public void TestAllTracks()
{
var options = new DbContextOptionsBuilder <MusicSpotDbContext>().UseInMemoryDatabase("returnTrackNotNull").Options;
var dbContext = new MusicSpotDbContext(options);
var service = new TrackService(dbContext);
var track = new Track
{
Name = "Joni",
Duration = "4:44",
AlbumId = 4
};
dbContext.Tracks.Add(track);
dbContext.SaveChanges();
var result = service.AllTracks(4);
Assert.That(result, Is.Not.Null);
Assert.AreNotEqual("aaaaaa", result.Result.UserId);
}