Tests for LocalIndex and Dart index contributor.

pkg/analysis_services/test/index/dart_index_contributor_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.services.src.index.dart_index_contributor;
+
+import 'package:analysis_services/index/index.dart';
+import 'package:analysis_services/index/index_store.dart';
+import 'package:analysis_services/src/index/index_contributor.dart';
+import 'package:analysis_testing/abstract_context.dart';
+import 'package:analysis_testing/reflective_tests.dart';
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/java_engine.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:typed_mock/typed_mock.dart';
+import 'package:unittest/unittest.dart';
+
+
+main() {
+  groupSep = ' | ';
+  group('DartUnitContributor', () {
+    runReflectiveTests(DartUnitContributorTest);
+  });
+}
+
+
+/**
+ * Returns `true` if [actual] location the same properties as [expected].

[Brian Wilkerson, 2014/07/08 20:07:58]

"if [actual] location the" --> "if the [actual] location has the"

[scheglov, 2014/07/08 20:54:52]

Done.

+ */
+bool _equalsLocation(Location actual, ExpectedLocation expected) {
+  return _equalsLocationProperties(actual, expected.element, expected.offset,
+      expected.length);
+}
+
+
+/**
+ * Returns `true` if [actual] location the expected properties.

[Brian Wilkerson, 2014/07/08 20:07:58]

"if [actual] location the" --> "if the [actual] location has the"

[scheglov, 2014/07/08 20:54:52]

Done.

+ */
+bool _equalsLocationProperties(Location actual, Element expectedElement,
+    int expectedOffset, int expectedLength) {
+  return expectedElement == actual.element && expectedOffset == actual.offset &&
+      expectedLength == actual.length;
+}
+
+
+bool _equalsRecordedRelation(RecordedRelation recordedRelation,
+    Element expectedElement, Relationship expectedRelationship,
+    ExpectedLocation expectedLocation) {
+  return expectedElement == recordedRelation.element && expectedRelationship ==
+      recordedRelation.relationship && (expectedLocation == null || _equalsLocation(
+      recordedRelation.location, expectedLocation));
+}
+
+
+int _getLeadingIdentifierLength(String search) {
+  int length = 0;
+  while (length < search.length) {
+    int c = search.codeUnitAt(length);
+    if (c >= 'a'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0)) {
+      length++;
+      continue;
+    }
+    if (c >= 'A'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0)) {
+      length++;
+      continue;
+    }
+    if (c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0)) {
+      length++;
+      continue;
+    }
+    break;
+  }
+  return length;
+}
+
+@ReflectiveTestCase()
+class DartUnitContributorTest extends AbstractContextTest {
+  IndexStore store = new MockIndexStore();
+  List<RecordedRelation> recordedRelations = <RecordedRelation>[];
+
+  bool verifyNoTestUnitErrors = true;
+
+  String testCode;
+  Source testSource;
+  CompilationUnit testUnit;
+  CompilationUnitElement testUnitElement;
+  LibraryElement testLibraryElement;
+
+  void setUp() {
+    super.setUp();
+    when(store.aboutToIndexDart(context, anyObject)).thenReturn(true);
+    when(store.recordRelationship(anyObject, anyObject, anyObject)).thenInvoke(
+        (Element element, Relationship relationship, Location location) {
+      recordedRelations.add(new RecordedRelation(element, relationship,
+          location));
+    });
+  }
+
+  void test_FieldElement_noAssignedType_notLHS() {
+    _indexTestUnit('''
+class A {
+  var myField;
+  main() {
+    print(myField);
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    FieldElement fieldElement = _findElement("myField");
+    PropertyAccessorElement getterElement = fieldElement.getter;
+    // verify
+    _assertRecordedRelation(getterElement,
+        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _expectedLocation(mainElement,
+        'myField);'));
+  }
+
+  void test_definesClass() {
+    _indexTestUnit('class A {}');
+    // prepare elements
+    ClassElement classElement = _findElement("A");
+    // verify
+    _assertDefinesTopLevelElement(IndexConstants.DEFINES_CLASS,
+        _expectedLocation(classElement, 'A {}'));
+  }
+
+  void test_definesClassAlias() {
+    _indexTestUnit('''
+class Mix {}
+class MyClass = Object with Mix;''');
+    // prepare elements
+    Element classElement = _findElement("MyClass");
+    // verify
+    _assertDefinesTopLevelElement(IndexConstants.DEFINES_CLASS_ALIAS,
+        _expectedLocation(classElement, 'MyClass ='));
+  }
+
+  void test_definesFunction() {
+    _indexTestUnit('myFunction() {}');
+    // prepare elements
+    FunctionElement functionElement = _findElement("myFunction");
+    // verify
+    _assertDefinesTopLevelElement(IndexConstants.DEFINES_FUNCTION,
+        _expectedLocation(functionElement, 'myFunction() {}'));
+  }
+
+  void test_definesFunctionType() {
+    _indexTestUnit('typedef MyFunction(int p);');
+    // prepare elements
+    FunctionTypeAliasElement typeAliasElement = _findElement("MyFunction");
+    // verify
+    _assertDefinesTopLevelElement(IndexConstants.DEFINES_FUNCTION_TYPE,
+        _expectedLocation(typeAliasElement, 'MyFunction(int p);'));
+  }
+
+
+  void test_definesVariable() {
+    _indexTestUnit('var myVar = 42;');
+    // prepare elements
+    VariableElement varElement = _findElement("myVar");
+    // verify
+    _assertDefinesTopLevelElement(IndexConstants.DEFINES_VARIABLE,
+        _expectedLocation(varElement, 'myVar = 42;'));
+  }
+
+  void test_forIn() {
+    _indexTestUnit('''
+main() {
+  for (var v in []) {
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    VariableElement variableElement = _findElement("v");
+    // verify
+    _assertNoRecordedRelation(variableElement, IndexConstants.IS_READ_BY,
+        _expectedLocation(mainElement, 'v in []'));
