assertTrue(cache.asMap().containsKey(key));
    }
    assertSame(extraValue, cache.asMap().get(extraKey));
    assertFalse(cache.asMap().containsKey(extraValue));
  }

  public void testBulkLoad_clobberNullKey() throws ExecutionException {
    final Object extraKey = new Object();
    final Object extraValue = new Object();
    CacheLoader<Object, Object> loader =
        new CacheLoader<Object, Object>() {