String sessionId = "test_session_buffer";
        List<String> cmdList = Arrays.asList("echo", "hello world");
        Consumer<ProcessBuilder> pbCall = pb -> {
            pb.redirectErrorStream(true);
        };

        List<String> outputs = new ArrayList<>();
        Consumer<String> outputCallback = output -> outputs.add(output);

        try {

            fail("Should throw NullPointerException for null consumer");
        } catch (NullPointerException e) {
            // Expected behavior
        }
    }

    public void test_processThreadDump_multipleThreads() {
        AtomicInteger threadCount = new AtomicInteger(0);
        AtomicInteger stackTraceCount = new AtomicInteger(0);

        Consumer<String> countingConsumer = line -> {

    /**
     * Sets an attribute value from search results using a Consumer.
     *
     * @param result the list of search results
     * @param name the attribute name
     * @param consumer the Consumer to process the attribute value
     */
    protected void setAttributeValue(final List<SearchResult> result, final String name, final Consumer<Object> consumer) {
        final List<Object> attrList = getAttributeValueList(result, name);

    }

    /**
     * Processes thumbnail generation with a consumer function.
     * @param id The document ID.
     * @param consumer The consumer function to process thumbnail and config ID.
     * @return True if processing was successful, false otherwise.
     */
    protected boolean process(final String id, final BiPredicate<String, String> consumer) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

     *
     * @param src The source Bean. Must not be {@literal null}.
     * @param dest The destination Bean. Must not be {@literal null}.
     * @param option The consumer for copy options.
     */
    public static void copyBeanToBean(final Object src, final Object dest, final Consumer<CopyOptions> option) {
        copyBeanToBean(src, dest, buildCopyOptions(option));
    }

    /**
     * Copies properties from one Bean to another Bean.

        for (int dos : inputs) {
            int nt = findNtStatusOrMinusOne(dos);
            if (nt != -1) {
                consumer.accept(dos, nt);
            }
        }

        // Assert: consumer called exactly for the 3 known codes, with the right arguments
        ArgumentCaptor<Integer> dosCaptor = ArgumentCaptor.forClass(Integer.class);

    class MockCurlRequest extends CurlRequest {

        MockCurlRequest(Curl.Method method, String url) {
            super(method, url);
        }

        @Override
        public void connect(Consumer<HttpURLConnection> actionListener, Consumer<Exception> exceptionListener) {
            try {
                actionListener.accept(new MockHttpURLConnection(new URL(url)));
            } catch (MalformedURLException e) {

                }
            });
        }
    }

    /**
     * Adds function score configuration to the query builder.
     * @param functionScoreQuery Consumer that configures the function score filters.
     */
    public void addFunctionScore(final Consumer<List<FilterFunctionBuilder>> functionScoreQuery) {
        final List<FilterFunctionBuilder> list = new ArrayList<>();
        functionScoreQuery.accept(list);

        // Arrange: pick a value and a mocked consumer
        RequestParam rp = RequestParam.NO_RETRY;

        // Act: pass to the collaborator
        consumer.accept(rp);

        // Assert: interaction happened exactly once with correct argument; no other calls
        verify(consumer, times(1)).accept(RequestParam.NO_RETRY);
        verifyNoMoreInteractions(consumer);
    }

     *
     * @param builder a {@link Consumer} that accepts an {@link XPathFactory} and configures it.
     * @return a configured instance of {@link XPath}.
     * @throws CrawlerSystemException if an error occurs while creating the {@link XPath} instance.
     */
    public XPath createXPath(final Consumer<XPathFactory> builder) {
        try {