assertThat(cache.asMap().keySet().contains(20)).isTrue();
    assertThat(cache.asMap().keySet().contains(5)).isTrue();
    assertThat(cache.asMap().keySet().contains(10)).isFalse();
  }

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

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