RequestData child2 = new RequestData();
        child2.setMethod(Method.GET);
        child2.setUrl("https://example.com/page2");

        // Add child URLs
        data.addChildUrl(child1);
        data.addChildUrl(child2);

        Set<RequestData> childUrlSet = data.getChildUrlSet();
        assertEquals(2, childUrlSet.size());
        assertTrue(childUrlSet.contains(child1));

        RequestData child1 = new RequestData();
        child1.setUrl("https://example.com/child1");
        responseData.addChildUrl(child1);

        RequestData child2 = new RequestData();
        child2.setUrl("https://example.com/child2");
        responseData.addChildUrl(child2);

        // Execute - should not throw any exception
        processor.process(responseData);

        return metaDataMap;
    }

    /**
     * Adds a child URL discovered from this response.
     *
     * @param url the child URL to add
     */
    public void addChildUrl(final RequestData url) {
        childUrlSet.add(url);
    }

    /**
     * Removes a child URL from this response.
     *
     * @param url the child URL to remove
     */