Split resolver_test.dart into smaller files.

pkg/analyzer/test/generated/resolver_test_case.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library analyzer.test.generated.resolver_test_case;
+
+import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/visitor.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/type.dart';
+import 'package:analyzer/src/dart/element/element.dart';
+import 'package:analyzer/src/dart/element/type.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/java_core.dart';
+import 'package:analyzer/src/generated/java_engine.dart';
+import 'package:analyzer/src/generated/java_engine_io.dart';
+import 'package:analyzer/src/generated/resolver.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+import 'package:analyzer/src/generated/testing/ast_factory.dart';
+import 'package:analyzer/src/generated/testing/element_factory.dart';
+import 'package:unittest/unittest.dart';
+
+import 'analysis_context_factory.dart';
+import 'test_support.dart';
+
+class ResolverTestCase extends EngineTestCase {
+  /**
+   * The analysis context used to parse the compilation units being resolved.
+   */
+  InternalAnalysisContext analysisContext2;
+
+  /**
+   * Specifies if [assertErrors] should check for [HintCode.UNUSED_ELEMENT] and
+   * [HintCode.UNUSED_FIELD].
+   */
+  bool enableUnusedElement = false;
+
+  /**
+   * Specifies if [assertErrors] should check for [HintCode.UNUSED_LOCAL_VARIABLE].
+   */
+  bool enableUnusedLocalVariable = false;
+
+  AnalysisContext get analysisContext => analysisContext2;
+
+  /**
+   * Return a type provider that can be used to test the results of resolution.
+   *
+   * @return a type provider
+   * @throws AnalysisException if dart:core cannot be resolved
+   */
+  TypeProvider get typeProvider => analysisContext2.typeProvider;
+
+  /**
+   * Return a type system that can be used to test the results of resolution.
+   *
+   * @return a type system
+   */
+  TypeSystem get typeSystem => analysisContext2.typeSystem;
+
+  /**
+   * Add a source file to the content provider. The file path should be absolute.
+   *
+   * @param filePath the path of the file being added
+   * @param contents the contents to be returned by the content provider for the specified file
+   * @return the source object representing the added file
+   */
+  Source addNamedSource(String filePath, String contents) {
+    Source source = cacheSource(filePath, contents);
+    ChangeSet changeSet = new ChangeSet();
+    changeSet.addedSource(source);
+    analysisContext2.applyChanges(changeSet);
+    return source;
+  }
+
+  /**
+   * Add a source file to the content provider.
+   *
+   * @param contents the contents to be returned by the content provider for the specified file
+   * @return the source object representing the added file
+   */
+  Source addSource(String contents) => addNamedSource("/test.dart", contents);
+
+  /**
+   * Assert that the number of errors reported against the given source matches the number of errors
+   * that are given and that they have the expected error codes. The order in which the errors were
+   * gathered is ignored.
+   *
+   * @param source the source against which the errors should have been reported
+   * @param expectedErrorCodes the error codes of the errors that should have been reported
+   * @throws AnalysisException if the reported errors could not be computed
+   * @throws AssertionFailedError if a different number of errors have been reported than were
+   *           expected
+   */
+  void assertErrors(Source source,
+      [List<ErrorCode> expectedErrorCodes = ErrorCode.EMPTY_LIST]) {
+    GatheringErrorListener errorListener = new GatheringErrorListener();
+    for (AnalysisError error in analysisContext2.computeErrors(source)) {
+      expect(error.source, source);
+      ErrorCode errorCode = error.errorCode;
+      if (!enableUnusedElement &&
+          (errorCode == HintCode.UNUSED_ELEMENT ||
+              errorCode == HintCode.UNUSED_FIELD)) {
+        continue;
+      }
+      if (!enableUnusedLocalVariable &&
+          (errorCode == HintCode.UNUSED_CATCH_CLAUSE ||
+              errorCode == HintCode.UNUSED_CATCH_STACK ||
+              errorCode == HintCode.UNUSED_LOCAL_VARIABLE)) {
+        continue;
+      }
+      errorListener.onError(error);
+    }
+    errorListener.assertErrorsWithCodes(expectedErrorCodes);
+  }
+
+  /**
+   * Asserts that [code] verifies, but has errors with the given error codes.
