anchor.diff:      setUp(() {
         classB = library.classes.singleWhere((c) => c.name == 'B');
         m = classB.instanceMethods.first;
  -      m3 = library
  -          .classes
  +      m3 = library.classes
             .singleWhere((c) => c.name == 'Apple').instanceMethods.first;
         m4 = classB.instanceMethods[1];
       });
  
positive.code:   group('Constructor', () {
      var c2;
      setUp(() {
        c2 = library
            .classes
            .firstWhere((c) => c.name == 'Apple').constructors[0];
      });
  
      test('has contructor', () {
  
negative.code:       apple = library.classes.firstWhere((c) => c.name == 'Apple');
        b = library.classes.firstWhere((c) => c.name == 'B');
        implA = apple.implementors;
        implC = library.classes.firstWhere((c) => c.name == 'Cat').implementors;
      });
  
      test('the first class is Apple', () {
  