public void NextIntervalTests(RollingInterval interval, DateTime instant, DateTime?currentCheckpoint, DateTime?nextCheckpoint)
{
var current = interval.GetCurrentCheckpoint(instant);
Assert.Equal(currentCheckpoint, current);
var next = interval.GetNextCheckpoint(instant);
Assert.Equal(nextCheckpoint, next);
}
public DateTime?GetNextCheckpoint(DateTime instant) => _interval.GetNextCheckpoint(instant);