assertNotNull(nestedCause);
        assertEquals(innerCause, nestedCause);
        assertEquals("Invalid parameter", nestedCause.getMessage());
    }

    @Test
    public void test_messageWithSpecialCharacters() {
        // Test message with special characters
        String message = "Theme error: 日本語 & special <characters> \"quoted\" 'text'";
        ThemeException exception = new ThemeException(message);

        assertNotNull(exception.getCause().getCause());
        assertEquals("Root problem", exception.getCause().getCause().getMessage());
    }

    @Test
    public void test_messageWithSpecialCharacters() {
        // Test constructor with message containing special characters
        String message = "GSA error: config file not found at /path/to/config.xml\n" + "Details: \"file\" does not exist\t[TAB]\r\n"