public async Task UpdatePlaylistShouldUpdatePlaylist()
        {
            var list = new PlayList {
                Id = 1
            };

            _mixBLMock.Setup(x => x.UpdatePlayListAsync(It.IsAny <PlayList>())).Returns(Task.FromResult(list));
            var playController = new PlayListController(_mixBLMock.Object);
            var result         = await playController.UpdatePlayListAsync(list.Id, list);

            Assert.IsAssignableFrom <NoContentResult>(result);
            _mixBLMock.Verify(x => x.UpdatePlayListAsync(list));
        }