anchor.diff:    }
   
     void test_isSingleQuoted() {
  -    var b = AstTestFactory
  -        .interpolationExpression(AstTestFactory.identifier3('bb'));
  +    var b = AstTestFactory.interpolationExpression(
  +        AstTestFactory.identifier3('bb'));
       // "
       {
         var a = AstTestFactory.interpolationString('"a', "a");
  
positive.code: class ClassTypeAliasTest extends ParserTestCase {
    void test_isAbstract() {
      expect(
          AstTestFactory
              .classTypeAlias("A", null, null, null, null, null)
              .isAbstract,
          isFalse);
      expect(
          AstTestFactory
              .classTypeAlias("B", null, Keyword.ABSTRACT, null, null, null)
              .isAbstract,
          isTrue);
    }
  
negative.code:   }
  
    void test_inGetterContext_constructorFieldInitializer() {
      ConstructorFieldInitializer initializer =
          AstTestFactory.constructorFieldInitializer(
              false, 'f', AstTestFactory.integer(0));
      SimpleIdentifier identifier = initializer.fieldName;
      expect(identifier.inGetterContext(), isFalse);
    }
  