public async Task AddPlayListShouldAddPlayList() { var playList = new PlayList(); _mixBLMock.Setup(x => x.AddPlayListAsync(It.IsAny <PlayList>())).Returns(Task.FromResult <PlayList>(playList)); var playlistController = new PlayListController(_mixBLMock.Object); var result = await playlistController.AddPlaylistAsync(new PlayList()); Assert.IsAssignableFrom <CreatedAtActionResult>(result); _mixBLMock.Verify(x => x.AddPlayListAsync((It.IsAny <PlayList>()))); }