anchor.diff:  final incompatibleAPIVersion = '{"major": 5, "minor": 0}';
   final authorization = '{"username": "test-user", "token": "0xDEADBEEF", "is_admin": false}';
   
  +final rootDirectoryName = 'root';
  +final heronDirectoryName = 'Heron';
  +final aegeusDirectoryName = 'Aegeus';
  +final rootDirectoryPath = rootDirectoryName;
  +final heronDirectoryPath = rootDirectoryName + '/' + heronDirectoryName;
  +final aegeusDirectoryPath = heronDirectoryPath + '/' + aegeusDirectoryName;
  +
   class Mock extends mockito.Mock implements http.Client {
     Mock() {
       // API version
  
positive.code:     when(this.get(argThat(startsWith(goodHostURL + browseEndpoint)), headers: anyNamed('headers')))
          .thenAnswer((Invocation invocation) async {
        final String endpoint = invocation.positionalArguments[0];
        final String path = endpoint.substring((goodHostURL + browseEndpoint).length);
        final List<CollectionFile> files = _browseData[path];
        if (files == null) {
          return http.Response('', 404);
  
negative.code: Map<String, List<CollectionFile>> _browseData = {
    '': [
      CollectionFile(Right(
        Directory()..path = rootDirectoryPath,
      ))
    ],
    rootDirectoryPath: [
      CollectionFile(Right(
        Directory()..path = heronDirectoryPath,
      ))
    ],
    heronDirectoryPath: [
      CollectionFile(Right(
        Directory()
          ..path = aegeusDirectoryPath
          ..album = 'Aegeus'
          ..artist = 'Heron'
          ..year = 2016,
      ))
    ],
  };
  