assertTrue(multimap.containsKey("bar"));
    assertEquals(singleton(2), multimap.removeAll("bar"));
    assertEquals(2, multimap.size());
    assertFalse(multimap.containsKey("bar"));
  }

  public void testForMapAsMap() {
    Map<String, Integer> map = new HashMap<>();
    map.put("foo", 1);
    map.put("bar", 2);
    Map<String, Collection<Integer>> asMap = Multimaps.forMap(map).asMap();