assertEquals(Integer.valueOf(40), cache.getIfPresent(4));
    assertEquals(Integer.valueOf(50), cache.getIfPresent(5));
    assertEquals(null, cache.getIfPresent(2));
  }

  public void testLoadingCache() throws ExecutionException {
    CacheLoader<Integer, Integer> loader =
        new CacheLoader<Integer, Integer>() {
          int i = 0;

          @Override