cache.put(10, 20);
    assertThat(cache.getIfPresent(10)).isEqualTo(20);

    fakeTicker.advance(500, MILLISECONDS);
    assertThat(cache.getIfPresent(10)).isNull();
  }

  @SuppressWarnings("ContainsEntryAfterGetInteger") // we are testing our implementation of Map.get
  @Test
  public void mapMethods() {
    Cache<Integer, Integer> cache = CacheBuilder.newBuilder().build();