, constructorForD].toSet());
+  }
+
+  test_annotation_without_args() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+const x = 1;
+@x class C {}
+''');
+    // First compute the resolved unit for the source.
+    LibrarySpecificUnit librarySpecificUnit =
+        new LibrarySpecificUnit(source, source);
+    computeResult(librarySpecificUnit, RESOLVED_UNIT1);
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    // Find the element for x and the annotation on C.
+    List<PropertyAccessorElement> accessors = unit.element.accessors;
+    Element x = accessors
+        .firstWhere((PropertyAccessorElement accessor) =>
+            accessor.isGetter && accessor.name == 'x')
+        .variable;
+    Annotation annotation = findClassAnnotation(unit, 'C');
+    // Now compute the dependencies for the annotation, and check that it is
+    // the list [x].
+    computeResult(
+        new ConstantEvaluationTarget_Annotation(
+            context, source, source, annotation),
+        CONSTANT_DEPENDENCIES);
+    expect(outputs[CONSTANT_DEPENDENCIES], [x]);
+  }
+
+  test_enumConstant() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+enum E {A, B, C}
+''');
+    // First compute the resolved unit for the source.
+    LibrarySpecificUnit librarySpecificUnit =
+        new LibrarySpecificUnit(source, source);
+    computeResult(librarySpecificUnit, RESOLVED_UNIT2);
+    CompilationUnit unit = outputs[RESOLVED_UNIT2];
+    // Find the element for 'A'
+    EnumDeclaration enumDeclaration = unit.declarations[0];
+    EnumConstantDeclaration constantDeclaration = enumDeclaration.constants[0];
+    FieldElement constantElement = constantDeclaration.element;
+    // Now compute the dependencies for the constant and check that there are
+    // none.
+    computeResult(constantElement, CONSTANT_DEPENDENCIES);
+    expect(outputs[CONSTANT_DEPENDENCIES], isEmpty);
+  }
+
+  test_perform() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+const x = y;
+const y = 1;
+''');
+    // First compute the resolved unit for the source.
+    LibrarySpecificUnit librarySpecificUnit =
+        new LibrarySpecificUnit(source, source);
+    computeResult(librarySpecificUnit, RESOLVED_UNIT1);
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    // Find the elements for the constants x and y.
+    List<PropertyAccessorElement> accessors = unit.element.accessors;
+    Element x = accessors
+        .firstWhere((PropertyAccessorElement accessor) =>
+            accessor.isGetter && accessor.name == 'x')
+        .variable;
+    Element y = accessors
+        .firstWhere((PropertyAccessorElement accessor) =>
+            accessor.isGetter && accessor.name == 'y')
+        .variable;
+    // Now compute the dependencies for x, and check that it is the list [y].
+    computeResult(x, CONSTANT_DEPENDENCIES);
+    expect(outputs[CONSTANT_DEPENDENCIES], [y]);
+  }
+}
+
+@reflectiveTest
+class ComputeConstantValueTaskTest extends _AbstractDartTaskTest {
+  EvaluationResultImpl computeClassAnnotation(
+      Source source, CompilationUnit unit, String className) {
+    for (CompilationUnitMember member in unit.declarations) {
+      if (member is ClassDeclaration && member.name.name == className) {
+        expect(member.metadata, hasLength(1));
+        Annotation annotation = member.metadata[0];
+        ConstantEvaluationTarget_Annotation target =
+            new ConstantEvaluationTarget_Annotation(
+                context, source, source, annotation);
+        computeResult(target, CONSTANT_VALUE);
+        expect(outputs[CONSTANT_VALUE], same(target));
+        EvaluationResultImpl evaluationResult = (annotation.elementAnnotation
+            as ElementAnnotationImpl).evaluationResult;
+        return evaluationResult;
+      }
+    }
+    fail('Annotation not found');
+    return null;
+  }
+
+  test_annotation_non_const_constructor() {
+    // Calling a non-const constructor from an annotation that is illegal, but
+    // shouldn't crash analysis.
+    Source source = newSource(
+        '/test.dart',
+        '''
+class A {
+  final int i;
+  A(this.i);
+}
+
+@A(5)
+class C {}
+''');
+    // First compute the resolved unit for the source.
+    CompilationUnit unit = _resolveSource(source);
+    // Compute the constant value of the annotation on C.
+    EvaluationResultImpl evaluationResult =
+        computeClassAnnotation(source, unit, 'C');
+    // And check that it has no value stored in it.
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNull);
+  }
+
+  test_annotation_with_args() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+const x = 1;
+@D(x) class C {}
+class D {
+  const D(this.value);
+  final value;
+}
+''');
+    // First compute the resolved unit for the source.
+    CompilationUnit unit = _resolveSource(source);
+    // Compute the constant value of the annotation on C.
+    EvaluationResultImpl evaluationResult =
+        computeClassAnnotation(source, unit, 'C');
+    // And check that it has the expected value.
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNotNull);
+    expect(evaluationResult.value.type, isNotNull);
+    expect(evaluationResult.value.type.name, 'D');
+    expect(evaluationResult.value.fields, contains('value'));
+    expect(evaluationResult.value.fields['value'].intValue, 1);
+  }
+
+  test_annotation_without_args() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+const x = 1;
+@x class C {}
+''');
+    // First compute the resolved unit for the source.
+    CompilationUnit unit = _resolveSource(source);
+    // Compute the constant value of the annotation on C.
+    EvaluationResultImpl evaluationResult =
+        computeClassAnnotation(source, unit, 'C');
+    // And check that it has the expected value.
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNotNull);
+    expect(evaluationResult.value.intValue, 1);
+  }
+
+  test_circular_reference() {
+    _checkCircularities(
+        'x',
+        ['y'],
+        '''
+const x = y + 1;
+const y = x + 1;
+''');
+  }
+
+  test_circular_reference_one_element() {
+    // See dartbug.com/23490.
+    _checkCircularities('x', [], 'const x = x;');
+  }
+
+  test_circular_reference_strongly_connected_component() {
+    // When there is a circularity, all elements in the strongly connected
+    // component should be marked as having an error.
+    _checkCircularities(
+        'a',
+        ['b', 'c', 'd'],
+        '''
+const a = b;
+const b = c + d;
+const c = a;
+const d = a;
+''');
+  }
+
+  test_const_constructor_calls_implicit_super_constructor_implicitly() {
+    // Note: the situation below is a compile-time error (since the synthetic
+    // constructor for Base is non-const), but we need to handle it without
+    // throwing an exception.
