text: const existsMock = jest.fn();
  existsMock.mockReturnValueOnce({then: jest.fn()});
  
  export default {
      DocumentDir: () => {},
      ImageCache: {
          get: {
              clear: () => {},
          },
      },
      fs: {
          exists: existsMock,
          dirs: {
              MainBundleDir: () => '',
              CacheDir: () => '',
              DocumentDir: () => '',
              DownloadDir: () => ''
          },
      },
  };