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));
}