assertEquals("User: John, Age: 30", result);
    }

    // Test evaluate method with special characters in template
    @Test
    public void test_evaluate_withSpecialCharacters() {
        String template = "Price: $${price} (with ${discount}% off)";
        Map<String, Object> paramMap = new HashMap<>();
        paramMap.put("price", "100");
        paramMap.put("discount", "20");