anchor.diff:    @override
     String get testFilePath => '$projectPath/lib/test.dart';
   
  -  void assertNoErrorsInCode() {
  -    var errors = <AnalysisError>[];
  -    driver.filesErrors.forEach((_, fileErrors) {
  -      errors.addAll(fileErrors);
  -    });
  -    expect(errors, isEmpty);
  -  }
  -
     Future<void> test_project_lib() async {
       await addProjectFile('lib/a.dart', r'''
   class A {}
  
positive.code:     expect(matches, hasLength(1));
      return matches.first;
    }
  }
  
  @reflectiveTest
  
negative.code:   ^
  }
  ''');
  
      expectSuggestion(
          completion: 'A',
  