* {@code get(null)}, {@code keySet().contains(null)} or {@code remove(null)}.
   */
  ALLOWS_NULL_KEY_QUERIES,
  ALLOWS_NULL_KEYS(ALLOWS_NULL_KEY_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code
   * containsValue(null)}, {@code values().contains(null)} or {@code values().remove(null)}.
   */
  ALLOWS_NULL_VALUE_QUERIES,
  ALLOWS_NULL_VALUES(ALLOWS_NULL_VALUE_QUERIES),

    assertThat(callbacks.remove()).isEqualTo(Event(null, "add", "73857293"))
    assertThat(callbacks.remove()).isEqualTo(Event(null, "remove", "2153"))
    assertThat(callbacks.remove()).isEqualTo(Event(null, "add", "113411"))
  }

  @Test
  fun commentsIgnored() {
    consumeEvents(
      """
      |: test stream
      |
      |data: first event
      |id: 1
      |
      |
      """.trimMargin(),
    )

        iterator.hasNext());
    iterator.remove();
    assertTrue(
        "multiset isn't empty after multiset.entrySet() iterator.remove()",
        getMultiset().isEmpty());
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removePresent() {
    assertTrue(
        "multiset.entrySet.remove(presentEntry) returned false",

      // values of these removes, but the cache should be empty after the removes, regardless.
      keys.remove(1);
      keys.remove(2);
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();

      // values of these removes, but the cache should be empty after the removes, regardless.
      keys.remove(1);
      keys.remove(2);
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();

    assertThrows(UnsupportedOperationException.class, () -> getMap().remove(k0()));
    expectUnchanged();
    assertEquals("remove(present) should not remove the element", v0(), get(k0()));
  }

  @MapFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemove_unsupportedNotPresent() {
    try {
      assertNull(
          "remove(notPresent) should return null or throw UnsupportedOperationException",

          }
        };

    EvictingQueue<String> queue = EvictingQueue.create(3);
    assertTrue(queue.addAll(misbehavingList));

    assertEquals("three", queue.remove());
    assertEquals("four", queue.remove());
    assertEquals("five", queue.remove());
    assertTrue(queue.isEmpty());
  }

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester
  public void testNullPointerExceptions() {

    }

    @Test
    @DisplayName("EmptyIterator should handle remove operations multiple times")
    void testMultipleRemoveOperations() {
        // When & Then
        assertDoesNotThrow(() -> {
            emptyIterator.remove();
            emptyIterator.remove();
            emptyIterator.remove();
        }, "Multiple remove operations should not cause issues");

        hasChanges |= trimParentElementLimited(context, root, parentElement);

        // Only remove parent elements if the parent is in the same reactor (not external)
        if (isParentInReactor(parentElement, pomMap, context)) {
            // Remove parent groupId if child has no explicit groupId
            if (childGroupId == null) {

        iterator.hasNext());
    iterator.remove();
    assertTrue(
        "multiset isn't empty after multiset.entrySet() iterator.remove()",
        getMultiset().isEmpty());
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_removePresent() {
    assertTrue(
        "multiset.entrySet.remove(presentEntry) returned false",