for (Thread t : threads) {
      t.join();
    }

    if (thrown.get() != null) {
      throw thrown.get();
    }
    assertEquals(1, count.get());
  }

  @J2ktIncompatible
  @GwtIncompatible // Thread
  @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
  public void testSynchronizedSupplierThreadSafe() throws InterruptedException {
    Supplier<Integer> nonThreadSafe =

    for (Thread t : threads) {
      t.join();
    }

    if (thrown.get() != null) {
      throw thrown.get();
    }
    assertEquals(1, count.get());
  }

  @J2ktIncompatible
  @GwtIncompatible // Thread
  @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
  public void testSynchronizedSupplierThreadSafe() throws InterruptedException {
    Supplier<Integer> nonThreadSafe =

   * it does.
   *
   * @throws IOException if an I/O error occurs while reading from this source or if {@code
   *     processor} throws an {@code IOException}
   * @since 16.0
   */
  @CanIgnoreReturnValue // some processors won't return a useful result
  @ParametricNullness
  public <T extends @Nullable Object> T readLines(LineProcessor<T> processor) throws IOException {
    checkNotNull(processor);

   * it does.
   *
   * @throws IOException if an I/O error occurs while reading from this source or if {@code
   *     processor} throws an {@code IOException}
   * @since 16.0
   */
  @CanIgnoreReturnValue // some processors won't return a useful result
  @ParametricNullness
  public <T extends @Nullable Object> T readLines(LineProcessor<T> processor) throws IOException {
    checkNotNull(processor);

    @Override
    protected int execute(MavenContext context) throws Exception {
        MavenExecutionRequest request = prepareMavenExecutionRequest();
        toolchains(context, request);
        populateRequest(context, context.lookup, request);
        return doExecute(context, request);
    }

    protected MavenExecutionRequest prepareMavenExecutionRequest() throws Exception {
        // explicitly fill in "defaults"?

        callListeners(session, AbstractMavenLifecycleParticipant::afterSessionEnd);
    }

    @FunctionalInterface
    interface ListenerMethod {
        void run(AbstractMavenLifecycleParticipant listener, MavenSession session) throws MavenExecutionException;
    }

    private void callListeners(MavenSession session, ListenerMethod method) throws MavenExecutionException {

      object : X509TrustManager {
        @Throws(CertificateException::class)
        override fun checkClientTrusted(
          chain: Array<X509Certificate>,
          authType: String,
        ) = throw CertificateException()

        override fun checkServerTrusted(
          chain: Array<X509Certificate>,
          authType: String,
        ) = throw AssertionError()

     * @throws IOException Model read problem
     */
    @Test
    void testFlatUrls() throws IOException {
        testInheritance("flat-urls");
    }

    /**
     * MNG-5951 MNG-6059 child.x.y.inherit.append.path="false" test
     * @throws Exception
     */
    @Test
    void testNoAppendUrls() throws Exception {
        testInheritance("no-append-urls");
    }

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    future = SettableFuture.create();
    tester = new ListenableFutureTester(future);
    tester.setUp();
  }

  public void testDefaultState() throws Exception {
    assertThrows(TimeoutException.class, () -> future.get(5, MILLISECONDS));
  }

  public void testSetValue() throws Exception {
    assertTrue(future.set("value"));

  // transition to DONE
  public void testInterruptThrows() throws Exception {
    CountDownLatch isInterruptibleRegistered = new CountDownLatch(1);
    SettableFuture<String> taskResult = SettableFuture.create();
    InterruptibleTask<String> task =
        new InterruptibleTask<String>() {
          @Override
          String runInterruptibly() throws Exception {
            BrokenChannel bc = new BrokenChannel();