@Test
public void testSubtract() {

    final Vector3f retval = new Vector3f(12.0f, 8.0f, 5.0f).subtract(new Vector3f(7.0f, 4.0f, -2.0f));
    assertNotNull(retval);
    assertEquals(5.0f, retval.x, 0.0f);
    assertEquals(4.0f, retval.y, 0.0f);
    assertEquals(7.0f, retval.z, 0.0f);
}