anchor.diff:          String monoRepoContent, Object expectedTravisContent) async {
         await populateConfig(monoRepoContent);
   
  -      testGenerateTravisConfig();
  +      expect(
  +          testGenerateTravisConfig,
  +          prints(stringContainsInOrder([
  +            'package:sub_pkg',
  +            'Make sure to mark `./tool/travis.sh` as executable.'
  +          ])));
   
         await d.file(travisFileName, expectedTravisContent).validate();
         await d.file(travisShPath, _config2Shell).validate();
  
positive.code:       ''')
      ]).create();
  
      testGenerateTravisConfig();
      await d.file(travisFileName, r'''
  # Created with package:mono_repo v1.2.3
  language: dart
  
negative.code:       ''')
      ]).create();
  
      expect(
          testGenerateTravisConfig,
          prints(stringContainsInOrder([
            'package:sub_pkg',
            'Make sure to mark `./tool/travis.sh` as executable.'
          ])));
  
      await d.file(travisFileName, _config2Yaml).validate();
      await d.file(travisShPath, _config2Shell).validate();
  