public async Task GetLikedAlbumIdsByUserIdAsyncTest_UserIdNoLikedArtists_EmptyArray() { // Arrange var albumRepoMock = new Mock <IAlbumRepository>(); albumRepoMock.Setup(mock => mock.GetLikedAlbumIdsByUserIdAsync(1)) .ReturnsAsync(new int[] { }) .Verifiable(); var albumCollection = new AlbumCollection(albumRepoMock.Object, _dependencyMapper); // Act var likedAlbums = (await albumCollection.GetLikedAlbumIdsByUserIdAsync(1)).ToArray(); // Assert albumRepoMock.Verify(); Assert.AreEqual(0, likedAlbums.Length); }