public void TestEmptyRangesTouches()
{
var r1 = IntRange.FromEndpoints(3, 4);
var r2 = IntRange.FromEndpoints(2, 2);
Assert.IsFalse(r1.Intersects(r2));
Assert.IsFalse(r2.Intersects(r1));
Assert.IsTrue(r2.Touches(r1));
Assert.IsTrue(r1.Touches(r2));
}