public void AddToCurrent() { //arrange Vector3 v1 = (1.0, 2.0, 3.0); Vector3 v2 = (0.0, -2.0, 4.0); //act v1.AddToCurrent(v2); //assert Assert.AreEqual(1.0, v1.X); Assert.AreEqual(0.0, v1.Y); Assert.AreEqual(7.0, v1.Z); }