+    EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
+        'x',
+        '''
+class Base {}
+class Derived extends Base {
+  const Derived();
+}
+const x = const Derived();
+''');
+    expect(evaluationResult, isNotNull);
+  }
+
+  test_dependency() {
+    EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
+        'x',
+        '''
+const x = y + 1;
+const y = 1;
+''');
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNotNull);
+    expect(evaluationResult.value.intValue, 2);
+  }
+
+  test_external_const_factory() {
+    EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
+        'x',
+        '''
+const x = const C.foo();
+
+class C extends B {
+  external const factory C.foo();
+}
+
+class B {}
+''');
+    expect(evaluationResult, isNotNull);
+  }
+
+  test_simple_constant() {
+    EvaluationResultImpl evaluationResult = _computeTopLevelVariableConstValue(
+        'x',
+        '''
+const x = 1;
+''');
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNotNull);
+    expect(evaluationResult.value.intValue, 1);
+  }
+
+  void _checkCircularities(
+      String variableName, List<String> otherVariables, String content) {
+    // Evaluating the first constant should produce an error.
+    CompilationUnit unit = _resolveUnit(content);
+    _expectCircularityError(_evaluateConstant(unit, variableName));
+    // And all the other constants involved in the strongly connected component
+    // should be set to the same error state.
+    for (String otherVariableName in otherVariables) {
+      PropertyInducingElement otherVariableElement =
+          _findVariable(unit, otherVariableName);
+      _expectCircularityError((otherVariableElement
+          as TopLevelVariableElementImpl).evaluationResult);
+    }
+  }
+
+  EvaluationResultImpl _computeTopLevelVariableConstValue(
+      String variableName, String content) {
+    return _evaluateConstant(_resolveUnit(content), variableName);
+  }
+
+  EvaluationResultImpl _evaluateConstant(
+      CompilationUnit unit, String variableName) {
+    // Find the element for the given constant.
+    PropertyInducingElement variableElement = _findVariable(unit, variableName);
+    // Now compute the value of the constant.
+    computeResult(variableElement, CONSTANT_VALUE);
+    expect(outputs[CONSTANT_VALUE], same(variableElement));
+    EvaluationResultImpl evaluationResult =
+        (variableElement as TopLevelVariableElementImpl).evaluationResult;
+    return evaluationResult;
+  }
+
+  void _expectCircularityError(EvaluationResultImpl evaluationResult) {
+    expect(evaluationResult, isNotNull);
+    expect(evaluationResult.value, isNull);
+    expect(evaluationResult.errors, hasLength(1));
+    expect(evaluationResult.errors[0].errorCode,
+        CompileTimeErrorCode.RECURSIVE_COMPILE_TIME_CONSTANT);
+  }
+
+  PropertyInducingElement _findVariable(
+      CompilationUnit unit, String variableName) {
+    // Find the element for the given constant.
+    return unit.element.topLevelVariables.firstWhere(
+        (TopLevelVariableElement variable) => variable.name == variableName);
+  }
+
+  CompilationUnit _resolveSource(Source source) {
+    LibrarySpecificUnit librarySpecificUnit =
+        new LibrarySpecificUnit(source, source);
+    computeResult(librarySpecificUnit, RESOLVED_UNIT1);
+    CompilationUnit unit = outputs[RESOLVED_UNIT1];
+    return unit;
+  }
+
+  CompilationUnit _resolveUnit(String content) =>
+      _resolveSource(newSource('/test.dart', content));
+}
+
+@reflectiveTest
+class ComputeInferableStaticVariableDependenciesTaskTest
+    extends _AbstractDartTaskTest {
+  test_perform() {
+    AnalysisTarget source = newSource(
+        '/test.dart',
+        '''
+const a = b;
+const b = 0;
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT5);
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    TopLevelVariableElement elementA = unit.element.topLevelVariables[0];
+    TopLevelVariableElement elementB = unit.element.topLevelVariables[1];
+
+    computeResult(elementA, INFERABLE_STATIC_VARIABLE_DEPENDENCIES);
+    expect(task,
+        new isInstanceOf<ComputeInferableStaticVariableDependenciesTask>());
+    expect(outputs, hasLength(1));
+    List<VariableElement> dependencies =
+        outputs[INFERABLE_STATIC_VARIABLE_DEPENDENCIES];
+    expect(dependencies, unorderedEquals([elementB]));
+  }
+}
+
+@reflectiveTest
+class ContainingLibrariesTaskTest extends _AbstractDartTaskTest {
+  test_buildInputs() {
+    Map<String, TaskInput> inputs =
+        ContainingLibrariesTask.buildInputs(emptySource);
+    expect(inputs, isNotNull);
+    expect(inputs, isEmpty);
+  }
+
+  test_constructor() {
+    ContainingLibrariesTask task =
+        new ContainingLibrariesTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    ContainingLibrariesTask task =
+        ContainingLibrariesTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    ContainingLibrariesTask task =
+        new ContainingLibrariesTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = ContainingLibrariesTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform_definingCompilationUnit() {
+    AnalysisTarget library = newSource('/test.dart', 'library test;');
+    computeResult(library, INCLUDED_PARTS);
+    computeResult(library, CONTAINING_LIBRARIES);
+    expect(task, new isInstanceOf<ContainingLibrariesTask>());
+    expect(outputs, hasLength(1));
+    List<Source> containingLibraries = outputs[CONTAINING_LIBRARIES];
+    expect(containingLibraries, unorderedEquals([library]));
+  }
+
+  test_perform_partInMultipleLibraries() {
+    AnalysisTarget library1 =
+        newSource('/lib1.dart', 'library test; part "part.dart";');
+    AnalysisTarget library2 =
+        newSource('/lib2.dart', 'library test; part "part.dart";');
+    AnalysisTarget part = newSource('/part.dart', 'part of test;');
+    computeResult(library1, INCLUDED_PARTS);
+    computeResult(library2, INCLUDED_PARTS);
+    computeResult(part, SOURCE_KIND);
+    computeResult(part, CONTAINING_LIBRARIES);
+    expect(task, new isInstanceOf<ContainingLibrariesTask>());
+    expect(outputs, hasLength(1));
+    List<Source> containingLibraries = outputs[CONTAINING_LIBRARIES];
+    expect(containingLibraries, unorderedEquals([library1, library2]));
+  }
+
+  test_perform_partInSingleLibrary() {
+    AnalysisTarget library =
+        newSource('/lib.dart', 'library test; part "part.dart";');
+    AnalysisTarget part = newSource('/part.dart', 'part of test;');
+    computeResult(library, INCLUDED_PARTS);
+    computeResult(part, SOURCE_KIND);
+    computeResult(part, CONTAINING_LIBRARIES);
+    expect(task, new isInstanceOf<ContainingLibrariesTask>());
+    expect(outputs, hasLength(1));
+    List<Source> containingLibraries = outputs[CONTAINING_LIBRARIES];
+    expect(containingLibraries, unorderedEquals([library]));
+  }
+}
+
+@reflectiveTest
+class DartErrorsTaskTest extends _AbstractDartTaskTest {
+  test_buildInputs() {
+    Map<String, TaskInput> inputs = DartErrorsTask.buildInputs(emptySource);
+    expect(inputs, isNotNull);
+    expect(
+        inputs.keys,
+        unorderedEquals([
+          DartErrorsTask.BUILD_DIRECTIVES_ERRORS_INPUT,
+          DartErrorsTask.BUILD_LIBRARY_ERRORS_INPUT,
+          DartErrorsTask.PARSE_ERRORS_INPUT,
+          DartErrorsTask.SCAN_ERRORS_INPUT,
+          DartErrorsTask.LIBRARY_UNIT_ERRORS_INPUT
+        ]));
+  }
+
+  test_constructor() {
+    DartErrorsTask task = new DartErrorsTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    DartErrorsTask task = DartErrorsTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    DartErrorsTask task = new DartErrorsTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = DartErrorsTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform_definingCompilationUnit() {
+    AnalysisTarget library =
+        newSource('/test.dart', 'library test; import "dart:math";');
+    computeResult(library, INCLUDED_PARTS);
+    computeResult(library, DART_ERRORS);
+    expect(task, new isInstanceOf<DartErrorsTask>());
+    expect(outputs, hasLength(1));
+    List<AnalysisError> errors = outputs[DART_ERRORS];
+    expect(errors, hasLength(1));
+  }
+
+  test_perform_partInSingleLibrary() {
+    AnalysisTarget library = newSource(
+        '/lib.dart', 'library test; import "dart:math"; part "part.dart";');
+    AnalysisTarget part =
+        newSource('/part.dart', 'part of test; class A extends A {}');
+    computeResult(library, INCLUDED_PARTS);
+    computeResult(library, DART_ERRORS);
+    computeResult(part, DART_ERRORS);
+    expect(task, new isInstanceOf<DartErrorsTask>());
+    expect(outputs, hasLength(1));
+    List<AnalysisError> errors = outputs[DART_ERRORS];
+    // This should contain only the errors in the part file, not the ones in the
+    // library.
