anchor.diff:    void test_getBeginToken_nonEmpty() {
       NodeList<AstNode> list =
           astFactory.nodeList<AstNode>(AstTestFactory.argumentList());
  -    AstNode node = AstTestFactory
  -        .parenthesizedExpression(AstTestFactory.booleanLiteral(true));
  +    AstNode node = AstTestFactory.parenthesizedExpression(
  +        AstTestFactory.booleanLiteral(true));
       list.add(node);
       expect(list.beginToken, same(node.beginToken));
     }
  
positive.code:   }
  
    void test_isMultiline() {
      var b = AstTestFactory
          .interpolationExpression(AstTestFactory.identifier3('bb'));
      // '
      {
        var a = AstTestFactory.interpolationString("'a", "a");
  
negative.code:   }
  
    void test_isSingleQuoted() {
      var b = AstTestFactory.interpolationExpression(
          AstTestFactory.identifier3('bb'));
      // "
      {
        var a = AstTestFactory.interpolationString('"a', "a");
  