assertEquals(elements, multimap.entries());
        }
      }.test();
    }
  }

  @GwtIncompatible // unreasonably slow
  public void testKeysIteration() {
    new IteratorTester<String>(
        6,
        MODIFIABLE,
        newArrayList("foo", "foo", "bar", "bar", "foo"),
        IteratorTester.KnownOrder.KNOWN_ORDER) {