private static void CheckEndTime <TTimeSpan>(ITimeSpan time, ITimeSpan length, TTimeSpan expectedEndTime)
where TTimeSpan : ITimeSpan
{
var tempoMap = TempoMap.Default;
var note = new NoteMethods().Create(time, length, tempoMap);
TimeSpanTestUtilities.AreEqual(expectedEndTime, note.EndTimeAs <TTimeSpan>(tempoMap), "End time is invalid.");
}