assertEquals("Top level error", exception.getMessage());
        assertEquals(middleCause, exception.getCause());
        assertEquals("Middle cause", exception.getCause().getMessage());
        assertEquals(rootCause, exception.getCause().getCause());
        assertEquals("Root cause", exception.getCause().getCause().getMessage());
    }

    @Test
    public void test_throwAndCatch() {

        assertEquals("Level 3", level3.getMessage());
        assertEquals(level2, level3.getCause());
        assertEquals("Level 2", level3.getCause().getMessage());
        assertEquals(level1, level3.getCause().getCause());
        assertEquals("Level 1", level3.getCause().getCause().getMessage());
    }

    @Test
    public void test_throwAndCatchException() {

        assertTrue(exception instanceof FessSystemException);
    }

    @Test
    public void test_constructorWithNullMessage() {
        // Test constructor with null message
        SearchQueryException exception = new SearchQueryException((String) null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());

        ThemeException exception = new ThemeException(message, cause);

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertEquals("Config file not found", exception.getCause().getMessage());
    }

    @Test
    public void test_constructorWithNullMessage() {
        // Test constructor with null message

        assertEquals("Top level error", exception.getMessage());
        assertEquals(intermediateCause, exception.getCause());
        assertEquals("Intermediate cause", exception.getCause().getMessage());
        assertEquals(rootCause, exception.getCause().getCause());
        assertEquals("Root cause", exception.getCause().getCause().getMessage());
    }

    @Test
    public void test_withLongMessage() {

    @Test
    public void test_getMessage_consistency() {
        // Test that getMessage returns consistent results
        String message = "Consistent message";
        JobNotFoundException exception = new JobNotFoundException(message);

        assertEquals(message, exception.getMessage());
        assertEquals(message, exception.getMessage()); // Call twice to verify consistency

        // Verify the complete chain
        assertEquals("Plugin failure", exception.getMessage());
        assertEquals(level1, exception.getCause());
        assertEquals("Runtime error", exception.getCause().getMessage());
        assertEquals(level2, exception.getCause().getCause());
        assertEquals("Invalid state", exception.getCause().getCause().getMessage());
        assertEquals(level3, exception.getCause().getCause().getCause());

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertNotNull(exception.getCause());
        assertEquals(cause, exception.getCause());
        assertEquals("Underlying error", exception.getCause().getMessage());
    }

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message

        assertEquals(messageCode, exception3Params.getMessageCode());
        assertEquals(message, exception3Params.getMessage());
        assertEquals(cause, exception3Params.getCause());

        assertEquals(messageCode, exception2Params.getMessageCode());
        assertEquals(message, exception2Params.getMessage());
        assertNull(exception2Params.getCause());
    }

        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
    }

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message
        SearchEngineClientException exception = new SearchEngineClientException(null);

        assertNotNull(exception);
        assertNull(exception.getMessage());
        assertNull(exception.getCause());