assertTrue(CharUtil.isUrlChar('('));
        assertTrue(CharUtil.isUrlChar(')'));
        assertTrue(CharUtil.isUrlChar(','));
        assertTrue(CharUtil.isUrlChar(';'));
    }

    public void test_isUrlChar_notAllowed() {
        // Test characters that are not allowed
        assertFalse(CharUtil.isUrlChar(' ')); // space
        assertFalse(CharUtil.isUrlChar('\t')); // tab
        assertFalse(CharUtil.isUrlChar('\n')); // newline