StackTraceElement[] stackTrace = result.getStackTrace();
        assertNotNull(stackTrace);
        assertTrue(stackTrace.length > 0);
    }

    public void test_printStackTrace() {
        // Test printStackTrace doesn't throw exception
        DictionaryExpiredException exception = new DictionaryExpiredException();

        try {

        // Stack traces should be different
        assertNotSame(mainStackTrace, causeStackTrace);
    }

    /**
     * Test printStackTrace functionality
     */
    public void test_printStackTrace() {
        CrawlerSystemException exception = new CrawlerSystemException("Print stack trace test");

        StringWriter stringWriter = new StringWriter();