+    expect(errors, hasLength(1));
+  }
+}
+
+@reflectiveTest
+class EvaluateUnitConstantsTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class C {
+  const C();
+}
+
+@x
+f() {}
+
+const x = const C();
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT);
+    expect(task, new isInstanceOf<EvaluateUnitConstantsTask>());
+    CompilationUnit unit = outputs[RESOLVED_UNIT];
+    CompilationUnitElement unitElement = unit.element;
+    expect(
+        (unitElement.types[0].constructors[0] as ConstructorElementImpl)
+            .isCycleFree,
+        isTrue);
+    expect(
+        (unitElement.functions[0].metadata[0] as ElementAnnotationImpl)
+            .evaluationResult,
+        isNotNull);
+    expect(
+        (unitElement.topLevelVariables[0] as TopLevelVariableElementImpl)
+            .evaluationResult,
+        isNotNull);
+  }
+}
+
+@reflectiveTest
+class GatherUsedImportedElementsTaskTest extends _AbstractDartTaskTest {
+  UsedImportedElements usedElements;
+  Set<String> usedElementNames;
+
+  test_perform() {
+    newSource(
+        '/a.dart',
+        r'''
+library lib_a;
+class A {}
+''');
+    newSource(
+        '/b.dart',
+        r'''
+library lib_b;
+class B {}
+''');
+    Source source = newSource(
+        '/test.dart',
+        r'''
+import 'a.dart';
+import 'b.dart';
+main() {
+  new A();
+}''');
+    _computeUsedElements(source);
+    // validate
+    expect(usedElementNames, unorderedEquals(['A']));
+  }
+
+  void _computeUsedElements(Source source) {
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, USED_IMPORTED_ELEMENTS);
+    expect(task, new isInstanceOf<GatherUsedImportedElementsTask>());
+    usedElements = outputs[USED_IMPORTED_ELEMENTS];
+    usedElementNames = usedElements.elements.map((e) => e.name).toSet();
+  }
+}
+
+@reflectiveTest
+class GatherUsedLocalElementsTaskTest extends _AbstractDartTaskTest {
+  UsedLocalElements usedElements;
+  Set<String> usedElementNames;
+
+  test_perform_localVariable() {
+    Source source = newSource(
+        '/test.dart',
+        r'''
+main() {
+  var v1 = 1;
+  var v2 = 2;
+  print(v2);
+}''');
+    _computeUsedElements(source);
+    // validate
+    expect(usedElementNames, unorderedEquals(['v2']));
+  }
+
+  test_perform_method() {
+    Source source = newSource(
+        '/test.dart',
+        r'''
+class A {
+  _m1() {}
+  _m2() {}
+}
+
+main(A a, p) {
+  a._m2();
+  p._m3();
+}
+''');
+    _computeUsedElements(source);
+    // validate
+    expect(usedElementNames, unorderedEquals(['A', 'a', 'p', '_m2']));
+    expect(usedElements.members, unorderedEquals(['_m2', '_m3']));
+  }
+
+  void _computeUsedElements(Source source) {
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, USED_LOCAL_ELEMENTS);
+    expect(task, new isInstanceOf<GatherUsedLocalElementsTask>());
+    usedElements = outputs[USED_LOCAL_ELEMENTS];
+    usedElementNames = usedElements.elements.map((e) => e.name).toSet();
+  }
+}
+
+@reflectiveTest
+class GenerateHintsTaskTest extends _AbstractDartTaskTest {
+  test_perform_bestPractices_missingReturn() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+int main() {
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.MISSING_RETURN]);
+  }
+
+  test_perform_dart2js() {
+    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
+    options.dart2jsHint = true;
+    prepareAnalysisContext(options);
+    Source source = newSource(
+        '/test.dart',
+        '''
+main(p) {
+  if (p is double) {
+    print('double');
+  }
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.IS_DOUBLE]);
+  }
+
+  test_perform_deadCode() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+  if (false) {
+    print('how?');
+  }
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.DEAD_CODE]);
+  }
+
+  test_perform_disabled() {
+    context.analysisOptions =
+        new AnalysisOptionsImpl.from(context.analysisOptions)..hint = false;
+    Source source = newSource(
+        '/test.dart',
+        '''
+int main() {
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertNoErrors();
+  }
+
+  test_perform_imports_duplicateImport() {
+    newSource(
+        '/a.dart',
+        r'''
+library lib_a;
+class A {}
+''');
+    Source source = newSource(
+        '/test.dart',
+        r'''
+import 'a.dart';
+import 'a.dart';
+main() {
+  new A();
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.DUPLICATE_IMPORT]);
+  }
+
+  test_perform_imports_unusedImport_one() {
+    newSource(
+        '/a.dart',
+        r'''
+library lib_a;
+class A {}
+''');
+    newSource(
+        '/b.dart',
+        r'''
+library lib_b;
+class B {}
+''');
+    Source source = newSource(
+        '/test.dart',
+        r'''
+import 'a.dart';
+import 'b.dart';
+main() {
+  new A();
+}''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.UNUSED_IMPORT]);
+  }
+
+  test_perform_imports_unusedImport_zero() {
+    newSource(
+        '/a.dart',
+        r'''
+library lib_a;
+class A {}
+''');
+    Source source = newSource(
+        '/test.dart',
+        r'''
+import 'a.dart';
+main() {
+  new A();
+}''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertNoErrors();
+  }
+
+  test_perform_overrideVerifier() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class A {}
+class B {
+  @override
+  m() {}
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[HintCode.OVERRIDE_ON_NON_OVERRIDING_METHOD]);
+  }
+
+  test_perform_todo() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+  // TODO(developer) foo bar
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[TodoCode.TODO]);
+  }
+
+  test_perform_unusedLocalElements_class() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class _A {}
+class _B {}
+main() {
+  new _A();
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[HintCode.UNUSED_ELEMENT]);
+  }
+
+  test_perform_unusedLocalElements_localVariable() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+  var v = 42;
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener
+        .assertErrorsWithCodes(<ErrorCode>[HintCode.UNUSED_LOCAL_VARIABLE]);
+  }
+
+  test_perform_unusedLocalElements_method() {
