}

    public void test_escapeXml_basic() {
        // Test basic XML escaping
        assertEquals("&lt;tag&gt;value&lt;/tag&gt;", XmlUtil.escapeXml("<tag>value</tag>"));
    }

    public void test_escapeXml_allSpecialChars() {
        // Test all special characters
        String input = "Test & < > \"quote\" 'apos'";
        String expected = "Test &amp; &lt; &gt; &quot;quote&quot; &apos;apos&apos;";