+  }
+
+  void test_isDefinedBy_ConstructorElement() {
+    _indexTestUnit('''
+class A {
+  A() {}
+  A.foo() {}
+}''');
+    // prepare elements
+    ClassElement classA = _findElement("A");
+    ConstructorElement consA = _findNodeElementAtString("A()", (node) => node is
+        ConstructorDeclaration);
+    ConstructorElement consA_foo = _findNodeElementAtString("A.foo()", (node) =>
+        node is ConstructorDeclaration);
+    // verify
+    _assertRecordedRelation(consA, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(classA, '() {}'));
+    _assertRecordedRelation(consA_foo, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(classA, '.foo() {}', '.foo'.length));
+  }
+
+//  void test_createElementLocation() {
+//    ElementLocation elementLocation = mock(ElementLocation);
+//    Element element = IndexContributorHelper.mockElement(Element,
+//        elementLocation, 42, "myName");
+//    Location location = IndexContributor.createLocation(element);
+//    IndexContributorHelper.assertLocation(location, element, 42, "myName");
+//  }
+//
+//  void test_createElementLocation_null() {
+//    JUnitTestCase.assertSame(null, IndexContributor.createLocation(null));
+//  }
+
+  void test_isDefinedBy_NameElement_method() {
+    _indexTestUnit('''
+class A {
+  m() {}
+}''');
+    // prepare elements
+    Element methodElement = _findElement("m");
+    Element nameElement = new NameElement("m");
+    // verify
+    _assertRecordedRelation(nameElement, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(methodElement, 'm() {}'));
+  }
+
+
+  void test_isDefinedBy_NameElement_operator() {
+    _indexTestUnit('''
+class A {
+  operator +(o) {}
+}''');
+    // prepare elements
+    Element methodElement = _findElement("+");
+    Element nameElement = new NameElement("+");
+    // verify
+    _assertRecordedRelation(nameElement, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(methodElement, '+(o) {}', 1));
+  }
+
+  void test_isExtendedBy_ClassDeclaration() {
+    _indexTestUnit('''
+class A {} // 1
+class B extends A {} // 2
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementB = _findElement("B");
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_EXTENDED_BY,
+        _expectedLocation(classElementB, 'A {} // 2'));
+  }
+
+  void test_isExtendedBy_ClassDeclaration_Object() {
+    _indexTestUnit('''
+class A {} // 1
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementObject = classElementA.supertype.element;
+    // verify
+    _assertRecordedRelation(classElementObject, IndexConstants.IS_EXTENDED_BY,
+        _expectedLocation(classElementA, 'A {}', 0));
+  }
+
+  void test_isExtendedBy_ClassTypeAlias() {
+    _indexTestUnit('''
+class A {} // 1
+class B {} // 2
+class C = A with B; // 3
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementC = _findElement("C");
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_EXTENDED_BY,
+        _expectedLocation(classElementC, 'A with'));
+  }
+
+  void test_isImplementedBy_ClassDeclaration() {
+    _indexTestUnit('''
+class A {} // 1
+class B implements A {} // 2
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementB = _findElement("B");
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_IMPLEMENTED_BY,
+        _expectedLocation(classElementB, 'A {} // 2'));
+  }
+
+  void test_isImplementedBy_ClassTypeAlias() {
+    _indexTestUnit('''
+class A {} // 1
+class B {} // 2
+class C = Object with A implements B; // 3
+''');
+    // prepare elements
+    ClassElement classElementB = _findElement("B");
+    ClassElement classElementC = _findElement("C");
+    // verify
+    _assertRecordedRelation(classElementB, IndexConstants.IS_IMPLEMENTED_BY,
+        _expectedLocation(classElementC, 'B; // 3'));
+  }
+
+
+  void test_isInvokedByQualified_FieldElement() {
+    _indexTestUnit('''
+class A {
+  var field;
+  main() {
+    this.field();
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    FieldElement fieldElement = _findElement("field");
+    PropertyAccessorElement getterElement = fieldElement.getter;
+    // verify
+    _assertRecordedRelation(getterElement,
+        IndexConstants.IS_INVOKED_BY_QUALIFIED, _expectedLocation(mainElement,
+        'field();'));
+  }
+
+
+  void test_isInvokedByQualified_MethodElement() {
+    _indexTestUnit('''
+class A {
+  foo() {}
+  main() {
+    this.foo();
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element methodElement = _findElement("foo");
+    // verify
+    var location = _expectedLocation(mainElement, 'foo();');
+    _assertRecordedRelation(methodElement,
+        IndexConstants.IS_INVOKED_BY_QUALIFIED, location);
+    _assertNoRecordedRelation(methodElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED, location);
+  }
+
+  void test_isInvokedByQualified_MethodElement_propagatedType() {
+    _indexTestUnit('''
+class A {
+  foo() {}
+}
+main() {
+  var a = new A();
+  a.foo();
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element methodElement = _findElement("foo");
+    // verify
+    _assertRecordedRelation(methodElement,
+        IndexConstants.IS_INVOKED_BY_QUALIFIED, _expectedLocation(mainElement,
+        'foo();'));
+  }
+
+  void test_isInvokedByUnqualified_MethodElement() {
+    _indexTestUnit('''
+class A {
+  foo() {}
+  main() {
+    foo();
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element methodElement = _findElement("foo");
+    // verify
+    _assertRecordedRelation(methodElement,
+        IndexConstants.IS_INVOKED_BY_UNQUALIFIED, _expectedLocation(mainElement,
+        'foo();'));
+  }
+
+  void test_isInvokedBy_FunctionElement() {
+    _indexTestUnit('''
+foo() {}
+main() {
+  foo();
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    FunctionElement functionElement = _findElement("foo");
+    // verify
+    _assertRecordedRelation(functionElement, IndexConstants.IS_INVOKED_BY,
