assertTrue("Heap is not intact after remove()", mmHeap.isIntact());
    values.removeAll(Lists.newArrayList(2));
    assertEquals(values.size(), mmHeap.size());
    assertTrue(values.containsAll(mmHeap));
    assertTrue(mmHeap.containsAll(values));
  }

  public void testIteratorInvalidatingIteratorRemove() {
    MinMaxPriorityQueue<Integer> mmHeap = MinMaxPriorityQueue.create();

  public void testRemoveAll_containsNullNo() {
    MinimalCollection<?> containsNull = MinimalCollection.of((Object) null);
    try {
      assertFalse(
          "removeAll(containsNull) should return false or throw",
          collection.removeAll(containsNull));
    } catch (NullPointerException tolerated) {
    }
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  public void testAddAllAtIndex_nullSupported() {
    List<E> containsNull = singletonList(null);
    assertTrue("addAll(n, containsNull) should return true", getList().addAll(0, containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */

  public void testRemoveAll_containsNullNo() {
    MinimalCollection<?> containsNull = MinimalCollection.of((Object) null);
    try {
      assertFalse(
          "removeAll(containsNull) should return false or throw",
          collection.removeAll(containsNull));
    } catch (NullPointerException tolerated) {
    }
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  public void testAddAllAtIndex_nullSupported() {
    List<E> containsNull = singletonList(null);
    assertTrue("addAll(n, containsNull) should return true", getList().addAll(0, containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */

      value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
      absent = RESTRICTS_ELEMENTS)
  public void testAddAll_nullSupported() {
    List<E> containsNull = singletonList(null);
    assertTrue("addAll(containsNull) should return true", collection.addAll(containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */

      value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
      absent = RESTRICTS_ELEMENTS)
  public void testAddAll_nullSupported() {
    List<E> containsNull = singletonList(null);
    assertTrue("addAll(containsNull) should return true", collection.addAll(containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */