ImmutableListMultimap<String, Integer> multimap = ImmutableListMultimap.copyOf(input);
    new EqualsTester().addEqualityGroup(input, multimap).testEquals();
  }

  public void testCopyOfImmutableListMultimap() {
    Multimap<String, Integer> multimap = createMultimap();
    assertSame(multimap, ImmutableListMultimap.copyOf(multimap));
  }

  public void testCopyOfNullKey() {