+        _expectedLocation(mainElement, 'foo();'));
+  }
+
+  void test_isInvokedBy_LocalVariableElement() {
+    _indexTestUnit('''
+main() {
+  var v;
+  v();
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element element = _findElement("v");
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY,
+        _expectedLocation(mainElement, 'v();'));
+  }
+
+  void test_isInvokedBy_ParameterElement() {
+    _indexTestUnit('''
+main(p()) {
+  p();
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element element = _findElement("p");
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY,
+        _expectedLocation(mainElement, 'p();'));
+  }
+
+  void test_isMixedInBy_ClassDeclaration() {
+    _indexTestUnit('''
+class A {} // 1
+class B extends Object with A {} // 2
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementB = _findElement("B");
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_MIXED_IN_BY,
+        _expectedLocation(classElementB, 'A {} // 2'));
+  }
+
+  void test_isMixedInBy_ClassTypeAlias() {
+    _indexTestUnit('''
+class A {} // 1
+class B = Object with A; // 2
+''');
+    // prepare elements
+    ClassElement classElementA = _findElement("A");
+    ClassElement classElementB = _findElement("B");
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_MIXED_IN_BY,
+        _expectedLocation(classElementB, 'A; // 2'));
+  }
+
+  void test_isReadBy_ParameterElement() {
+    _indexTestUnit('''
+main(var p) {
+  print(p);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element parameterElement = _findElement("p");
+    // verify
+    _assertRecordedRelation(parameterElement, IndexConstants.IS_READ_BY,
+        _expectedLocation(mainElement, 'p);'));
+  }
+
+  void test_isReadBy_VariableElement() {
+    _indexTestUnit('''
+main() {
+  var v = 0;
+  print(v);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element variableElement = _findElement("v");
+    // verify
+    _assertRecordedRelation(variableElement, IndexConstants.IS_READ_BY,
+        _expectedLocation(mainElement, 'v);'));
+  }
+
+  void test_isReadWrittenBy_ParameterElement() {
+    _indexTestUnit('''
+main(int p) {
+  p += 1;
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element parameterElement = _findElement("p");
+    // verify
+    _assertRecordedRelation(parameterElement, IndexConstants.IS_READ_WRITTEN_BY,
+        _expectedLocation(mainElement, 'p += 1'));
+  }
+
+  void test_isReadWrittenBy_VariableElement() {
+    _indexTestUnit('''
+main() {
+  var v = 0;
+  v += 1;
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element variableElement = _findElement("v");
+    // verify
+    _assertRecordedRelation(variableElement, IndexConstants.IS_READ_WRITTEN_BY,
+        _expectedLocation(mainElement, 'v += 1'));
+  }
+
+  void test_isReferencedByQualifiedResolved_NameElement_field() {
+    _indexTestUnit('''
+class A {
+  int field;
+}
+main(A a) {
+  print(a.field);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    Element nameElement = new NameElement('field');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, 'field);'));
+  }
+
+  void test_isReferencedByQualifiedResolved_NameElement_method() {
+    _indexTestUnit('''
+class A {
+  method() {}
+}
+main(A a) {
+  a.method();
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    Element nameElement = new NameElement('method');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, 'method();'));
+  }
+
+  void test_isReferencedByQualifiedResolved_NameElement_operator() {
+    _indexTestUnit('''
+class A {
+  operator +(o) {}
+  operator -(o) {}
+  operator ~() {}
+  operator ==(o) {}
+}
+main(A a) {
+  a + 5;
+  a += 5;
+  a == 5;
+  ++a;
+  --a;
+  ~a;
+  a++;
+  a--;
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    // binary
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '+ 5', '+'.length));
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '+= 5', '+='.length));
+    _assertRecordedRelation(new NameElement('=='),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '== 5', '=='.length));
+    // prefix
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '++a', '++'.length));
+    _assertRecordedRelation(new NameElement('-'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '--a', '--'.length));
+    _assertRecordedRelation(new NameElement('~'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '~a', '~'.length));
+    // postfix
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '++;', '++'.length));
+    _assertRecordedRelation(new NameElement('-'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _expectedLocation(
+        mainElement, '--;', '--'.length));
+  }
+
+  void test_isReferencedByQualifiedUnresolved_NameElement_field() {
+    _indexTestUnit('''
+class A {
+  int field;
+}
+main(var a) {
+  print(a.field);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    FieldElement fieldElement = _findElement('field');
+    Element nameElement = new NameElement('field');
+    // verify
+    _assertRecordedRelation(nameElement, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(fieldElement, 'field;'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, 'field);'));
+  }
+
+  void test_isReferencedByQualifiedUnresolved_NameElement_method() {
+    _indexTestUnit('''
+class A {
+  method() {}
+}
+main(var a) {
+  a.method();
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    MethodElement methodElement = _findElement('method');
+    Element nameElement = new NameElement('method');
+    // verify
+    _assertRecordedRelation(nameElement, IndexConstants.IS_DEFINED_BY,
+        _expectedLocation(methodElement, 'method() {}'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, 'method();'));
+  }
+
+  void test_isReferencedByQualifiedUnresolved_NameElement_operator() {
+    _indexTestUnit('''