+    Source source = newSource(
+        '/my_lib.dart',
+        '''
+library my_lib;
+part 'my_part.dart';
+class A {
+  _ma() {}
+  _mb() {}
+  _mc() {}
+}
+''');
+    newSource(
+        '/my_part.dart',
+        '''
+part of my_lib;
+
+f(A a) {
+  a._mb();
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, HINTS);
+    expect(task, new isInstanceOf<GenerateHintsTask>());
+    // validate
+    _fillErrorListener(HINTS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[HintCode.UNUSED_ELEMENT, HintCode.UNUSED_ELEMENT]);
+  }
+}
+
+@reflectiveTest
+class InferStaticVariableTypesInUnitTaskTest extends _AbstractDartTaskTest {
+  void test_perform() {
+    enableStrongMode();
+    AnalysisTarget firstSource = newSource(
+        '/first.dart',
+        '''
+import 'second.dart';
+
+var a = new M();
+var c = b;
+''');
+    AnalysisTarget secondSource = newSource(
+        '/second.dart',
+        '''
+import 'first.dart';
+
+var b = a;
+class M {}
+''');
+    computeResult(new LibrarySpecificUnit(firstSource, firstSource),
+        RESOLVED_UNIT6); //  new isInstanceOf<InferStaticVariableTypesInUnitTask>()
+    CompilationUnit firstUnit = outputs[RESOLVED_UNIT6];
+    computeResult(
+        new LibrarySpecificUnit(secondSource, secondSource), RESOLVED_UNIT6);
+    CompilationUnit secondUnit = outputs[RESOLVED_UNIT6];
+
+    VariableDeclaration variableA = getTopLevelVariable(firstUnit, 'a');
+    VariableDeclaration variableB = getTopLevelVariable(secondUnit, 'b');
+    VariableDeclaration variableC = getTopLevelVariable(firstUnit, 'c');
+    ClassDeclaration classM = getClass(secondUnit, 'M');
+    DartType typeM = classM.element.type;
+
+    expect(variableA.element.type, typeM);
+    expect(variableB.element.type, typeM);
+    expect(variableB.initializer.staticType, typeM);
+    expect(variableC.element.type, typeM);
+    expect(variableC.initializer.staticType, typeM);
+  }
+}
+
+@reflectiveTest
+class InferStaticVariableTypeTaskTest extends _AbstractDartTaskTest {
+  void test_getDeclaration_staticField() {
+    AnalysisTarget source = newSource(
+        '/test.dart',
+        '''
+class C {
+  var field = '';
+}
+''');
+    computeResult(new LibrarySpecificUnit(source, source), RESOLVED_UNIT5);
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    VariableDeclaration declaration = getFieldInClass(unit, 'C', 'field');
+    VariableElement variable = declaration.name.staticElement;
+    InferStaticVariableTypeTask inferTask =
+        new InferStaticVariableTypeTask(task.context, variable);
+    expect(inferTask.getDeclaration(unit), declaration);
+  }
+
+  void test_getDeclaration_topLevel() {
+    AnalysisTarget source = newSource(
+        '/test.dart',
+        '''
+var topLevel = '';
+''');
+    computeResult(new LibrarySpecificUnit(source, source), RESOLVED_UNIT5);
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    VariableDeclaration declaration = getTopLevelVariable(unit, 'topLevel');
+    VariableElement variable = declaration.name.staticElement;
+    InferStaticVariableTypeTask inferTask =
+        new InferStaticVariableTypeTask(task.context, variable);
+    expect(inferTask.getDeclaration(unit), declaration);
+  }
+
+  void test_perform() {
+    AnalysisTarget source = newSource(
+        '/test.dart',
+        '''
+var topLevel = '';
+class C {
+  var field = topLevel;
+}
+''');
+    computeResult(new LibrarySpecificUnit(source, source), RESOLVED_UNIT5);
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    VariableElement topLevel =
+        getTopLevelVariable(unit, 'topLevel').name.staticElement;
+    VariableElement field =
+        getFieldInClass(unit, 'C', 'field').name.staticElement;
+
+    computeResult(field, INFERRED_STATIC_VARIABLE);
+    InterfaceType stringType = context.typeProvider.stringType;
+    expect(topLevel.type, stringType);
+    expect(field.type, stringType);
+  }
+}
+
+@reflectiveTest
+class LibraryErrorsReadyTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source library = newSource(
+        '/lib.dart',
+        r'''
+library lib;
+part 'part1.dart';
+part 'part2.dart';
+X v1;
+''');
+    Source part1 = newSource(
+        '/part1.dart',
+        r'''
+part of lib;
+X v2;
+''');
+    Source part2 = newSource(
+        '/part2.dart',
+        r'''
+part of lib;
+X v3;
+''');
+    computeResult(library, LIBRARY_ERRORS_READY);
+    expect(task, new isInstanceOf<LibraryErrorsReadyTask>());
+    expect(outputs, hasLength(1));
+    bool ready = outputs[LIBRARY_ERRORS_READY];
+    expect(ready, isTrue);
+    expect(context.getErrors(library).errors, hasLength(1));
+    expect(context.getErrors(part1).errors, hasLength(1));
+    expect(context.getErrors(part2).errors, hasLength(1));
+  }
+}
+
+@reflectiveTest
+class LibraryUnitErrorsTaskTest extends _AbstractDartTaskTest {
+  test_buildInputs() {
+    Map<String, TaskInput> inputs = LibraryUnitErrorsTask
+        .buildInputs(new LibrarySpecificUnit(emptySource, emptySource));
+    expect(inputs, isNotNull);
+    expect(
+        inputs.keys,
+        unorderedEquals([
+          LibraryUnitErrorsTask.HINTS_INPUT,
+          LibraryUnitErrorsTask.RESOLVE_REFERENCES_ERRORS_INPUT,
+          LibraryUnitErrorsTask.RESOLVE_TYPE_NAMES_ERRORS_INPUT,
+          LibraryUnitErrorsTask.VARIABLE_REFERENCE_ERRORS_INPUT,
+          LibraryUnitErrorsTask.VERIFY_ERRORS_INPUT
+        ]));
+  }
+
+  test_constructor() {
+    LibraryUnitErrorsTask task =
+        new LibraryUnitErrorsTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    LibraryUnitErrorsTask task =
+        LibraryUnitErrorsTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    LibraryUnitErrorsTask task = new LibraryUnitErrorsTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = LibraryUnitErrorsTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform_definingCompilationUnit() {
+    AnalysisTarget library =
+        newSource('/test.dart', 'library test; import "dart:math";');
+    computeResult(
+        new LibrarySpecificUnit(library, library), LIBRARY_UNIT_ERRORS);
+    expect(task, new isInstanceOf<LibraryUnitErrorsTask>());
+    expect(outputs, hasLength(1));
