map.put("quux", "quux");
    assertFalse(map.values() instanceof Set);
    assertTrue(map.values().removeAll(ImmutableSet.of("bar")));
    assertEquals(1, map.size());
  }

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