+   *
+   * Like [assertErrors], but takes a string of source code.
+   */
+  // TODO(rnystrom): Use this in more tests that have the same structure.
+  void assertErrorsInCode(String code, List<ErrorCode> errors) {
+    Source source = addSource(code);
+    computeLibrarySourceErrors(source);
+    assertErrors(source, errors);
+    verify([source]);
+  }
+
+  /**
+   * Asserts that [code] has errors with the given error codes.
+   *
+   * Like [assertErrors], but takes a string of source code.
+   */
+  void assertErrorsInUnverifiedCode(String code, List<ErrorCode> errors) {
+    Source source = addSource(code);
+    computeLibrarySourceErrors(source);
+    assertErrors(source, errors);
+  }
+
+  /**
+   * Assert that no errors have been reported against the given source.
+   *
+   * @param source the source against which no errors should have been reported
+   * @throws AnalysisException if the reported errors could not be computed
+   * @throws AssertionFailedError if any errors have been reported
+   */
+  void assertNoErrors(Source source) {
+    assertErrors(source);
+  }
+
+  /**
+   * Asserts that [code] has no errors or warnings.
+   */
+  // TODO(rnystrom): Use this in more tests that have the same structure.
+  void assertNoErrorsInCode(String code) {
+    Source source = addSource(code);
+    computeLibrarySourceErrors(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
+  /**
+   * Cache the source file content in the source factory but don't add the source to the analysis
+   * context. The file path should be absolute.
+   *
+   * @param filePath the path of the file being cached
+   * @param contents the contents to be returned by the content provider for the specified file
+   * @return the source object representing the cached file
+   */
+  Source cacheSource(String filePath, String contents) {
+    Source source = new FileBasedSource(FileUtilities2.createFile(filePath));
+    analysisContext2.setContents(source, contents);
+    return source;
+  }
+
+  /**
+   * Change the contents of the given [source] to the given [contents].
+   */
+  void changeSource(Source source, String contents) {
+    analysisContext2.setContents(source, contents);
+    ChangeSet changeSet = new ChangeSet();
+    changeSet.changedSource(source);
+    analysisContext2.applyChanges(changeSet);
+  }
+
+  /**
+   * Computes errors for the given [librarySource].
+   * This assumes that the given [librarySource] and its parts have already
+   * been added to the content provider using the method [addNamedSource].
+   */
+  void computeLibrarySourceErrors(Source librarySource) {
+    analysisContext.computeErrors(librarySource);
+  }
+
+  /**
+   * Create a library element that represents a library named `"test"` containing a single
+   * empty compilation unit.
+   *
+   * @return the library element that was created
+   */
+  LibraryElementImpl createDefaultTestLibrary() =>
+      createTestLibrary(AnalysisContextFactory.contextWithCore(), "test");
+
+  /**
+   * Create a library element that represents a library with the given name containing a single
+   * empty compilation unit.
+   *
+   * @param libraryName the name of the library to be created
+   * @return the library element that was created
+   */
+  LibraryElementImpl createTestLibrary(
+      AnalysisContext context, String libraryName,
+      [List<String> typeNames]) {
+    String fileName = "$libraryName.dart";
+    FileBasedSource definingCompilationUnitSource =
+    createNamedSource(fileName);
+    List<CompilationUnitElement> sourcedCompilationUnits;
+    if (typeNames == null) {
+      sourcedCompilationUnits = CompilationUnitElement.EMPTY_LIST;
+    } else {
+      int count = typeNames.length;
+      sourcedCompilationUnits = new List<CompilationUnitElement>(count);
+      for (int i = 0; i < count; i++) {
+        String typeName = typeNames[i];
+        ClassElementImpl type =
+        new ClassElementImpl.forNode(AstFactory.identifier3(typeName));
+        String fileName = "$typeName.dart";
+        CompilationUnitElementImpl compilationUnit =
+        new CompilationUnitElementImpl(fileName);
+        compilationUnit.source = createNamedSource(fileName);
+        compilationUnit.librarySource = definingCompilationUnitSource;
+        compilationUnit.types = <ClassElement>[type];
+        sourcedCompilationUnits[i] = compilationUnit;
+      }
+    }
+    CompilationUnitElementImpl compilationUnit =
+    new CompilationUnitElementImpl(fileName);
+    compilationUnit.librarySource =
+        compilationUnit.source = definingCompilationUnitSource;
+    LibraryElementImpl library = new LibraryElementImpl.forNode(
+        context, AstFactory.libraryIdentifier2([libraryName]));
+    library.definingCompilationUnit = compilationUnit;
+    library.parts = sourcedCompilationUnits;
+    return library;
+  }
+
+  Expression findTopLevelConstantExpression(
+      CompilationUnit compilationUnit, String name) =>
+      findTopLevelDeclaration(compilationUnit, name).initializer;
+
+  VariableDeclaration findTopLevelDeclaration(
+      CompilationUnit compilationUnit, String name) {
+    for (CompilationUnitMember member in compilationUnit.declarations) {
+      if (member is TopLevelVariableDeclaration) {
+        for (VariableDeclaration variable in member.variables.variables) {
+          if (variable.name.name == name) {
+            return variable;
+          }
+        }
+      }
+    }
+    return null;
+    // Not found
+  }
+
+  /**
+   * In the rare cases we want to group several tests into single "test_" method, so need a way to
+   * reset test instance to reuse it.
