anchor.diff:    }
   }
   
  -class MockFuchsiaSdk extends Mock implements FuchsiaSdk {
  -  @override
  -  final FuchsiaPM fuchsiaPM = MockFuchsiaPM();
  +class FakeFuchsiaSdk extends Fake implements FuchsiaSdk {
  +  @override
  +  final FuchsiaPM fuchsiaPM = FakeFuchsiaPM();
   
     @override
     final FuchsiaKernelCompiler fuchsiaKernelCompiler =
  -      MockFuchsiaKernelCompiler();
  -}
  +      FakeFuchsiaKernelCompiler();
  +}
  
positive.code:   }
  }
  
  class MockFuchsiaKernelCompiler extends Mock implements FuchsiaKernelCompiler {
    @override
    Future<void> build({
      @required FuchsiaProject fuchsiaProject,
  
negative.code:       'FLUTTER_ROOT': '/'
      },
    );
    FakeFuchsiaSdk fuchsiaSdk;
  
    setUp(() {
      fuchsiaSdk = FakeFuchsiaSdk();
      fileSystem = MemoryFileSystem.test();
    });
  
  