@Test
 public void testDuplicates() {
   SpatialKeyHashtableOld store = new SpatialKeyHashtableOld().init();
   assertEquals(0, store.put(12, 21, 123));
   assertEquals(1, store.size());
   assertEquals("location should already exist", 123, store.put(12, 21, 321));
   assertEquals(1, store.size());
 }
  @Test
  public void testAdd() {
    SpatialKeyHashtableOld store = new SpatialKeyHashtableOld().init();
    assertEquals(0, store.put(12, 21, 123));
    assertEquals(123, store.get(12, 21));
    assertEquals(1, store.size());

    assertEquals(0, store.put(12, 21.0001f, 321));
    assertEquals(321, store.get(12, 21.0001f));
    assertEquals(2, store.size());
  }