anchor.diff:          .writeAsString(_testLibPartContentNoClass);
   
       output = await generate(projectPath, [const CommentGenerator()],
  -        changeFilePaths: [partRelativeFilePath]);
  +        changeFilePaths: [partRelativeFilePath], omitGeneateTimestamp: true);
   
       expect(output, "Deleted: 'lib/test_lib.g.dart'");
   
  
positive.code:         d.file('test_lib.dart', _testLibContentNoClass),
          d.file('test_lib_part.dart', _testLibPartContentNoClass),
          d.nothing('test_lib.g.dart')
        ])
      ])
          .validate();
  
negative.code: final int bar = 42;
  ''';
  
  const _testOtherFileContent = r'''
  just using this for file size
  ''';
  
  const _testGenPartContent = r'''// GENERATED CODE - DO NOT MODIFY BY HAND
  
  part of test_lib;
  