@Test
public void testRandom() {

  MathUtils.setRandomSeed(0);
  final Ring ring1 = new Ring();
  final Vector3 store = ring1.random(null);
  assertEquals(new Vector3(0.7454530390475868, 0.0, -0.4186496466746111), store);
  ring1.setUp(Vector3.UNIT_X);
  ring1.random(store);
  assertEquals(new Vector3(0.0, 0.30386186434027496, -0.3849731927481824), store);
}