+    List<AnalysisError> errors = outputs[LIBRARY_UNIT_ERRORS];
+    expect(errors, hasLength(1));
+  }
+
+  test_perform_partInSingleLibrary() {
+    AnalysisTarget library =
+        newSource('/lib.dart', 'library test; part "part.dart";');
+    AnalysisTarget part = newSource('/part.dart', 'part of test;');
+    computeResult(new LibrarySpecificUnit(library, part), LIBRARY_UNIT_ERRORS);
+    expect(task, new isInstanceOf<LibraryUnitErrorsTask>());
+    expect(outputs, hasLength(1));
+    List<AnalysisError> errors = outputs[LIBRARY_UNIT_ERRORS];
+    expect(errors, hasLength(0));
+  }
+}
+
+@reflectiveTest
+class ParseDartTaskTest extends _AbstractDartTaskTest {
+  Source source;
+
+  test_buildInputs() {
+    Map<String, TaskInput> inputs = ParseDartTask.buildInputs(emptySource);
+    expect(inputs, isNotNull);
+    expect(
+        inputs.keys,
+        unorderedEquals([
+          ParseDartTask.LINE_INFO_INPUT_NAME,
+          ParseDartTask.MODIFICATION_TIME_INPUT_NAME,
+          ParseDartTask.TOKEN_STREAM_INPUT_NAME
+        ]));
+  }
+
+  test_constructor() {
+    ParseDartTask task = new ParseDartTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    ParseDartTask task = ParseDartTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    ParseDartTask task = new ParseDartTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = ParseDartTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform() {
+    _performParseTask(r'''
+part of lib;
+class B {}''');
+    expect(outputs, hasLength(8));
+    expect(outputs[EXPLICITLY_IMPORTED_LIBRARIES], hasLength(0));
+    expect(outputs[EXPORTED_LIBRARIES], hasLength(0));
+    _assertHasCore(outputs[IMPORTED_LIBRARIES], 1);
+    expect(outputs[INCLUDED_PARTS], hasLength(0));
+    expect(outputs[PARSE_ERRORS], hasLength(0));
+    expect(outputs[PARSED_UNIT], isNotNull);
+    expect(outputs[SOURCE_KIND], SourceKind.PART);
+    expect(outputs[UNITS], hasLength(1));
+  }
+
+  test_perform_computeSourceKind_noDirectives_hasContainingLibrary() {
+    // Parse "lib.dart" to let the context know that "test.dart" is included.
+    computeResult(
+        newSource(
+            '/lib.dart',
+            r'''
+library lib;
+part 'test.dart';
+'''),
+        PARSED_UNIT);
+    // If there are no the "part of" directive, then it is not a part.
+    _performParseTask('');
+    expect(outputs[SOURCE_KIND], SourceKind.LIBRARY);
+  }
+
+  test_perform_computeSourceKind_noDirectives_noContainingLibrary() {
+    _performParseTask('');
+    expect(outputs[SOURCE_KIND], SourceKind.LIBRARY);
+  }
+
+  test_perform_doesNotExist() {
+    _performParseTask(null);
+    expect(outputs, hasLength(8));
+    expect(outputs[EXPLICITLY_IMPORTED_LIBRARIES], hasLength(0));
+    expect(outputs[EXPORTED_LIBRARIES], hasLength(0));
+    _assertHasCore(outputs[IMPORTED_LIBRARIES], 1);
+    expect(outputs[INCLUDED_PARTS], hasLength(0));
+    expect(outputs[PARSE_ERRORS], hasLength(0));
+    expect(outputs[PARSED_UNIT], isNotNull);
+    expect(outputs[SOURCE_KIND], SourceKind.UNKNOWN);
+    expect(outputs[UNITS], hasLength(1));
+  }
+
+  test_perform_invalidDirectives() {
+    _performParseTask(r'''
+library lib;
+import '/does/not/exist.dart';
+import '://invaliduri.dart';
+export '${a}lib3.dart';
+part 'part.dart';
+class A {}''');
+    expect(outputs, hasLength(8));
+    expect(outputs[EXPLICITLY_IMPORTED_LIBRARIES], hasLength(1));
+    expect(outputs[EXPORTED_LIBRARIES], hasLength(0));
+    _assertHasCore(outputs[IMPORTED_LIBRARIES], 2);
+    expect(outputs[INCLUDED_PARTS], hasLength(1));
+    expect(outputs[PARSE_ERRORS], hasLength(2));
+    expect(outputs[PARSED_UNIT], isNotNull);
+    expect(outputs[SOURCE_KIND], SourceKind.LIBRARY);
+    expect(outputs[UNITS], hasLength(2));
+  }
+
+  test_perform_library() {
+    _performParseTask(r'''
+library lib;
+import 'lib2.dart';
+export 'lib3.dart';
+part 'part.dart';
+class A {''');
+    expect(outputs, hasLength(8));
+    expect(outputs[EXPLICITLY_IMPORTED_LIBRARIES], hasLength(1));
+    expect(outputs[EXPORTED_LIBRARIES], hasLength(1));
+    _assertHasCore(outputs[IMPORTED_LIBRARIES], 2);
+    expect(outputs[INCLUDED_PARTS], hasLength(1));
+    expect(outputs[PARSE_ERRORS], hasLength(1));
+    expect(outputs[PARSED_UNIT], isNotNull);
+    expect(outputs[SOURCE_KIND], SourceKind.LIBRARY);
+    expect(outputs[UNITS], hasLength(2));
+  }
+
+  test_perform_library_selfReferenceAsPart() {
+    _performParseTask(r'''
+library lib;
+part 'test.dart';
+''');
+    expect(outputs[INCLUDED_PARTS], unorderedEquals(<Source>[source]));
+  }
+
+  test_perform_part() {
+    _performParseTask(r'''
+part of lib;
+class B {}''');
+    expect(outputs, hasLength(8));
+    expect(outputs[EXPLICITLY_IMPORTED_LIBRARIES], hasLength(0));
+    expect(outputs[EXPORTED_LIBRARIES], hasLength(0));
+    _assertHasCore(outputs[IMPORTED_LIBRARIES], 1);
+    expect(outputs[INCLUDED_PARTS], hasLength(0));
+    expect(outputs[PARSE_ERRORS], hasLength(0));
+    expect(outputs[PARSED_UNIT], isNotNull);
+    expect(outputs[SOURCE_KIND], SourceKind.PART);
+    expect(outputs[UNITS], hasLength(1));
+  }
+
+  void _performParseTask(String content) {
+    source = newSource('/test.dart', content);
+    computeResult(source, PARSED_UNIT);
+    expect(task, new isInstanceOf<ParseDartTask>());
+  }
+
+  static void _assertHasCore(List<Source> sources, int lenght) {
+    expect(sources, hasLength(lenght));
+    expect(sources, contains(predicate((Source s) {
+      return s.fullName.endsWith('core.dart');
+    })));
+  }
+}
+
+@reflectiveTest
+class PartiallyResolveReferencesTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    enableStrongMode();
+    Source source = newSource(
+        '/test.dart',
+        '''
+int a = b;
+int b = c;
+var d = 0;
+class A {}
+class C {
+  static final f = '';
+  var g = 0;
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT5);
+    expect(task, new isInstanceOf<PartiallyResolveUnitReferencesTask>());
+    // Test the outputs
+    expect(outputs[CLASSES_IN_UNIT], hasLength(2));
+    expect(outputs[INFERABLE_STATIC_VARIABLES_IN_UNIT], hasLength(2));
