@Test public void testScaleAdd() { final Vector4 vec1 = new Vector4(1, 1, 1, 1); final Vector4 vec2 = vec1.scaleAdd(2.0, new Vector4(1, 2, 3, 4), null); final Vector4 vec2B = vec1.scaleAdd(2.0, new Vector4(1, 2, 3, 4), new Vector4()); assertEquals(new Vector4(3.0, 4.0, 5.0, 6.0), vec2); assertEquals(new Vector4(3.0, 4.0, 5.0, 6.0), vec2B); vec1.scaleAddLocal(2.0, new Vector4(1, 2, 3, 4)); assertEquals(vec2, vec1); }