assertEquals("Level 2", level2.getMessage());
        assertEquals("Level 3 - Root cause", level3.getMessage());
    }

    /**
     * Test serialization
     */
    public void test_serialization() throws Exception {
        String message = "Serialization test";
        Exception cause = new IOException("IO cause");
        CrawlerSystemException original = new CrawlerSystemException(message, cause);

        // Test null ResponseData
        assertFalse(conditionalRule.match(null));
    }

    /**
     * Test serialization of AbstractRule
     */
    public void test_serialization() throws Exception {
        TestResponseProcessor processor = new TestResponseProcessor();
        testRule.setRuleId("serializeRule");
        testRule.setResponseProcessor(processor);

        responseData4.setHttpStatusCode(404);
        assertFalse(rule.match(responseData4));
    }

    /**
     * Test Rule serialization
     */
    public void test_serialization() throws Exception {
        TestResponseProcessor processor = new TestResponseProcessor("serializeProcessor");
        TestRule originalRule = new TestRule("serializeRule", processor, true);

        // Serialize