+class A {
+  operator +(o) {}
+  operator -(o) {}
+  operator ~() {}
+  operator ==(o) {}
+}
+main(a) {
+  a + 5;
+  a += 5;
+  a == 5;
+  ++a;
+  --a;
+  ~a;
+  a++;
+  a--;
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    // binary
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '+ 5', '+'.length));
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '+= 5', '+='.length));
+    _assertRecordedRelation(new NameElement('=='),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '== 5', '=='.length));
+    // prefix
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '++a', '++'.length));
+    _assertRecordedRelation(new NameElement('-'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '--a', '--'.length));
+    _assertRecordedRelation(new NameElement('~'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '~a', '~'.length));
+    // postfix
+    _assertRecordedRelation(new NameElement('+'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '++;', '++'.length));
+    _assertRecordedRelation(new NameElement('-'),
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _expectedLocation(
+        mainElement, '--;', '--'.length));
+  }
+
+  void test_isReferencedByQualified_ConstructorElement() {
+    _indexTestUnit('''
+class A implements B {
+  A() {}
+  A.foo() {}
+}
+class B extends A {
+  B() : super(); // marker-1
+  B.foo() : super.foo(); // marker-2
+  factory B.bar() = A.foo; // marker-3
+}
+main() {
+  new A(); // marker-main-1
+  new A.foo(); // marker-main-2
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    var isConstructor = (node) => node is ConstructorDeclaration;
+    ConstructorElement consA = _findNodeElementAtString("A()", isConstructor);
+    ConstructorElement consA_foo = _findNodeElementAtString("A.foo()",
+        isConstructor);
+    ConstructorElement consB = _findNodeElementAtString("B()", isConstructor);
+    ConstructorElement consB_foo = _findNodeElementAtString("B.foo()",
+        isConstructor);
+    ConstructorElement consB_bar = _findNodeElementAtString("B.bar()",
+        isConstructor);
+    // A()
+    _assertRecordedRelation(consA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(consB, '(); // marker-1', 0));
+    _assertRecordedRelation(consA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, '(); // marker-main-1', 0));
+    // A.foo()
+    _assertRecordedRelation(consA_foo, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(consB_foo, '.foo(); // marker-2', '.foo'.length));
+    _assertRecordedRelation(consA_foo, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(consB_bar, '.foo; // marker-3', '.foo'.length));
+    _assertRecordedRelation(consA_foo, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, '.foo(); // marker-main-2', '.foo'.length));
+  }
+
+  void test_isReferencedByQualified_ConstructorElement_classTypeAlias() {
+    _indexTestUnit('''
+class M {}
+class A implements B {
+  A() {}
+  A.named() {}
+}
+class B = A with M;
+main() {
+  new B(); // marker-main-1
+  new B.named(); // marker-main-2
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    var isConstructor = (node) => node is ConstructorDeclaration;
+    ConstructorElement consA = _findNodeElementAtString("A()", isConstructor);
+    ConstructorElement consA_named = _findNodeElementAtString("A.named()",
+        isConstructor);
+    // verify
+    _assertRecordedRelation(consA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, '(); // marker-main-1', 0));
+    _assertRecordedRelation(consA_named, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, '.named(); // marker-main-2', '.named'.length));
+  }
+
+  void test_isReferencedByQualified_FieldElement() {
+    _indexTestUnit('''
+class A {
+  static var field;
+}
+main() {
+  A.field = 1;
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    FieldElement fieldElement = _findElement('field');
+    PropertyAccessorElement setterElement = fieldElement.setter;
+    // verify
+    _assertRecordedRelation(setterElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED, _expectedLocation(mainElement,
+        'field = 1'));
+  }
+
+  void test_isReferencedByQualified_MethodElement() {
+    _indexTestUnit('''
+class A {
+  foo() {}
+  main() {
+    print(this.foo);
+  }
+}
+''');
+    // prepare elements
+    Element fooElement = _findElement('foo');
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(fooElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED, _expectedLocation(mainElement,
+        'foo);'));
+  }
+
+  void test_isReferencedByQualified_MethodElement_operator_binary() {
+    _indexTestUnit('''
+class A {
+  operator +(other) => this;
+}
+main(A a) {
+  print(a + 1);
+  a += 2;
+  ++a;
+  a++;
+}
+''');
+    // prepare elements
+    Element element = _findElement('+');
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '+ 1', "+".length));
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '+= 2', "+=".length));
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '++a;', "++".length));
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '++;', "++".length));
+  }
+
+  void test_isReferencedByQualified_MethodElement_operator_index() {
+    _indexTestUnit('''
+class A {
+  operator [](i) => null;
+  operator []=(i, v) {}
+}
+main(A a) {
+  print(a[0]);
+  a[1] = 42;
+}
+''');
+    // prepare elements
+    MethodElement readElement = _findElement("[]");
+    MethodElement writeElement = _findElement("[]=");
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(readElement, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '[0]', "[".length));
+    _assertRecordedRelation(writeElement,
+        IndexConstants.IS_INVOKED_BY_QUALIFIED, _expectedLocation(mainElement, '[1] =',
+        "[".length));
+  }
+
+  void test_isReferencedByQualified_MethodElement_operator_prefix() {
+    _indexTestUnit('''
+class A {