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    expect(unit, same(outputs[RESOLVED_UNIT5]));
+    // Test the state of the AST
+    TopLevelVariableDeclaration a = unit.declarations[0];
+    VariableDeclaration variableA = a.variables.variables[0];
+    SimpleIdentifier initializer = variableA.initializer;
+    expect(initializer.staticElement, isNotNull);
+    // Test the error generation
+    _fillErrorListener(PARTIALLY_RESOLVE_REFERENCES_ERRORS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[StaticWarningCode.UNDEFINED_IDENTIFIER]);
+  }
+
+  test_perform_importExport() {
+    newSource(
+        '/a.dart',
+        '''
+library a;
+class A<T> {
+  T m() {}
+}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library b;
+export 'a.dart';
+''');
+    Source sourceC = newSource(
+        '/c.dart',
+        '''
+library c;
+import 'b.dart';
+main() {
+  new A<int>().m();
+}
+''');
+    computeResult(new LibrarySpecificUnit(sourceC, sourceC), RESOLVED_UNIT5);
+    expect(task, new isInstanceOf<PartiallyResolveUnitReferencesTask>());
+    // validate
+    expect(outputs[CLASSES_IN_UNIT], hasLength(0));
+    expect(outputs[INFERABLE_STATIC_VARIABLES_IN_UNIT], hasLength(0));
+    CompilationUnit unit = outputs[RESOLVED_UNIT5];
+    expect(unit, isNotNull);
+
+    FunctionDeclaration functionDeclaration = unit.declarations[0];
+    BlockFunctionBody body = functionDeclaration.functionExpression.body;
+    List<Statement> statements = body.block.statements;
+    ExpressionStatement statement = statements[0];
+    MethodInvocation invocation = statement.expression;
+    MethodElement methodElement = invocation.methodName.staticElement;
+    expect(methodElement, isNotNull);
+    expect(methodElement.type, isNotNull);
+    expect(methodElement.returnType.toString(), 'int');
+  }
+}
+
+@reflectiveTest
+class ResolveLibraryTypeNamesTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source sourceLib = newSource(
+        '/my_lib.dart',
+        '''
+library my_lib;
+part 'my_part.dart';
+class A {}
+class B extends A {}
+''');
+    newSource(
+        '/my_part.dart',
+        '''
+part of my_lib;
+class C extends A {}
+''');
+    computeResult(sourceLib, LIBRARY_ELEMENT5);
+    expect(task, new isInstanceOf<ResolveLibraryTypeNamesTask>());
+    // validate
+    LibraryElement library = outputs[LIBRARY_ELEMENT5];
+    {
+      ClassElement classB = library.getType('B');
+      expect(classB.supertype.displayName, 'A');
+    }
+    {
+      ClassElement classC = library.getType('C');
+      expect(classC.supertype.displayName, 'A');
+    }
+  }
+
+  test_perform_external() {
+    Source sourceA = newSource(
+        '/a.dart',
+        '''
+library a;
+import 'b.dart';
+class A extends B {}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library b;
+class B {}
+''');
+    // The reference A to B should be resolved, but there's no requirement that
+    // the full class hierarchy be resolved.
+    computeResult(sourceA, LIBRARY_ELEMENT5);
+    expect(task, new isInstanceOf<ResolveLibraryTypeNamesTask>());
+    // validate
+    LibraryElement library = outputs[LIBRARY_ELEMENT5];
+    {
+      ClassElement clazz = library.getType('A');
+      expect(clazz.displayName, 'A');
+      clazz = clazz.supertype.element;
+      expect(clazz.displayName, 'B');
+    }
+  }
+}
+
+@reflectiveTest
+class ResolveReferencesTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class A {
+  m() {}
+}
+main(A a) {
+  a.m();
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    // prepare unit and "a.m()" invocation
+    computeResult(target, RESOLVED_UNIT8);
+    CompilationUnit unit = outputs[RESOLVED_UNIT8];
+    // walk the AST
+    FunctionDeclaration function = unit.declarations[1];
+    BlockFunctionBody body = function.functionExpression.body;
+    ExpressionStatement statement = body.block.statements[0];
+    MethodInvocation invocation = statement.expression;
+    expect(task, new isInstanceOf<ResolveUnitReferencesTask>());
+    expect(unit, same(outputs[RESOLVED_UNIT8]));
+    // a.m() is resolved now
+    expect(invocation.methodName.staticElement, isNotNull);
+  }
+
+  test_perform_errors() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class A {
+}
+main(A a) {
+  a.unknownMethod();
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT8);
+    expect(task, new isInstanceOf<ResolveUnitReferencesTask>());
+    // validate
+    _fillErrorListener(RESOLVE_REFERENCES_ERRORS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[StaticTypeWarningCode.UNDEFINED_METHOD]);
+  }
+
+  test_perform_importExport() {
+    newSource(
+        '/a.dart',
+        '''
+library a;
+class A<T> {
+  T m() {}
+}
+''');
+    newSource(
+        '/b.dart',
+        '''
+library b;
+export 'a.dart';
+''');
+    Source sourceC = newSource(
+        '/c.dart',
+        '''
+library c;
+import 'b.dart';
+main() {
+  new A<int>().m();
+}
+''');
+    computeResult(new LibrarySpecificUnit(sourceC, sourceC), RESOLVED_UNIT8);
+    expect(task, new isInstanceOf<ResolveUnitReferencesTask>());
+    // validate
+    CompilationUnit unit = outputs[RESOLVED_UNIT8];
+    expect(unit, isNotNull);
+    {
+      FunctionDeclaration functionDeclaration = unit.declarations[0];
+      BlockFunctionBody body = functionDeclaration.functionExpression.body;
+      List<Statement> statements = body.block.statements;
+      ExpressionStatement statement = statements[0];
+      MethodInvocation invocation = statement.expression;
+      MethodElement methodElement = invocation.methodName.staticElement;
+      expect(methodElement, isNotNull);
+      expect(methodElement.type, isNotNull);
+      expect(methodElement.returnType.toString(), 'int');
+    }
+  }
+}
+
+@reflectiveTest
+class ResolveUnitTypeNamesTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+class A {}
+class B extends A {}
+int f(String p) => p.length;
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT3);
+    expect(task, new isInstanceOf<ResolveUnitTypeNamesTask>());
+    // validate
+    CompilationUnit unit = outputs[RESOLVED_UNIT3];
+    {
