public async Task GetCinemaAsync_ById_NullResult() { // Arrange var fixture = new Fixture(); var cinemaRepoMock = new Mock <ICinemaRepository>(); cinemaRepoMock .Setup((r) => r.FindByIdAsync(It.IsAny <int>())); var uowMock = new Mock <IUnitOfWork>(); uowMock .Setup(x => x.Cinemas) .Returns(cinemaRepoMock.Object); var cinemaService = new CinemaService(uowMock.Object); var cinemaId = fixture.Create <int>(); // Act var cinema = await cinemaService.GetByIdAsync(cinemaId); // Assert Assert.Null(cinema); }