}

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

  public void testCopyOfNullKey() {
    ArrayListMultimap<@Nullable String, Integer> input = ArrayListMultimap.create();
    input.put(null, 1);
    assertThrows(
        NullPointerException.class,