+      ClassDeclaration nodeA = unit.declarations[0];
+      ClassDeclaration nodeB = unit.declarations[1];
+      DartType extendsType = nodeB.extendsClause.superclass.type;
+      expect(extendsType, nodeA.element.type);
+    }
+    {
+      FunctionDeclaration functionNode = unit.declarations[2];
+      DartType returnType = functionNode.returnType.type;
+      List<FormalParameter> parameters =
+          functionNode.functionExpression.parameters.parameters;
+      expect(returnType.displayName, 'int');
+      expect(parameters[0].element.type.displayName, 'String');
+    }
+  }
+
+  test_perform_errors() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+NoSuchClass f() => null;
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVE_TYPE_NAMES_ERRORS);
+    expect(task, new isInstanceOf<ResolveUnitTypeNamesTask>());
+    // validate
+    _fillErrorListener(RESOLVE_TYPE_NAMES_ERRORS);
+    errorListener
+        .assertErrorsWithCodes(<ErrorCode>[StaticWarningCode.UNDEFINED_CLASS]);
+  }
+
+  test_perform_typedef() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+typedef int F(G g);
+typedef String G(int p);
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT3);
+    expect(task, new isInstanceOf<ResolveUnitTypeNamesTask>());
+    // validate
+    CompilationUnit unit = outputs[RESOLVED_UNIT3];
+    FunctionTypeAlias nodeF = unit.declarations[0];
+    FunctionTypeAlias nodeG = unit.declarations[1];
+    {
+      FormalParameter parameter = nodeF.parameters.parameters[0];
+      DartType parameterType = parameter.element.type;
+      Element returnTypeElement = nodeF.returnType.type.element;
+      expect(returnTypeElement.displayName, 'int');
+      expect(parameterType.element, nodeG.element);
+    }
+    {
+      FormalParameter parameter = nodeG.parameters.parameters[0];
+      DartType parameterType = parameter.element.type;
+      expect(nodeG.returnType.type.element.displayName, 'String');
+      expect(parameterType.element.displayName, 'int');
+    }
+  }
+
+  test_perform_typedef_errors() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+typedef int F(NoSuchType p);
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVE_TYPE_NAMES_ERRORS);
+    expect(task, new isInstanceOf<ResolveUnitTypeNamesTask>());
+    // validate
+    _fillErrorListener(RESOLVE_TYPE_NAMES_ERRORS);
+    errorListener
+        .assertErrorsWithCodes(<ErrorCode>[StaticWarningCode.UNDEFINED_CLASS]);
+  }
+}
+
+@reflectiveTest
+class ResolveVariableReferencesTaskTest extends _AbstractDartTaskTest {
+  /**
+   * Verify that the mutated states of the given [variable] correspond to the
+   * [mutatedInClosure] and [mutatedInScope] matchers.
+   */
+  void expectMutated(VariableElement variable, Matcher mutatedInClosure,
+      Matcher mutatedInScope) {
+    expect(variable.isPotentiallyMutatedInClosure, mutatedInClosure);
+    expect(variable.isPotentiallyMutatedInScope, mutatedInScope);
+  }
+
+  test_perform_buildClosureLibraryElements() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT4);
+    expect(task, new isInstanceOf<ResolveVariableReferencesTask>());
+  }
+
+  test_perform_local() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+  var v1 = 1;
+  var v2 = 1;
+  var v3 = 1;
+  var v4 = 1;
+  v2 = 2;
+  v4 = 2;
+  localFunction() {
+    v3 = 3;
+    v4 = 3;
+  }
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT4);
+    expect(task, new isInstanceOf<ResolveVariableReferencesTask>());
+    // validate
+    CompilationUnit unit = outputs[RESOLVED_UNIT4];
+    FunctionElement main = unit.element.functions[0];
+    expectMutated(main.localVariables[0], isFalse, isFalse);
+    expectMutated(main.localVariables[1], isFalse, isTrue);
+    expectMutated(main.localVariables[2], isTrue, isTrue);
+    expectMutated(main.localVariables[3], isTrue, isTrue);
+  }
+
+  test_perform_parameter() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main(p1, p2, p3, p4) {
+  p2 = 2;
+  p4 = 2;
+  localFunction() {
+    p3 = 3;
+    p4 = 3;
+  }
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, RESOLVED_UNIT4);
+    expect(task, new isInstanceOf<ResolveVariableReferencesTask>());
+    // validate
+    CompilationUnit unit = outputs[RESOLVED_UNIT4];
+    FunctionElement main = unit.element.functions[0];
+    expectMutated(main.parameters[0], isFalse, isFalse);
+    expectMutated(main.parameters[1], isFalse, isTrue);
+    expectMutated(main.parameters[2], isTrue, isTrue);
+    expectMutated(main.parameters[3], isTrue, isTrue);
+  }
+}
+
+@reflectiveTest
+class ScanDartTaskTest extends _AbstractDartTaskTest {
+  test_buildInputs() {
+    Map<String, TaskInput> inputs = ScanDartTask.buildInputs(emptySource);
+    expect(inputs, isNotNull);
+    expect(inputs.keys, unorderedEquals([ScanDartTask.CONTENT_INPUT_NAME]));
+  }
+
+  test_constructor() {
+    ScanDartTask task = new ScanDartTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_createTask() {
+    ScanDartTask task = ScanDartTask.createTask(context, emptySource);
+    expect(task, isNotNull);
+    expect(task.context, context);
+    expect(task.target, emptySource);
+  }
+
+  test_description() {
+    ScanDartTask task = new ScanDartTask(null, emptySource);
+    expect(task.description, isNotNull);
+  }
+
+  test_descriptor() {
+    TaskDescriptor descriptor = ScanDartTask.DESCRIPTOR;
+    expect(descriptor, isNotNull);
+  }
+
+  test_perform_errors() {
+    _performScanTask('import "');
+    expect(outputs, hasLength(3));
+    expect(outputs[LINE_INFO], isNotNull);
+    expect(outputs[SCAN_ERRORS], hasLength(1));
+    expect(outputs[TOKEN_STREAM], isNotNull);
+  }
+
+  test_perform_noErrors() {
+    _performScanTask('class A {}');
+    expect(outputs, hasLength(3));
+    expect(outputs[LINE_INFO], isNotNull);
+    expect(outputs[SCAN_ERRORS], hasLength(0));
+    expect(outputs[TOKEN_STREAM], isNotNull);
+  }
+
+  test_perform_script() {
+    String scriptContent = '''
+      void buttonPressed() {
+    ''';
+    String htmlContent = '''
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>test page</title>
+    <script type='application/dart'>$scriptContent</script>