+   */
+  void reset() {
+    analysisContext2 = AnalysisContextFactory.contextWithCore();
+  }
+
+  /**
+   * Reset the analysis context to have the given options applied.
+   *
+   * @param options the analysis options to be applied to the context
+   */
+  void resetWithOptions(AnalysisOptions options) {
+    analysisContext2 =
+        AnalysisContextFactory.contextWithCoreAndOptions(options);
+  }
+
+  /**
+   * Given a library and all of its parts, resolve the contents of the library and the contents of
+   * the parts. This assumes that the sources for the library and its parts have already been added
+   * to the content provider using the method [addNamedSource].
+   *
+   * @param librarySource the source for the compilation unit that defines the library
+   * @return the element representing the resolved library
+   * @throws AnalysisException if the analysis could not be performed
+   */
+  LibraryElement resolve2(Source librarySource) =>
+      analysisContext2.computeLibraryElement(librarySource);
+
+  /**
+   * Return the resolved compilation unit corresponding to the given source in the given library.
+   *
+   * @param source the source of the compilation unit to be returned
+   * @param library the library in which the compilation unit is to be resolved
+   * @return the resolved compilation unit
+   * @throws Exception if the compilation unit could not be resolved
+   */
+  CompilationUnit resolveCompilationUnit(
+      Source source, LibraryElement library) =>
+      analysisContext2.resolveCompilationUnit(source, library);
+
+  CompilationUnit resolveSource(String sourceText) =>
+      resolveSource2("/test.dart", sourceText);
+
+  CompilationUnit resolveSource2(String fileName, String sourceText) {
+    Source source = addNamedSource(fileName, sourceText);
+    LibraryElement library = analysisContext.computeLibraryElement(source);
+    return analysisContext.resolveCompilationUnit(source, library);
+  }
+
+  Source resolveSources(List<String> sourceTexts) {
+    for (int i = 0; i < sourceTexts.length; i++) {
+      CompilationUnit unit =
+      resolveSource2("/lib${i + 1}.dart", sourceTexts[i]);
+      // reference the source if this is the last source
+      if (i + 1 == sourceTexts.length) {
+        return unit.element.source;
+      }
+    }
+    return null;
+  }
+
+  void resolveWithAndWithoutExperimental(
+      List<String> strSources,
+      List<ErrorCode> codesWithoutExperimental,
+      List<ErrorCode> codesWithExperimental) {
+    // Setup analysis context as non-experimental
+    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
+//    options.enableDeferredLoading = false;
+    resetWithOptions(options);
+    // Analysis and assertions
+    Source source = resolveSources(strSources);
+    assertErrors(source, codesWithoutExperimental);
+    verify([source]);
+    // Setup analysis context as experimental
+    reset();
+    // Analysis and assertions
+    source = resolveSources(strSources);
+    assertErrors(source, codesWithExperimental);
+    verify([source]);
+  }
+
+  void resolveWithErrors(List<String> strSources, List<ErrorCode> codes) {
+    // Analysis and assertions
+    Source source = resolveSources(strSources);
+    assertErrors(source, codes);
+    verify([source]);
+  }
+
+  @override
+  void setUp() {
+    ElementFactory.flushStaticState();
+    super.setUp();
+    reset();
+  }
+
+  @override
+  void tearDown() {
+    analysisContext2 = null;
+    super.tearDown();
+  }
+
+  /**
+   * Verify that all of the identifiers in the compilation units associated with
+   * the given [sources] have been resolved.
