public void SumTest() { for (var x = -10; x < 10; x++) { for (var y = -10; y < 10; y++) { for (var z = -10; z < 10; z++) { for (var w = -10; w < 10; w++) { var v = new Vector4(x, y, z, w); Assert.AreEqual(x + y + z + w, v.Sum()); } } } } }