assertNotNull(deserializedRule.getResponseProcessor());

        // Note: crawlerContainer is transient (marked with @Resource)
        // so it won't be serialized
        assertNull(deserializedRule.crawlerContainer);
    }

    /**
     * Test with null CrawlerContainer
     */
    public void test_nullCrawlerContainer() {

    public void test_serialization() throws Exception {
        // Test each enum value
        CrawlerStatus[] statuses = CrawlerStatus.values();

        for (CrawlerStatus original : statuses) {
            // Serialize
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(original);
            oos.close();

        String message = "Serialization test";
        Exception cause = new IOException("IO cause");
        CrawlerSystemException original = new CrawlerSystemException(message, cause);

        // Serialize
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(original);
        oos.close();

        // Deserialize

        TestResponseProcessor processor = new TestResponseProcessor("serializeProcessor");
        TestRule originalRule = new TestRule("serializeRule", processor, true);

        // Serialize
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(originalRule);
        oos.close();

        // Deserialize

        TestAccessResultData<String> original = new TestAccessResultData<>("test data".getBytes());
        original.setUrl("http://example.com");

        // Serialize
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(original);
        oos.close();

        // Deserialize