+   */
+  void verify(List<Source> sources) {
+    ResolutionVerifier verifier = new ResolutionVerifier();
+    for (Source source in sources) {
+      List<Source> libraries = analysisContext2.getLibrariesContaining(source);
+      for (Source library in libraries) {
+        analysisContext2
+            .resolveCompilationUnit2(source, library)
+            .accept(verifier);
+      }
+    }
+    verifier.assertResolved();
+  }
+
+  /**
+   * @param code the code that assigns the value to the variable "v", no matter how. We check that
+   *          "v" has expected static and propagated type.
+   */
+  void assertPropagatedAssignedType(String code, DartType expectedStaticType,
+      DartType expectedPropagatedType) {
+    SimpleIdentifier identifier = findMarkedIdentifier(code, "v = ");
+    expect(identifier.staticType, same(expectedStaticType));
+    expect(identifier.propagatedType, same(expectedPropagatedType));
+  }
+
+  /**
+   * @param code the code that iterates using variable "v". We check that
+   *          "v" has expected static and propagated type.
+   */
+  void assertPropagatedIterationType(String code, DartType expectedStaticType,
+      DartType expectedPropagatedType) {
+    SimpleIdentifier identifier = findMarkedIdentifier(code, "v in ");
+    expect(identifier.staticType, same(expectedStaticType));
+    expect(identifier.propagatedType, same(expectedPropagatedType));
+  }
+
+  /**
+   * Check the static and propagated types of the expression marked with "; // marker" comment.
+   *
+   * @param code source code to analyze, with the expression to check marked with "// marker".
+   * @param expectedStaticType if non-null, check actual static type is equal to this.
+   * @param expectedPropagatedType if non-null, check actual static type is equal to this.
+   * @throws Exception
+   */
+  void assertTypeOfMarkedExpression(String code, DartType expectedStaticType,
+      DartType expectedPropagatedType) {
+    SimpleIdentifier identifier = findMarkedIdentifier(code, "; // marker");
+    if (expectedStaticType != null) {
+      expect(identifier.staticType, expectedStaticType);
+    }
+    expect(identifier.propagatedType, expectedPropagatedType);
+  }
+
+  /**
+   * Create a source object representing a file with the given [fileName] and
+   * give it an empty content. Return the source that was created.
+   */
+  FileBasedSource createNamedSource(String fileName) {
+    FileBasedSource source =
+    new FileBasedSource(FileUtilities2.createFile(fileName));
+    analysisContext2.setContents(source, "");
+    return source;
+  }
+
+  /**
+   * Return the `SimpleIdentifier` marked by `marker`. The source code must have no
+   * errors and be verifiable.
+   *
+   * @param code source code to analyze.
+   * @param marker marker identifying sought after expression in source code.
+   * @return expression marked by the marker.
+   * @throws Exception
+   */
+  SimpleIdentifier findMarkedIdentifier(String code, String marker) {
+    try {
+      Source source = addSource(code);
+      LibraryElement library = resolve2(source);
+      assertNoErrors(source);
+      verify([source]);
+      CompilationUnit unit = resolveCompilationUnit(source, library);
+      // Could generalize this further by making [SimpleIdentifier.class] a
+      // parameter.
+      return EngineTestCase.findNode(
+          unit, code, marker, (node) => node is SimpleIdentifier);
+    } catch (exception) {
+      // Is there a better exception to throw here? The point is that an
+      // assertion failure here should be a failure, in both "test_*" and
+      // "fail_*" tests. However, an assertion failure is success for the
+      // purpose of "fail_*" tests, so without catching them here "fail_*" tests
+      // can succeed by failing for the wrong reason.
