Collection<E> expected, Collection<E> actual) {
    assertIteratorsInOrder(expected.iterator(), actual.iterator());
  }

  private static <K extends @Nullable Object, V extends @Nullable Object>
      void assertMultimapRemainsUnmodified(Multimap<K, V> expected, List<Entry<K, V>> actual) {
    assertIteratorsInOrder(expected.entries().iterator(), actual.iterator());
  }

  /**