anchor.diff:  
     void setUp() {
       provider = new MemoryResourceProvider();
  -    File pubspecFile = provider.getFile('/sample/pubspec.yaml');
  +    File pubspecFile =
  +        provider.getFile(provider.convertPath('/sample/pubspec.yaml'));
       Source source = pubspecFile.createSource();
       validator = new PubspecValidator(provider, source);
     }
  
positive.code:   }
  
    test_assetFieldNotList_noError() {
      provider.newFile('/sample/assets/my_icon.png', '');
      assertNoErrors('''
  name: sample
  flutter:
  
negative.code:   }
  
    test_assetNotString_noError() {
      provider.newFile(provider.convertPath('/sample/assets/my_icon.png'), '');
      assertNoErrors('''
  name: sample
  flutter:
  