+  A operator ~() => this;
+}
+main(A a) {
+  print(~a);
+}
+''');
+    // prepare elements
+    MethodElement element = _findElement("~");
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY_QUALIFIED,
+        _expectedLocation(mainElement, '~a', "~".length));
+  }
+
+  void test_isReferencedByQualified_PropertyAccessorElement_method_getter() {
+    _indexTestUnit('''
+class A {
+  get foo => 42;
+  main() {
+    print(this.foo);
+  }
+}
+''');
+    // prepare elements
+    PropertyAccessorElement element = _findNodeElementAtString('foo =>');
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_REFERENCED_BY_QUALIFIED,
+        _expectedLocation(mainElement, 'foo);'));
+    _assertNoRecordedRelation(element, IndexConstants.IS_REFERENCED_BY, null);
+  }
+
+  void test_isReferencedByQualified_PropertyAccessorElement_method_setter() {
+    _indexTestUnit('''
+class A {
+  set foo(x) {}
+  main() {
+    this.foo = 42;
+  }
+}
+''');
+    // prepare elements
+    PropertyAccessorElement element = _findNodeElementAtString('foo(x)');
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_REFERENCED_BY_QUALIFIED,
+        _expectedLocation(mainElement, 'foo = 42;'));
+    _assertNoRecordedRelation(element, IndexConstants.IS_REFERENCED_BY, null);
+  }
+
+  void test_isReferencedByQualified_PropertyAccessorElement_topLevelField() {
+    addSource('/lib.dart', '''
+library lib;
+var myVar;
+''');
+    _indexTestUnit('''
+import 'lib.dart' as pref;
+main() {
+  pref.myVar = 1;
+  print(pref.myVar);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    ImportElement importElement = testLibraryElement.imports[0];
+    CompilationUnitElement impUnit =
+        importElement.importedLibrary.definingCompilationUnit;
+    TopLevelVariableElement myVar = impUnit.topLevelVariables[0];
+    PropertyAccessorElement getter = myVar.getter;
+    PropertyAccessorElement setter = myVar.setter;
+    // verify
+    _assertRecordedRelation(setter, IndexConstants.IS_REFERENCED_BY_QUALIFIED,
+        _expectedLocation(mainElement, 'myVar = 1'));
+    _assertRecordedRelation(getter, IndexConstants.IS_REFERENCED_BY_QUALIFIED,
+        _expectedLocation(mainElement, 'myVar);'));
+  }
+
+  void test_isReferencedByUnqualified_FieldElement() {
+    _indexTestUnit('''
+class A {
+  var field;
+  main() {
+    field = 5;
+    print(field);
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    FieldElement fieldElement = _findElement("field");
+    PropertyAccessorElement getter = fieldElement.getter;
+    PropertyAccessorElement setter = fieldElement.setter;
+    // verify
+    _assertRecordedRelation(setter, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
+        _expectedLocation(mainElement, 'field = 5'));
+    _assertRecordedRelation(getter, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
+        _expectedLocation(mainElement, 'field);'));
+  }
+
+  void test_isReferencedByUnqualified_MethodElement() {
+    _indexTestUnit('''
+class A {
+  method() {}
+  main() {
+    print(method);
+  }
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    MethodElement methodElement = _findElement("method");
+    // verify
+    _assertRecordedRelation(methodElement,
+        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _expectedLocation(mainElement,
+        'method);'));
+    _assertNoRecordedRelation(methodElement, IndexConstants.IS_REFERENCED_BY,
+        null);
+  }
+
+  void test_isReferencedByUnqualified_TopLevelVariableElement() {
+    _indexTestUnit('''
+var topVariable;
+main() {
+  topVariable = 5;
+  print(topVariable);
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    TopLevelVariableElement variableElement = _findElement("topVariable");
+    // verify
+    _assertRecordedRelation(variableElement.setter,
+        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _expectedLocation(mainElement,
+        'topVariable = 5'));
+    _assertRecordedRelation(variableElement.getter,
+        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _expectedLocation(mainElement,
+        'topVariable);'));
+  }
+
+  void test_isReferencedBy_ClassElement() {
+    _indexTestUnit('''
+class A {
+  static var field;
+}
+main(A p) {
+  A v;
+  new A(); // 2
+  A.field = 1;
+  print(A.field); // 3
+}
+''');
+    // prepare elements
+    ClassElement aElement = _findElement("A");
+    Element mainElement = _findElement("main");
+    ParameterElement pElement = _findElement("p");
+    VariableElement vElement = _findElement("v");
+    // verify
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(pElement, 'A p) {'));
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(vElement, 'A v;'));
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'A(); // 2'));
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'A.field = 1;'));
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'A.field); // 3'));
+  }
+
+  void test_isReferencedBy_ClassTypeAlias() {
+    _indexTestUnit('''
+class A {}
+class B = Object with A;
+main(B p) {
+  B v;
+}
+''');
+    // prepare elements
+    ClassElement bElement = _findElement("B");
+    ParameterElement pElement = _findElement("p");
+    VariableElement vElement = _findElement("v");
+    // verify
+    _assertRecordedRelation(bElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(pElement, 'B p) {'));
+    _assertRecordedRelation(bElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(vElement, 'B v;'));
+  }
+
+  void test_isReferencedBy_CompilationUnitElement() {
+    addSource('/my_unit.dart', 'part of my_lib;');
+    _indexTestUnit('''
+library my_lib;
+part 'my_unit.dart';
+''');
+    // prepare elements
+    CompilationUnitElement myUnitElement = testLibraryElement.parts[0];
+    // verify
+    _assertRecordedRelation(myUnitElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, "'my_unit.dart';", "'my_unit.dart'".length));