+      throw new JavaException("Unexexpected assertion failure: $exception");
+    }
+  }
+}
+
+/**
+ * An AST visitor used to verify that all of the nodes in an AST structure that
+ * should have been resolved were resolved.
+ */
+class ResolutionVerifier extends RecursiveAstVisitor<Object> {
+  /**
+   * A set containing nodes that are known to not be resolvable and should
+   * therefore not cause the test to fail.
+   */
+  final Set<AstNode> _knownExceptions;
+
+  /**
+   * A list containing all of the AST nodes that were not resolved.
+   */
+  List<AstNode> _unresolvedNodes = new List<AstNode>();
+
+  /**
+   * A list containing all of the AST nodes that were resolved to an element of
+   * the wrong type.
+   */
+  List<AstNode> _wrongTypedNodes = new List<AstNode>();
+
+  /**
+   * Initialize a newly created verifier to verify that all of the identifiers
+   * in the visited AST structures that are expected to have been resolved have
+   * an element associated with them. Nodes in the set of [_knownExceptions] are
+   * not expected to have been resolved, even if they normally would have been
+   * expected to have been resolved.
+   */
+  ResolutionVerifier([this._knownExceptions]);
+
+  /**
+   * Assert that all of the visited identifiers were resolved.
+   */
+  void assertResolved() {
+    if (!_unresolvedNodes.isEmpty || !_wrongTypedNodes.isEmpty) {
+      StringBuffer buffer = new StringBuffer();
+      if (!_unresolvedNodes.isEmpty) {
+        buffer.write("Failed to resolve ");
+        buffer.write(_unresolvedNodes.length);
+        buffer.writeln(" nodes:");
+        _printNodes(buffer, _unresolvedNodes);
+      }
+      if (!_wrongTypedNodes.isEmpty) {
+        buffer.write("Resolved ");
+        buffer.write(_wrongTypedNodes.length);
+        buffer.writeln(" to the wrong type of element:");
+        _printNodes(buffer, _wrongTypedNodes);
+      }
+      fail(buffer.toString());
+    }
+  }
+
+  @override
+  Object visitAnnotation(Annotation node) {
+    node.visitChildren(this);
+    ElementAnnotation elementAnnotation = node.elementAnnotation;
+    if (elementAnnotation == null) {
+      if (_knownExceptions == null || !_knownExceptions.contains(node)) {
+        _unresolvedNodes.add(node);
+      }
+    } else if (elementAnnotation is! ElementAnnotation) {
+      _wrongTypedNodes.add(node);
+    }
+    return null;
+  }
+
+  @override
+  Object visitBinaryExpression(BinaryExpression node) {
+    node.visitChildren(this);
+    if (!node.operator.isUserDefinableOperator) {
+      return null;
+    }
+    DartType operandType = node.leftOperand.staticType;
+    if (operandType == null || operandType.isDynamic) {
+      return null;
+    }
+    return _checkResolved(
+        node, node.staticElement, (node) => node is MethodElement);
+  }
+
+  @override
+  Object visitCommentReference(CommentReference node) => null;
+
+  @override
+  Object visitCompilationUnit(CompilationUnit node) {
+    node.visitChildren(this);
+    return _checkResolved(
+        node, node.element, (node) => node is CompilationUnitElement);
+  }
+
+  @override
+  Object visitExportDirective(ExportDirective node) =>
+      _checkResolved(node, node.element, (node) => node is ExportElement);
+
+  @override
+  Object visitFunctionDeclaration(FunctionDeclaration node) {
+    node.visitChildren(this);
+    if (node.element is LibraryElement) {
+      _wrongTypedNodes.add(node);
+    }
+    return null;
+  }
+
+  @override
+  Object visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
+    node.visitChildren(this);
+    // TODO(brianwilkerson) If we start resolving function expressions, then
+    // conditionally check to see whether the node was resolved correctly.
+    return null;
+    //checkResolved(node, node.getElement(), FunctionElement.class);
+  }
+
+  @override
+  Object visitImportDirective(ImportDirective node) {
+    // Not sure how to test the combinators given that it isn't an error if the
+    // names are not defined.
