cache.invalidate(0);
    assertThat(cache.get(0, loader)).isEqualTo(3);

    cache.put(0, 10);
    cache.invalidateAll();
    assertThat(cache.get(0, loader)).isEqualTo(4);
  }

  @Test
  public void sizeConstraint() {
    Cache<Integer, Integer> cache = CacheBuilder.newBuilder().maximumSize(4).build();

    cache.put(1, 10);
    cache.put(2, 20);
    cache.put(3, 30);
    cache.put(4, 40);
    cache.put(5, 50);