@Test
public void testSimpleHash() {

  // Just a simple sanity check.
  final Vector3 vec1 = new Vector3(1, 2, 3);
  final Vector3 vec2 = new Vector3(1, 2, 3);
  final Vector3 vec3 = new Vector3(2, 2, 2);
  assertTrue(vec1.hashCode() == vec2.hashCode());
  assertTrue(vec1.hashCode() != vec3.hashCode());
}