+  }
+
+  void test_isReferencedBy_ConstructorFieldInitializer() {
+    _indexTestUnit('''
+class A {
+  int field;
+  A() : field = 5;
+}
+''');
+    // prepare elements
+    ConstructorElement constructorElement = _findNodeElementAtString("A()",
+        (node) => node is ConstructorDeclaration);
+    FieldElement fieldElement = _findElement("field");
+    // verify
+    _assertRecordedRelation(fieldElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(constructorElement, 'field = 5'));
+  }
+
+  void test_isReferencedBy_FieldFormalParameterElement() {
+    _indexTestUnit('''
+class A {
+  int field;
+  A(this.field);
+}
+''');
+    // prepare elements
+    FieldElement fieldElement = _findElement("field");
+    Element fieldParameterElement = _findNodeElementAtString("field);");
+    // verify
+    _assertRecordedRelation(fieldElement,
+        IndexConstants.IS_REFERENCED_BY_QUALIFIED, _expectedLocation(
+        fieldParameterElement, 'field);'));
+  }
+
+  void test_isReferencedBy_FunctionElement() {
+    _indexTestUnit('''
+foo() {}
+main() {
+  print(foo);
+  print(foo());
+}
+''');
+    // prepare elements
+    FunctionElement element = _findElement("foo");
+    Element mainElement = _findElement("main");
+    // "referenced" here
+    _assertRecordedRelation(element, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'foo);'));
+    // only "invoked", but not "referenced"
+    {
+      _assertRecordedRelation(element, IndexConstants.IS_INVOKED_BY,
+          _expectedLocation(mainElement, 'foo());'));
+      _assertNoRecordedRelation(element, IndexConstants.IS_REFERENCED_BY,
+          _expectedLocation(mainElement, 'foo());'));
+    }
+  }
+
+  void test_isReferencedBy_FunctionTypeAliasElement() {
+    _indexTestUnit('''
+typedef A();
+main(A p) {
+}
+''');
+    // prepare elements
+    Element aElement = _findElement('A');
+    Element pElement = _findElement('p');
+    // verify
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(pElement, 'A p) {'));
+  }
+
+  void test_isReferencedBy_ImportElement_noPrefix() {
+    addSource('/lib.dart', '''
+library lib;
+var myVar;
+myFunction() {}
+myToHide() {}
+''');
+    _indexTestUnit('''
+import 'lib.dart' show myVar, myFunction hide myToHide;
+main() {
+  myVar = 1;
+  myFunction();
+  print(0);
+}
+''');
+    // prepare elements
+    ImportElement importElement = testLibraryElement.imports[0];
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'myVar = 1;', 0));
+    _assertRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'myFunction();', 0));
+    _assertNoRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'print(0);', 0));
+    // no references from import combinators
+    _assertNoRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, 'myVar, ', 0));
+    _assertNoRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, 'myFunction hide', 0));
+    _assertNoRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, 'myToHide;', 0));
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix() {
+    addSource('/libA.dart', '''
+library libA;
+var myVar;
+''');
+    addSource('/libB.dart', '''
+library libB;
+class MyClass {}
+''');
+    _indexTestUnit('''
+import 'libA.dart' as pref;
+import 'libB.dart' as pref;
+main() {
+  pref.myVar = 1;
+  new pref.MyClass();
+}
+''');
+    // prepare elements
+    ImportElement importElementA = testLibraryElement.imports[0];
+    ImportElement importElementB = testLibraryElement.imports[1];
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(importElementA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.myVar = 1;', 'pref.'.length));
+    _assertRecordedRelation(importElementB, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.MyClass();', 'pref.'.length));
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_combinators() {
+    addSource('/lib.dart', '''
+library lib;
+class A {}
+class B {}
+''');
+    _indexTestUnit('''
+import 'lib.dart' as pref show A;
+import 'lib.dart' as pref show B;
+import 'lib.dart';
+import 'lib.dart' as otherPrefix;
+main() {
+  new pref.A();
+  new pref.B();
+}
+''');
+    // prepare elements
+    ImportElement importElementA = testLibraryElement.imports[0];
+    ImportElement importElementB = testLibraryElement.imports[1];
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(importElementA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.A();', 'pref.'.length));
+    _assertRecordedRelation(importElementB, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.B();', 'pref.'.length));
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_invocation() {
+    addSource('/lib.dart', '''
+library lib;
+myFunc() {}
+''');
+    _indexTestUnit('''
+import 'lib.dart' as pref;
+main() {
+  pref.myFunc();
+}
+''');
+    // prepare elements
+    ImportElement importElement = testLibraryElement.imports[0];
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.myFunc();', 'pref.'.length));
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_oneCandidate() {
+    addSource('/lib.dart', '''
+library lib;
+class A {}
+class B {}
+''');
+    _indexTestUnit('''
+import 'lib.dart' as pref show A;
+main() {
+  new pref.A();
+}
+''');
+    // prepare elements
+    ImportElement importElement = testLibraryElement.imports[0];
+    Element mainElement = _findElement('main');
+    // verify
+    _assertRecordedRelation(importElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'pref.A();', 'pref.'.length));
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_unresolvedElement() {
+    verifyNoTestUnitErrors = false;
+    addSource('/lib.dart', '''
+library lib;
+''');
+    _indexTestUnit('''
+import 'lib.dart' as pref;
+main() {
+  pref.myVar = 1;
+}
+''');
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_wrongInvocation() {
+    verifyNoTestUnitErrors = false;
