public void Contains()
{
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.Contains(now));
Assert.IsTrue(intervals.Contains(now.AddMinutes(10)));
Assert.IsFalse(intervals.Contains(now.AddMinutes(-10)));
Assert.IsFalse(intervals.Contains(now.AddDays(5)));
Assert.IsFalse(intervals.Contains(now.AddDays(11)));
}