public void GetAlbumsForArtist_ShouldReturnContent() { _service.Setup(x => x.FindAlbumsByArtistId(1)) .Returns(new List <AlbumModel> { }); ActionResult <IEnumerable <AlbumDto> > action = _sut.GetAlbumsForArtist(1); Assert.That(action, Is.Not.Null); }