assertTrue(cache.asMap().keySet().contains(20));
    assertTrue(cache.asMap().keySet().contains(5));
    assertFalse(cache.asMap().keySet().contains(10));
  }

  public void testAsMapEntrySet() {
    Cache<Integer, Integer> cache =
        CacheBuilder.newBuilder().expireAfterWrite(1000, MILLISECONDS).ticker(fakeTicker).build();

    cache.put(10, 20);
    fakeTicker.advance(500, MILLISECONDS);