+  </head>
+  <body>Test</body>
+</html>
+''';
+    Source source = newSource('/test.html', htmlContent);
+    DartScript script =
+        new DartScript(source, [new ScriptFragment(97, 5, 36, scriptContent)]);
+
+    computeResult(script, TOKEN_STREAM);
+    expect(task, new isInstanceOf<ScanDartTask>());
+    expect(outputs[LINE_INFO], isNotNull);
+    expect(outputs[SCAN_ERRORS], isEmpty);
+    Token tokenStream = outputs[TOKEN_STREAM];
+    expect(tokenStream, isNotNull);
+    expect(tokenStream.lexeme, 'void');
+  }
+
+  void _performScanTask(String content) {
+    AnalysisTarget target = newSource('/test.dart', content);
+    computeResult(target, TOKEN_STREAM);
+    expect(task, new isInstanceOf<ScanDartTask>());
+  }
+}
+
+@reflectiveTest
+class VerifyUnitTaskTest extends _AbstractDartTaskTest {
+  test_perform_constantError() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main(int p) {
+  const v = p;
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, VERIFY_ERRORS);
+    expect(task, new isInstanceOf<VerifyUnitTask>());
+    // validate
+    _fillErrorListener(VERIFY_ERRORS);
+    errorListener.assertErrorsWithCodes(<ErrorCode>[
+      CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
+    ]);
+  }
+
+  test_perform_directiveError() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+import 'no-such-file.dart';
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, VERIFY_ERRORS);
+    expect(task, new isInstanceOf<VerifyUnitTask>());
+    // validate
+    _fillErrorListener(VERIFY_ERRORS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
+  }
+
+  test_perform_verifyError() {
+    Source source = newSource(
+        '/test.dart',
+        '''
+main() {
+  if (42) {
+    print('Not bool!');
+  }
+}
+''');
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    computeResult(target, VERIFY_ERRORS);
+    expect(task, new isInstanceOf<VerifyUnitTask>());
+    // validate
+    _fillErrorListener(VERIFY_ERRORS);
+    errorListener.assertErrorsWithCodes(
+        <ErrorCode>[StaticTypeWarningCode.NON_BOOL_CONDITION]);
+  }
+}
+
+class _AbstractDartTaskTest extends AbstractContextTest {
+  Source emptySource;
+
+  GatheringErrorListener errorListener = new GatheringErrorListener();
+
+  void assertIsInvalid(AnalysisTarget target, ResultDescriptor descriptor) {
+    CacheEntry entry = context.getCacheEntry(target);
+    expect(entry.isInvalid(descriptor), isTrue);
+  }
+
+  void assertIsValid(AnalysisTarget target, ResultDescriptor descriptor) {
+    CacheEntry entry = context.getCacheEntry(target);
+    expect(entry.isValid(descriptor), isTrue);
+  }
+
+  void assertSameResults(List<ResultDescriptor> descriptors) {
+    descriptors.forEach((descriptor) {
+      var oldResult = oldOutputs[descriptor];
+      var newResult = outputs[descriptor];
+      expect(newResult, same(oldResult), reason: descriptor.name);
+    });
+  }
+
+  /**
+   * Create a script object with a single fragment containing the given
+   * [scriptContent].
+   */
+  DartScript createScript(String scriptContent) {
+    String htmlContent = '''
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>test page</title>
+    <script type='application/dart'>$scriptContent</script>
+  </head>
+  <body>Test</body>
+</html>
+''';
+    Source source = newSource('/test.html', htmlContent);
+    return new DartScript(
+        source, [new ScriptFragment(97, 5, 36, scriptContent)]);
+  }
+
+  /**
+   * Enable strong mode in the current analysis context.
+   */
+  void enableStrongMode() {
+    AnalysisOptionsImpl options = context.analysisOptions;
+    options.strongMode = true;
+    context.analysisOptions = options;
+  }
+
+  /**
+   * Return the declaration of the class with the given [className] in the given
+   * compilation [unit].
+   */
+  ClassDeclaration getClass(CompilationUnit unit, String className) {
+    NodeList<CompilationUnitMember> unitMembers = unit.declarations;
+    for (CompilationUnitMember unitMember in unitMembers) {
+      if (unitMember is ClassDeclaration && unitMember.name.name == className) {
+        return unitMember;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Return the declaration of the field with the given [fieldName] in the class
+   * with the given [className] in the given compilation [unit].
+   */
+  VariableDeclaration getFieldInClass(
+      CompilationUnit unit, String className, String fieldName) {
+    ClassDeclaration unitMember = getClass(unit, className);
+    if (unitMember == null) {
+      return null;
+    }
+    NodeList<ClassMember> classMembers = unitMember.members;
+    for (ClassMember classMember in classMembers) {
+      if (classMember is FieldDeclaration) {
+        NodeList<VariableDeclaration> fields = classMember.fields.variables;
+        for (VariableDeclaration field in fields) {
+          if (field.name.name == fieldName) {
+            return field;
+          }
+        }
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Return the declaration of the top-level variable with the given
+   * [variableName] in the given compilation [unit].
+   */
+  VariableDeclaration getTopLevelVariable(
+      CompilationUnit unit, String variableName) {
+    NodeList<CompilationUnitMember> unitMembers = unit.declarations;
+    for (CompilationUnitMember unitMember in unitMembers) {
+      if (unitMember is TopLevelVariableDeclaration) {
+        NodeList<VariableDeclaration> variables =
+            unitMember.variables.variables;
+        for (VariableDeclaration variable in variables) {
+          if (variable.name.name == variableName) {
+            return variable;
+          }
+        }
+      }
+    }
+    return null;
+  }
+
+  void setUp() {
+    super.setUp();
+    emptySource = newSource('/test.dart');
+  }
+
+  /**
+   * Fill [errorListener] with [result] errors in the current [task].
+   */
+  void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
+    List<AnalysisError> errors = task.outputs[result];
+    expect(errors, isNotNull, reason: result.name);
+    errorListener = new GatheringErrorListener();
+    errorListener.addAll(errors);
+  }
+}