public void Intersections()
{
var now = DateTime.UtcNow;
var intervals = new IntervalCollection();
intervals.Add(new Interval(now, TimeSpan.FromHours(1)));
intervals.Add(new Interval(now.AddDays(10), TimeSpan.FromHours(1)));
Assert.IsTrue(intervals.GetIntersections().Count() == 0);
intervals.Clear();
intervals.Add(new Interval(now, TimeSpan.FromHours(2)));
intervals.Add(new Interval(now.AddHours(-0.5), TimeSpan.FromHours(1)));
var intersection = intervals.GetIntersections().Single();
Assert.AreEqual(now, intersection.Start);
Assert.AreEqual(TimeSpan.FromHours(0.5), intersection.Length);
}