threadFailure.compareAndSet(null, t);
  }

  /**
   * Extra checks that get done for all test cases.
   *
   * <p>Triggers test case failure if any thread assertions have failed, by rethrowing, in the test
   * harness thread, any exception recorded earlier by threadRecordFailure.
   *
   * <p>Triggers test case failure if interrupted status is set in the main thread.
   */
  @Override
  protected void tearDown() throws Exception {

    threadFailure.compareAndSet(null, t);
  }

  /**
   * Extra checks that get done for all test cases.
   *
   * <p>Triggers test case failure if any thread assertions have failed, by rethrowing, in the test
   * harness thread, any exception recorded earlier by threadRecordFailure.
   *
   * <p>Triggers test case failure if interrupted status is set in the main thread.
   */
  @Override
  protected void tearDown() throws Exception {

      waitingThread.interrupt();
    }

    future.set(RESULT);

    assertEquals(times > 0, (boolean) interruptReporter.get(20, SECONDS));
  }

  /**
   * Confirms that the test code triggers {@link InterruptedException} in a standard {@link Future}.
   */
  public void testMakeUninterruptible_plainFutureSanityCheck() throws Exception {
    SettableFuture<String> future = SettableFuture.create();

      waitingThread.interrupt();
    }

    future.set(RESULT);

    assertEquals(times > 0, (boolean) interruptReporter.get(20, SECONDS));
  }

  /**
   * Confirms that the test code triggers {@link InterruptedException} in a standard {@link Future}.
   */
  public void testMakeUninterruptible_plainFutureSanityCheck() throws Exception {
    SettableFuture<String> future = SettableFuture.create();

        for (final String[] call : testClient.addMappingCalls) {
            assertNotNull(call);
        }
        // The loadBulkData=true path triggers getResourcePath + ResourceUtil.isExist checks.
        // In test environment resource files don't exist, so insertBulkData won't be called,
        // but the overall flow should still succeed.

   * the warnings the {@link MoreExecutors#directExecutor} documentation.
   *
   * @param input the primary input {@code Future}
   * @param exceptionType the exception type that triggers use of {@code fallback}. The exception
   *     type is matched against the input's exception. "The input's exception" means the cause of

  public <T> void testVariableTypeTokenNotAllowed() {
    /*
     * We'd use assertThrows here, but that causes no exception to be thrown under Java 8,
     * presumably because the ThrowingRunnable lambda triggers some kind of bug in Java 8's
     * reflection implementation.
     */
    try {
      new TypeToken<T>() {};
      fail();
    } catch (IllegalStateException expected) {
      // Type variables aren't allowed.

  public <T> void testVariableTypeTokenNotAllowed() {
    /*
     * We'd use assertThrows here, but that causes no exception to be thrown under Java 8,
     * presumably because the ThrowingRunnable lambda triggers some kind of bug in Java 8's
     * reflection implementation.
     */
    try {
      new TypeToken<T>() {};
      fail();
    } catch (IllegalStateException expected) {
      // Type variables aren't allowed.

   * #finishToValueAndCloser(ValueAndCloserConsumer, Executor)}, or any other derivation method on
   * the original {@code ClosingFuture} instance.
   *
   * @param exceptionType the exception type that triggers use of {@code fallback}. The exception
   *     type is matched against this step's exception. "This step's exception" means the cause of
   *     the {@link ExecutionException} thrown by {@link Future#get()} on the {@link Future}

        assertEquals("Q3", request.getMessages().get(3).getContent());
    }

    @Test
    public void test_addHistoryWithBudget_singleLargeMessage_truncation() {
        // Single message larger than budget triggers truncation fallback
        final List<LlmMessage> history = new ArrayList<>();
        history.add(LlmMessage.user("A".repeat(500)));
        final LlmChatRequest request = new LlmChatRequest();