assertThat(multimap.keySet()).containsExactly("bar", "cow").inOrder();
    assertTrue(multimap.remove("bar", 4));
    assertThat(multimap.keySet()).containsExactly("bar", "cow").inOrder();
    assertTrue(multimap.remove("bar", 1));
    assertThat(multimap.keySet()).contains("cow");
    multimap.put("bar", 9);
    assertThat(multimap.keySet()).containsExactly("cow", "bar").inOrder();
  }

     * been intended for something else, so don't clear it.
     */
    boolean restoreInterruptedBit = false;
    int spinCount = 0;
    // Interrupting Cow Says:
    //  ______
    // < Spin >
    //  ------
    //        \   ^__^
    //         \  (oo)\_______
    //            (__)\       )\/\
    //                ||----w |
    //                ||     ||

    filtered.put("chicken", 7);
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);

    assertThrows(IllegalArgumentException.class, () -> filtered.put("cow", 7));
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
  }

  public void testFilteredEntriesIllegalPutAll() {
    Map<String, Integer> unfiltered = createUnfiltered();

     * been intended for something else, so don't clear it.
     */
    boolean restoreInterruptedBit = false;
    int spinCount = 0;
    // Interrupting Cow Says:
    //  ______
    // < Spin >
    //  ------
    //        \   ^__^
    //         \  (oo)\_______
    //            (__)\       )\/\
    //                ||----w |
    //                ||     ||

    map.put("bar", 2);
    Map<String, Collection<Integer>> asMap = Multimaps.forMap(map).asMap();
    assertEquals(singleton(1), asMap.get("foo"));
    assertNull(asMap.get("cow"));
    assertTrue(asMap.containsKey("foo"));
    assertFalse(asMap.containsKey("cow"));

    Set<Entry<String, Collection<Integer>>> entries = asMap.entrySet();
    assertFalse(entries.contains((Object) 4.5));
    assertFalse(entries.remove((Object) 4.5));