for (Entry<String, Integer> entry : expectedEntries) {
      multimap.put(entry.getKey(), entry.getValue());
    }
    List<String> actualKeys = new ArrayList<>();
    multimap.keys().spliterator().forEachRemaining(actualKeys::add);
    assertThat(actualKeys)
        .containsExactlyElementsIn(Lists.transform(expectedEntries, Entry::getKey))
        .inOrder();
  }

  public void testEntriesSpliterator() {