public void TestCase(int testIndex, string intervals1, string intervals2, string expectedIntervals)
{
IInterval <int> interval1 = GetIntervals(intervals1).First();
IInterval <int> interval2 = GetIntervals(intervals2).First();
IInterval <int> expected = GetIntervals(expectedIntervals).FirstOrDefault();
Assert.That(interval1.TryGetOverlappingInterval(interval2), Is.EqualTo(expected));
}