+    _checkResolved(node, node.element, (node) => node is ImportElement);
+    SimpleIdentifier prefix = node.prefix;
+    if (prefix == null) {
+      return null;
+    }
+    return _checkResolved(
+        prefix, prefix.staticElement, (node) => node is PrefixElement);
+  }
+
+  @override
+  Object visitIndexExpression(IndexExpression node) {
+    node.visitChildren(this);
+    DartType targetType = node.realTarget.staticType;
+    if (targetType == null || targetType.isDynamic) {
+      return null;
+    }
+    return _checkResolved(
+        node, node.staticElement, (node) => node is MethodElement);
+  }
+
+  @override
+  Object visitLibraryDirective(LibraryDirective node) =>
+      _checkResolved(node, node.element, (node) => node is LibraryElement);
+
+  @override
+  Object visitNamedExpression(NamedExpression node) =>
+      node.expression.accept(this);
+
+  @override
+  Object visitPartDirective(PartDirective node) => _checkResolved(
+      node, node.element, (node) => node is CompilationUnitElement);
+
+  @override
+  Object visitPartOfDirective(PartOfDirective node) =>
+      _checkResolved(node, node.element, (node) => node is LibraryElement);
+
+  @override
+  Object visitPostfixExpression(PostfixExpression node) {
+    node.visitChildren(this);
+    if (!node.operator.isUserDefinableOperator) {
+      return null;
+    }
+    DartType operandType = node.operand.staticType;
+    if (operandType == null || operandType.isDynamic) {
+      return null;
+    }
+    return _checkResolved(
+        node, node.staticElement, (node) => node is MethodElement);
+  }
+
+  @override
+  Object visitPrefixedIdentifier(PrefixedIdentifier node) {
+    SimpleIdentifier prefix = node.prefix;
+    prefix.accept(this);
+    DartType prefixType = prefix.staticType;
+    if (prefixType == null || prefixType.isDynamic) {
+      return null;
+    }
+    return _checkResolved(node, node.staticElement, null);
+  }
+
+  @override
+  Object visitPrefixExpression(PrefixExpression node) {
+    node.visitChildren(this);
+    if (!node.operator.isUserDefinableOperator) {
+      return null;
+    }
+    DartType operandType = node.operand.staticType;
+    if (operandType == null || operandType.isDynamic) {
+      return null;
+    }
+    return _checkResolved(
+        node, node.staticElement, (node) => node is MethodElement);
+  }
+
+  @override
+  Object visitPropertyAccess(PropertyAccess node) {
+    Expression target = node.realTarget;
+    target.accept(this);
+    DartType targetType = target.staticType;
+    if (targetType == null || targetType.isDynamic) {
+      return null;
+    }
+    return node.propertyName.accept(this);
+  }
+
+  @override
+  Object visitSimpleIdentifier(SimpleIdentifier node) {
+    if (node.name == "void") {
+      return null;
+    }
+    if (node.staticType != null &&
+        node.staticType.isDynamic &&
+        node.staticElement == null) {
+      return null;
+    }
+    AstNode parent = node.parent;
+    if (parent is MethodInvocation) {
+      MethodInvocation invocation = parent;
+      if (identical(invocation.methodName, node)) {
+        Expression target = invocation.realTarget;
+        DartType targetType = target == null ? null : target.staticType;
+        if (targetType == null || targetType.isDynamic) {
+          return null;
+        }
+      }
+    }
+    return _checkResolved(node, node.staticElement, null);
+  }
+
+  Object _checkResolved(
+      AstNode node, Element element, Predicate<Element> predicate) {
+    if (element == null) {
+      if (_knownExceptions == null || !_knownExceptions.contains(node)) {
+        _unresolvedNodes.add(node);
+      }
+    } else if (predicate != null) {
+      if (!predicate(element)) {
+        _wrongTypedNodes.add(node);
+      }
+    }
+    return null;
+  }
+
+  String _getFileName(AstNode node) {
+    // TODO (jwren) there are two copies of this method, one here and one in
+    // StaticTypeVerifier, they should be resolved into a single method
+    if (node != null) {
+      AstNode root = node.root;
+      if (root is CompilationUnit) {
+        CompilationUnit rootCU = root;
+        if (rootCU.element != null) {
+          return rootCU.element.source.fullName;
+        } else {
+          return "<unknown file- CompilationUnit.getElement() returned null>";
+        }
+      } else {
+        return "<unknown file- CompilationUnit.getRoot() is not a CompilationUnit>";
+      }
+    }
+    return "<unknown file- ASTNode is null>";
+  }
+
+  void _printNodes(StringBuffer buffer, List<AstNode> nodes) {
+    for (AstNode identifier in nodes) {
+      buffer.write("  ");
+      buffer.write(identifier.toString());
+      buffer.write(" (");
+      buffer.write(_getFileName(identifier));
+      buffer.write(" : ");
+      buffer.write(identifier.offset);
+      buffer.writeln(")");
+    }
+  }
+}
+
+/**
+ * Shared infrastructure for [StaticTypeAnalyzer2Test] and
+ * [StrongModeStaticTypeAnalyzer2Test].
