assertTrue(stackTrace.length > 0);

        // Verify the top of the stack trace is from this test class
        StackTraceElement topElement = stackTrace[0];
        assertEquals(this.getClass().getName(), topElement.getClassName());
    }

    public void test_nestedExceptions() {
        // Test nested exception handling
        Exception level3 = new RuntimeException("Level 3 error");

            // Log the exception for debugging purposes but don't fail the test
            System.out.println("Expected exception in test environment: " + t.getClass().getSimpleName() + ": " + t.getMessage());

            // Verify that it's a system-related exception, not a method signature issue

    runLatch.await();
    taskLatch.countDown();

    ExecutionException e = assertThrows(ExecutionException.class, () -> task.get(5, SECONDS));
    assertEquals(IllegalStateException.class, e.getCause().getClass());

    assertTrue(listenerLatch.await(5, SECONDS));
    assertTrue(task.isDone());
    assertFalse(task.isCancelled());
  }

  public void testListenerCalledOnCancelFromNotRunning() throws Exception {

        }
        throw new InvalidQueryException(messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY),
                "Unknown q: " + query.getClass() + " => " + query);
    }

    /**
     * Converts a wildcard query to an appropriate OpenSearch QueryBuilder.
     *
     * @param context The query context containing field and search information

     * @param authenticator The SSO authenticator to register
     */
    public void register(final SsoAuthenticator authenticator) {
        if (logger.isInfoEnabled()) {
            logger.info("Load {}", authenticator.getClass().getSimpleName());
        }
        authenticatorList.add(authenticator);
    }

     * internally stored data.
     */
    private static Object getPrivateField(Object target, String name) {
        try {
            java.lang.reflect.Field f = target.getClass().getDeclaredField(name);
            f.setAccessible(true);
            return f.get(target);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

            assertEquals(NbtException.FMT_ERR, ((NbtException) e).errorCode);
        } catch (Exception e) {
            fail("Should have caught CIFSException, but caught " + e.getClass().getSimpleName());
        }
    }

    // Helper method to invoke protected method using reflection
    private ClassificationMeta invokeMethod(Object obj, String methodName, String param) {
        try {
            java.lang.reflect.Method method = obj.getClass().getDeclaredMethod(methodName, String.class);
            method.setAccessible(true);
            return (ClassificationMeta) method.invoke(obj, param);
        } catch (Exception e) {

    ListenableFuture<String> chain = buildChainingFuture(badInput);
    ExecutionException e = assertThrows(ExecutionException.class, () -> chain.get());
    assertSame(RuntimeException.class, e.getCause().getClass());
  }

  /** Proxy to throw a {@link RuntimeException} out of the {@link #get()} method. */
  public static class BadFuture extends SimpleForwardingListenableFuture<Integer> {

    ListenableFuture<String> chain = buildChainingFuture(badInput);
    ExecutionException e = assertThrows(ExecutionException.class, () -> chain.get());
    assertSame(RuntimeException.class, e.getCause().getClass());
  }

  /** Proxy to throw a {@link RuntimeException} out of the {@link #get()} method. */
  public static class BadFuture extends SimpleForwardingListenableFuture<Integer> {