@Test
public void testNegate() {

    final Vector3f target = new Vector3f(-1.0f, 2.0f, -0.0f);
    final Vector3f retval = target.negate();
    assertNotNull(retval);
    assertEquals(1.0f, retval.x, 0.0f);
    assertEquals(-2.0f, retval.y, 0.0f);
    assertEquals(0.0f, retval.z, 0.0f);
    final Vector3f retval2 = retval.negate();
    assertEquals(retval2, target);
}