}

    public void test_isUrlChar_brackets() {
        // Test brackets
        assertTrue(CharUtil.isUrlChar('['));
        assertTrue(CharUtil.isUrlChar(']'));
    }

    public void test_isUrlChar_otherAllowedChars() {
        // Test other allowed characters
        assertTrue(CharUtil.isUrlChar('@'));
        assertTrue(CharUtil.isUrlChar('~'));
        assertTrue(CharUtil.isUrlChar('!'));