private M multimap;

  protected M multimap() {
    return multimap;
  }

  /**
   * @return an array of the proper size with {@code null} as the key of the middle element.
   */
  protected Entry<K, V>[] createArrayWithNullKey() {
    Entry<K, V>[] array = createSamplesArray();
    int nullKeyLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullKeyLocation];

    assertEquals("Should be able to peek() at middle element", "B", peekingIterator.peek());
    assertEquals(
        "Should be able to peek() middle element multiple times", "B", peekingIterator.peek());
    assertEquals(
        "next() should still return middle element after peeking", "B", peekingIterator.next());

                .named("Floats.asList, tail subList"),
            ListTestSuiteBuilder.using(new FloatsAsListMiddleSubListGenerator())
                .named("Floats.asList, middle subList"));

    TestSuite suite = new TestSuite();
    for (ListTestSuiteBuilder<Float> builder : builders) {
      suite.addTest(
          builder
              .withFeatures(
                  CollectionSize.ONE,

                .named("Longs.asList, tail subList"),
            ListTestSuiteBuilder.using(new LongsAsListMiddleSubListGenerator())
                .named("Longs.asList, middle subList"));

    TestSuite suite = new TestSuite();
    for (ListTestSuiteBuilder<Long> builder : builders) {
      suite.addTest(
          builder
              .withFeatures(
                  CollectionSize.ONE,

  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testAddAllAtIndex_middle() {
    assertTrue(
        "addAll(middle, disjoint) should return true",
        getList().addAll(getNumElements() / 2, createDisjointCollection()));
    expectAdded(getNumElements() / 2, createDisjointCollection());
  }

    for (V element : elements) {
      assertFalse("Should not contain value " + element, getMap().containsValue(element));
    }
  }

  /** @return an array of the proper size with {@code null} as the key of the middle element. */
  protected Entry<K, V>[] createArrayWithNullKey() {
    Entry<K, V>[] array = createSamplesArray();
    int nullKeyLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullKeyLocation];

            .createTestSuite());
    suite.addTest(
        ListTestSuiteBuilder.using(new ImmutableListMiddleSubListGenerator())
            .named("ImmutableList, middle subList")
            .withFeatures(CollectionSize.ANY, SERIALIZABLE, ALLOWS_NULL_QUERIES)
            .createTestSuite());
    suite.addTest(
        ListTestSuiteBuilder.using(new UnhashableElementsImmutableListGenerator())

                .named("Chars.asList, tail subList"),
            ListTestSuiteBuilder.using(new CharsAsListMiddleSubListGenerator())
                .named("Chars.asList, middle subList"));

    TestSuite suite = new TestSuite();
    for (ListTestSuiteBuilder<Character> builder : builders) {
      suite.addTest(
          builder
              .withFeatures(

                .named("Doubles.asList, tail subList"),
            ListTestSuiteBuilder.using(new DoublesAsListMiddleSubListGenerator())
                .named("Doubles.asList, middle subList"));

    TestSuite suite = new TestSuite();
    for (ListTestSuiteBuilder<Double> builder : builders) {
      suite.addTest(
          builder
              .withFeatures(
                  CollectionSize.ONE,

    // Test that listeners added both before and after the value is available
    // get called correctly.
    for (int i = 0; i < 20; i++) {

      // Right in the middle start up a thread to close the latch.
      if (i == 10) {
        new Thread(() -> latch.countDown()).start();
      }

      future.addListener(listenerLatch::countDown, exec);
    }