@Test
public void testHashContains() {

    LatLong centre = decodeHash("dre7");
    assertTrue(GeoHash.hashContains("dre7", centre.getLat(),
            centre.getLon()));
    assertFalse(GeoHash.hashContains("dre7", centre.getLat() + 20,
            centre.getLon()));
    assertFalse(GeoHash.hashContains("dre7", centre.getLat(),
            centre.getLon() + 20));
}