public void Equals_FalseForNotEqual()
        {
            var a = new LineSegment3(new Vector3(1, 2, 3), new Vector3(4, 5, 6));
            var b = new LineSegment3(new Vector3(6, 5, 4), new Vector3(3, 2, 1));

            Assert.IsFalse(a.Equals(b));
            Assert.IsFalse(a.Equals((object)b));
            Assert.IsFalse(a == b);
        }
        public void Equals_TrueForEqual()
        {
            var a = new LineSegment3(new Vector3(1, 2, 3), new Vector3(4, 5, 6));
            var b = a;

            Assert.IsTrue(a.Equals(b));
            Assert.IsTrue(a.Equals((object)b));
            Assert.IsTrue(a == b);
        }