+    _indexTestUnit('''
+import 'dart:math' as m;
+main() {
+  m();
+}''');
+  }
+
+  void test_isReferencedBy_ImportElement_withPrefix_wrongPrefixedIdentifier() {
+    verifyNoTestUnitErrors = false;
+    _indexTestUnit('''
+import 'dart:math' as m;
+main() {
+  x.m;
+}
+''');
+  }
+
+  void test_isReferencedBy_LabelElement() {
+    _indexTestUnit('''
+main() {
+  L: while (true) {
+    break L;
+  }
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    Element element = _findElement('L');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'L;'));
+  }
+
+  void test_isReferencedBy_LibraryElement_export() {
+    addSource('/lib.dart', '''
+library lib;
+''');
+    _indexTestUnit('''
+export 'lib.dart';
+''');
+    // prepare elements
+    LibraryElement libElement = testLibraryElement.exportedLibraries[0];
+    CompilationUnitElement libUnitElement = libElement.definingCompilationUnit;
+    // verify
+    _assertRecordedRelation(libUnitElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, "'lib.dart'", "'lib.dart'".length));
+  }
+
+  void test_isReferencedBy_LibraryElement_import() {
+    addSource('/lib.dart', '''
+library lib;
+''');
+    _indexTestUnit('''
+import 'lib.dart';
+''');
+    // prepare elements
+    LibraryElement libElement = testLibraryElement.imports[0].importedLibrary;
+    CompilationUnitElement libUnitElement = libElement.definingCompilationUnit;
+    // verify
+    _assertRecordedRelation(libUnitElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, "'lib.dart'", "'lib.dart'".length));
+  }
+
+  void test_isReferencedBy_ParameterElement() {
+    _indexTestUnit('''
+foo({var p}) {}
+main() {
+  foo(p: 1);
+}
+''');
+    // prepare elements
+    Element mainElement = _findElement('main');
+    Element element = _findElement('p');
+    // verify
+    _assertRecordedRelation(element, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(mainElement, 'p: 1'));
+  }
+
+  void test_isReferencedBy_TypeParameterElement() {
+    _indexTestUnit('''
+class A<T> {
+  T f;
+  foo(T p) {
+    T v;
+  }
+}
+''');
+    // prepare elements
+    Element typeParameterElement = _findElement('T');
+    Element fieldElement = _findElement('f');
+    Element parameterElement = _findElement('p');
+    Element variableElement = _findElement('v');
+    // verify
+    _assertRecordedRelation(typeParameterElement,
+        IndexConstants.IS_REFERENCED_BY, _expectedLocation(fieldElement, 'T f'));
+    _assertRecordedRelation(typeParameterElement,
+        IndexConstants.IS_REFERENCED_BY, _expectedLocation(parameterElement, 'T p'));
+    _assertRecordedRelation(typeParameterElement,
+        IndexConstants.IS_REFERENCED_BY, _expectedLocation(variableElement, 'T v'));
+  }
+
+  /**
+   * There was a bug in the AST structure, when single [Comment] was cloned and
+   * assigned to both [FieldDeclaration] and [VariableDeclaration].
+   *
+   * This caused duplicate indexing.
+   * Here we test that the problem is fixed one way or another.
+   */
+  void test_isReferencedBy_identifierInComment() {
+    _indexTestUnit('''
+class A {}
+/// [A] text
+var myVariable = null;
+''');
+    // prepare elements
+    Element aElement = _findElement('A');
+    Element variableElement = _findElement('myVariable');
+    // verify
+    _assertRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, 'A] text'));
+    _assertNoRecordedRelation(aElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(variableElement, 'A] text'));
+  }
+
+  void test_isReferencedBy_libraryName() {
+    Source libSource = addSource('/lib.dart', '''
+library lib;
+part 'test.dart';
+''');
+    testCode = 'part of lib;';
+    testSource = addSource('/test.dart', testCode);
+    testUnit = resolveDartUnit(testSource, libSource);
+    testUnitElement = testUnit.element;
+    testLibraryElement = testUnitElement.library;
+    indexDartUnit(store, context, testUnit);
+    // verify
+    _assertRecordedRelation(testLibraryElement, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(testUnitElement, "lib;"));
+  }
+
+  void test_isReferencedBy_typeInVariableList() {
+    _indexTestUnit('''
+class A {}
+A myVariable = null;
+''');
+    // prepare elements
+    Element classElementA = _findElement('A');
+    Element variableElement = _findElement('myVariable');
+    // verify
+    _assertRecordedRelation(classElementA, IndexConstants.IS_REFERENCED_BY,
+        _expectedLocation(variableElement, 'A myVariable'));
+  }
+
+  void test_isWrittenBy_ParameterElement() {
+    _indexTestUnit('''
+main(var p) {
+  p = 1;
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    ParameterElement pElement = _findElement("p");
+    // verify
+    _assertRecordedRelation(pElement, IndexConstants.IS_WRITTEN_BY,
+        _expectedLocation(mainElement, 'p = 1'));
+  }
+
+  void test_isWrittenBy_VariableElement() {
+    _indexTestUnit('''
+main() {
+  var v = 0;
+  v = 1;
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    LocalVariableElement vElement = _findElement("v");
+    // verify
+    _assertRecordedRelation(vElement, IndexConstants.IS_WRITTEN_BY,
+        _expectedLocation(mainElement, 'v = 1'));
+  }
+
+  void test_nameIsInvokedBy() {
+    _indexTestUnit('''
+class A {
+  test(x) {}
+}
+main(A a, p) {
+  a.test(1);
+  p.test(2);
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element nameElement = new NameElement('test');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_INVOKED_BY_RESOLVED, _expectedLocation(mainElement,
+        'test(1)'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_INVOKED_BY_UNRESOLVED, _expectedLocation(mainElement,
+        'test(2)'));
+    _assertNoRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_READ_BY_UNRESOLVED, _expectedLocation(mainElement,
+        'test(2)'));
+  }
+
+  void test_nameIsReadBy() {
+    _indexTestUnit('''
