}

  public void testRemove_nonePresent() {
    when(backingMap.get(KEY)).thenReturn(null);

    assertEquals(0, multiset.remove(KEY, 400));
  }

  public void testRemove_someRemaining() {
    int countToRemove = 30;
    int countRemaining = 1;
    AtomicInteger current = new AtomicInteger(countToRemove + countRemaining);

    when(backingMap.get(KEY)).thenReturn(current);