anchor.diff:  class A {}
   class B {}
   ''');
  -    expect(helper.instantiatedClasses['A'], isNotNull);
  -    expect(helper.instantiatedClasses['B'], isNull);
  +    helper.assertHasInstantiatedClass('A');
  +    helper.assertNoInstantiatedClass('B');
     });
   
     test('Method invocation', () {
  
positive.code:   foo(new A());
  }
  ''');
      expect(helper.methods['A.m1'], isNotNull);
      expect(helper.methods['A.m2'], isNull);
    });
  
    test('Method invocation on dynamic via cascade', () {
  
negative.code:   foo(new A());
  }
  ''');
      helper.assertHasMethod('A.m1');
      helper.assertHasMethod('A.m2');
    });
  }
  
  