map.put("quux", "quux");
    assertThat(map.values() instanceof Set).isFalse();
    assertThat(map.values().removeAll(ImmutableSet.of("bar"))).isTrue();
    assertThat(map).hasSize(1);
  }

  public void testCopyEntry_computing() {
    CountDownLatch startSignal = new CountDownLatch(1);
    CountDownLatch computingSignal = new CountDownLatch(1);
    CountDownLatch doneSignal = new CountDownLatch(2);
    Object computedObject = new Object();

    cache.put("a", "b");
    cache.asMap().computeIfAbsent("a", k -> "c");
    assertThat(notifications).isEmpty();
  }

  public void testCopyEntry_computing() {
    CountDownLatch startSignal = new CountDownLatch(1);
    CountDownLatch computingSignal = new CountDownLatch(1);
    CountDownLatch doneSignal = new CountDownLatch(2);
    Object computedObject = new Object();