assertTrue(cms.removeExactly("a", 2));
    assertEquals(0, cms.count("a"));
    assertTrue(cms.removeExactly("b", 2));
    assertEquals(1, cms.count("b"));
  }

  public void testIteratorRemove_actualMap() {
    // Override to avoid using mocks.
    multiset = ConcurrentHashMultiset.create();

    multiset.add(KEY);
    multiset.add(KEY + "_2");
    multiset.add(KEY);

    int mutations = 0;