+class A {
+  var test;
+}
+main(A a, p) {
+  print(a.test); // a
+  print(p.test); // p
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element nameElement = new NameElement('test');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_READ_BY_RESOLVED, _expectedLocation(mainElement,
+        'test); // a'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_READ_BY_UNRESOLVED, _expectedLocation(mainElement,
+        'test); // p'));
+  }
+
+  void test_nameIsReadWrittenBy() {
+    _indexTestUnit('''
+class A {
+  var test;
+}
+main(A a, p) {
+  a.test += 1;
+  p.test += 2;
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element nameElement = new NameElement('test');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_READ_WRITTEN_BY_RESOLVED, _expectedLocation(mainElement,
+        'test += 1'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_READ_WRITTEN_BY_UNRESOLVED, _expectedLocation(
+        mainElement, 'test += 2'));
+  }
+
+  void test_nameIsWrittenBy() {
+    _indexTestUnit('''
+class A {
+  var test;
+}
+main(A a, p) {
+  a.test = 1;
+  p.test = 2;
+}''');
+    // prepare elements
+    Element mainElement = _findElement("main");
+    Element nameElement = new NameElement('test');
+    // verify
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_WRITTEN_BY_RESOLVED, _expectedLocation(mainElement,
+        'test = 1'));
+    _assertRecordedRelation(nameElement,
+        IndexConstants.NAME_IS_WRITTEN_BY_UNRESOLVED, _expectedLocation(mainElement,
+        'test = 2'));
+  }
+
+  void test_nullUnit() {
+    indexDartUnit(store, context, null);
+  }
+
+  void test_nullUnitElement() {
+    CompilationUnit unit = new CompilationUnit(null, null, [], [], null);
+    indexDartUnit(store, context, unit);
+  }
+
+  void _assertDefinesTopLevelElement(Relationship relationship,
+      ExpectedLocation expectedLocation) {
+    _assertRecordedRelation(testLibraryElement, relationship, expectedLocation);
+    _assertRecordedRelation(UniverseElement.INSTANCE, relationship,
+        expectedLocation);
+  }
+
+  void _assertNoErrorsInSource() {
+    List<AnalysisError> errors = context.getErrors(testSource).errors;
+    expect(errors, isEmpty);
+  }
+
+  /**
+   * Asserts that [recordedRelations] has no item with the specified properties.
+   */
+  void _assertNoRecordedRelation(Element element, Relationship relationship,
+      ExpectedLocation location) {
+    for (RecordedRelation recordedRelation in recordedRelations) {
+      if (_equalsRecordedRelation(recordedRelation, element, relationship,
+          location)) {
+        fail('not expected: ${recordedRelation} in\n' + recordedRelations.join(
+            '\n'));
+      }
+    }
+  }
+
+  /**
+   * Asserts that [recordedRelations] has an item with the expected properties.
+   */
+  Location _assertRecordedRelation(Element expectedElement,
+      Relationship expectedRelationship, ExpectedLocation expectedLocation) {
+    for (RecordedRelation recordedRelation in recordedRelations) {
+      if (_equalsRecordedRelation(recordedRelation, expectedElement,
+          expectedRelationship, expectedLocation)) {
+        return recordedRelation.location;
+      }
+    }
+    fail("not found\n$expectedElement $expectedRelationship "
+        "in $expectedLocation in\n" + recordedRelations.join('\n'));
+    return null;
+  }
+
+  ExpectedLocation _expectedLocation(Element element, String search, [int length
+      = -1]) {
+    int offset = _findOffset(search);
+    if (length == -1) {
+      length = _getLeadingIdentifierLength(search);
+    }
+    return new ExpectedLocation(element, offset, length);
+  }
+
+  Element _findElement(String name, [ElementKind kind]) {
+    return findChildElement(testUnitElement, name, kind);
+  }
+
+  AstNode _findNodeAtOffset(int offset, [Predicate<AstNode> predicate]) {
+    AstNode result = new NodeLocator.con1(offset).searchWithin(testUnit);
+    if (result != null && predicate != null) {
+      result = result.getAncestor(predicate);
+    }
+    return result;
+  }
+
+  AstNode _findNodeAtString(String search, [Predicate<AstNode> predicate]) {
+    int offset = _findOffset(search);
+    return _findNodeAtOffset(offset, predicate);
+  }
+
+  Element _findNodeElementAtString(String search,
+      [Predicate<AstNode> predicate]) {
+    AstNode node = _findNodeAtString(search, predicate);
+    if (node == null) {
+      return null;
+    }
+    return ElementLocator.locate(node);
+  }
+
+  int _findOffset(String search) {
+    int offset = testCode.indexOf(search);
+    expect(offset, isNonNegative, reason: "Not found '$search' in\n$testCode");
+    return offset;
+  }
+
+  void _indexTestUnit(String code) {
+    testCode = code;
+    testSource = addSource('/test.dart', code);
+    testUnit = resolveLibraryUnit(testSource);
+    if (verifyNoTestUnitErrors) {
+      _assertNoErrorsInSource();
+    }
+    testUnitElement = testUnit.element;
+    testLibraryElement = testUnitElement.library;
+    indexDartUnit(store, context, testUnit);
+  }
+}
+
+class ExpectedLocation {
+  Element element;
+  int offset;
+  int length;
+
+  ExpectedLocation(this.element, this.offset, this.length);
+
+  @override
+  String toString() {
+    return 'ExpectedLocation(element=$element; offset=$offset; length=$length)';
+  }
+}
+
+class MockIndexStore extends TypedMock implements IndexStore {
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+
+/**
+ * Information about a relation recorded into {@link IndexStore}.
+ */
+class RecordedRelation {
+  final Element element;
+  final Relationship relationship;
+  final Location location;
+
+  RecordedRelation(this.element, this.relationship, this.location);
+
+  @override
+  String toString() {
+    return 'RecordedRelation(element=$element; relationship=$relationship; '
+        'location=$location)';
+  }
+}