@Test
  public void compareTo() {
    LatLng p1 = LatLng.newInstance(90, -180);
    LatLng p2 = LatLng.newInstance(-90, 180);
    LatLng p3 = LatLng.newInstance(90, -180);
    LatLng p4 = LatLng.newInstance(-90, -180);

    Assert.assertEquals(1, p1.compareTo(p2));
    Assert.assertEquals(-1, p2.compareTo(p1));

    Assert.assertEquals(0, p1.compareTo(p3));
    Assert.assertEquals(0, p3.compareTo(p1));

    Assert.assertEquals(1, p1.compareTo(p2));
    Assert.assertEquals(1, p2.compareTo(p4));
    Assert.assertEquals(1, p1.compareTo(p4));
  }