public async Task GetLikedSongIdsByUserIdAsyncTest_UserIdNoLikedSongs_EmptyArray()
{
// Arrange
var songRepoMock = new Mock <ISongRepository>();
songRepoMock.Setup(mock => mock.GetLikedSongIdsByUserIdAsync(1))
.ReturnsAsync(new int[] { })
.Verifiable();
var songCollection = new SongCollection(songRepoMock.Object, _dependencyMapper);
// Act
var likedSongs = (await songCollection.GetLikedSongIdsByUserIdAsync(1)).ToArray();
// Assert
songRepoMock.Verify();
Assert.AreEqual(0, likedSongs.Length);
}