public async Task GetByGenreAsyncTest() { _moviesRepositoryMock .Setup(x => x.GetByGenreAsync(It.IsAny <MovieGenre>())) .ReturnsAsync((MovieGenre x) => new List <Movie>().AsEnumerable()) .Verifiable(); var result = await _service.GetByGenreAsync(MovieGenre.Action); _moviesRepositoryMock.VerifyAll(); }