* one or more such elements. Returns {@code true} if this queue contained the specified element
   * (or equivalently, if this queue changed as a result of the call).
   *
   * @param o element to be removed from this queue, if present
   * @return {@code true} if this queue changed as a result of the call
   */
  @CanIgnoreReturnValue
  @Override
  public boolean remove(@Nullable Object o) {

        // Wait for all reader threads to complete
        for (Thread thread : readerThreads) {
            thread.join(testDurationMs + 1000);
        }

        // Verify that alive was changed to false
        assertFalse("alive should be false after writer thread", dataStore.alive);

        // At least some observations from reader threads should have seen false
        // due to volatile ensuring visibility

      List<E> list, int index, Iterable<? extends E> elements) {
    boolean changed = false;
    ListIterator<E> listIterator = list.listIterator(index);
    for (E e : elements) {
      listIterator.add(e);
      changed = true;
    }
    return changed;
  }

  /** An implementation of {@link List#indexOf(Object)}. */

        // Create some objects to change memory usage
        @SuppressWarnings("unused")
        String[] largeArray = new String[1000];
        for (int i = 0; i < 1000; i++) {
            largeArray[i] = "test" + i;
        }

        long memory2 = MemoryUtil.getUsedMemory();
        assertTrue(memory2 >= 0);
        // Memory usage should have changed (though we can't guarantee direction due to GC)
    }

   * each given element has increased by one since the test collection was created, and the number
   * of occurrences of all other elements has not changed.
   *
   * <p>Note: This means that a test like the following will fail if {@code collection} is a {@code
   * Set}:
   *
   * <pre>
   * collection.add(existingElement);

        // Simulate failure
        IOException failure = new IOException("Connection lost");
        failover.handleFailure(channel, failure);

        // Verify channel state changed
        assertFalse(channel.isHealthy());
        assertEquals(ChannelState.FAILED, channel.getState());
    }

    @Test
    void testLoadBalancingStrategies() throws Exception {

   * Returns the node that is adjacent to {@code node} along the origin edge.
   *
   * @throws IllegalArgumentException if this {@link EndpointPair} does not contain {@code node}
   * @since 20.0 (but the argument type was changed from {@code Object} to {@code N} in 31.0)
   */
  public final N adjacentNode(N node) {
    if (node.equals(nodeU)) {
      return nodeV;
    } else if (node.equals(nodeV)) {
      return nodeU;
    } else {

   * {@link TypeVariableImpl#equals(Object)} is changed to no longer be equal to custom TypeVariable
   * implementations. As a result, we need to make sure our TypeVariable implementation respects
   * symmetry. Moreover, we don't want to reconstruct a native type variable {@code <A>} using our
   * implementation unless some of its bounds have changed in resolution. This avoids creating

   * of the chars.
   *
   * <p>Additionally, for mutable sources such as {@code StringBuilder}s, a subsequent read may
   * return a different number of chars if the contents are changed.
   *
   * @since 19.0
   */
  public Optional<Long> lengthIfKnown() {
    return Optional.absent();
  }

  /**

   * one or more such elements. Returns {@code true} if and only if this queue contained the
   * specified element (or equivalently, if this queue changed as a result of the call).
   *
   * @param o element to be removed from this queue, if present
   * @return {@code true} if this queue changed as a result of the call
   */
  @CanIgnoreReturnValue // pushed down from class to method
  @Override