assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

    public void test_stackTraceWithCause() {
        // Test that stack trace is properly preserved with cause
        String innerMessage = "Inner exception";
        String outerMessage = "Outer exception";

        assertEquals("test_stackTrace", firstElement.getMethodName());
    }

    /**
     * Test stack trace with cause
     */
    public void test_stackTraceWithCause() {
        Exception cause = new IllegalArgumentException("Cause exception");
        CrawlerSystemException exception = new CrawlerSystemException("Main exception", cause);