public async Task GetByGenres()
{
IEnumerable <IGenreWithRadios> genres = await _radio.GetByGenres();
Assert.IsNotNull(genres, nameof(genres));
IRadio oneRadio = genres.First().Radios.First();
IEnumerable <ITrack> tracks = oneRadio.GetFirst40Tracks()
.GetAwaiter().GetResult();
Assert.AreEqual(40, tracks.Count(), "Count");
}