+ */
+class StaticTypeAnalyzer2TestShared extends ResolverTestCase {
+  String testCode;
+  Source testSource;
+  CompilationUnit testUnit;
+
+  /**
+   * Looks up the identifier with [name] and validates that its type type
+   * stringifies to [type] and that its generics match the given stringified
+   * output.
+   */
+  expectFunctionType(String name, String type,
+      {String elementTypeParams: '[]',
+      String typeParams: '[]',
+      String typeArgs: '[]',
+      String typeFormals: '[]'}) {
+    SimpleIdentifier identifier = findIdentifier(name);
+    // Element is either ExecutableElement or ParameterElement.
+    var element = identifier.staticElement;
+    FunctionTypeImpl functionType = identifier.staticType;
+    expect(functionType.toString(), type);
+    expect(element.typeParameters.toString(), elementTypeParams);
+    expect(functionType.typeParameters.toString(), typeParams);
+    expect(functionType.typeArguments.toString(), typeArgs);
+    expect(functionType.typeFormals.toString(), typeFormals);
+  }
+
+  /**
+   * Looks up the identifier with [name] and validates its static [type].
+   *
+   * If [type] is a string, validates that the identifier's static type
+   * stringifies to that text. Otherwise, [type] is used directly a [Matcher]
+   * to match the type.
+   *
+   * If [propagatedType] is given, also validate's the identifier's propagated
+   * type.
+   */
+  void expectIdentifierType(String name, type, [propagatedType]) {
+    SimpleIdentifier identifier = findIdentifier(name);
+    _expectType(identifier.staticType, type);
+    if (propagatedType != null) {
+      _expectType(identifier.propagatedType, propagatedType);
+    }
+  }
+
+  /**
+   * Looks up the initializer for the declaration containing [identifier] and
+   * validates its static [type].
+   *
+   * If [type] is a string, validates that the identifier's static type
+   * stringifies to that text. Otherwise, [type] is used directly a [Matcher]
+   * to match the type.
+   *
+   * If [propagatedType] is given, also validate's the identifier's propagated
+   * type.
+   */
+  void expectInitializerType(String name, type, [propagatedType]) {
+    SimpleIdentifier identifier = findIdentifier(name);
+    VariableDeclaration declaration =
+    identifier.getAncestor((node) => node is VariableDeclaration);
+    Expression initializer = declaration.initializer;
+    _expectType(initializer.staticType, type);
+    if (propagatedType != null) {
+      _expectType(initializer.propagatedType, propagatedType);
+    }
+  }
+
+  /**
+   * Validates that [type] matches [expected].
+   *
+   * If [expected] is a string, validates that the type stringifies to that
+   * text. Otherwise, [expected] is used directly a [Matcher] to match the type.
+   */
+  _expectType(DartType type, expected) {
+    if (expected is String) {
+      expect(type.toString(), expected);
+    } else {
+      expect(type, expected);
+    }
+  }
+
+  SimpleIdentifier findIdentifier(String search) {
+    SimpleIdentifier identifier = EngineTestCase.findNode(
+        testUnit, testCode, search, (node) => node is SimpleIdentifier);
+    return identifier;
+  }
+
+  void resolveTestUnit(String code) {
+    testCode = code;
+    testSource = addSource(testCode);
+    LibraryElement library = resolve2(testSource);
+    assertNoErrors(testSource);
+    verify([testSource]);
+    testUnit = resolveCompilationUnit(testSource, library);
+  }
+}