public void Test_GetAllMovies_handles_null()
        {
            // Arrange
            var mockRepo = new Mock <IMovieProvider>();

            mockRepo.Setup(repo => repo.GetAllMovies())
            .ReturnsAsync(ListClasses.GetMockNullValueMovies());

            var controller = new MovieController(mockRepo.Object);

            // Act
            var actual = controller.GetAllMovies();

            //Assert
            try
            {
                Assert.Throws <InvalidOperationException>(() => controller.GetAllMovies());
            }
            catch (AssertActualExpectedException exception)
            {
                Assert.Equal("(No exception was thrown)", exception.Actual);
            }
        }