public void IntersectTest()
{
var a1 = new Point(0, 0);
var a2 = new Point(1, 0);
var b1 = new Point(1, 1);
var b2 = new Point(2, 1);
Assert.IsFalse(LineSegment.AreLineSegmentsIntersecting(a1, a2, b1, b2));
b2 = new Point(0, 0);
Assert.IsTrue(LineSegment.AreLineSegmentsIntersecting(a1, a2, b1, b2));
b2 = new Point(-1, 0);
Assert.IsFalse(LineSegment.AreLineSegmentsIntersecting(a1, a2, b1, b2));
}