public void ToggleLikeWhenRemovingMovieFromPreferencesTest()
 {
     viewModel = new MovieDetailViewModel(movie, preferences);
     preferences.AddPreference(movie);
     viewModel.ToggleLike(movie);
     Assert.AreEqual("before_like.png", viewModel.MovieLikeButtonImageSource);
 }
 public void ToggleLikeMovieNotInPreferencesTest()
 {
     viewModel = new MovieDetailViewModel(movie, preferences);
     viewModel.ToggleLike(movie);
     Assert.AreEqual("after_like.png", viewModel.MovieLikeButtonImageSource);
 }