String xmlOutput = DomUtils.toXml(doc);
        assertTrue(xmlOutput.contains("<pluginManagement>"), "Should contain pluginManagement element");
    }

    @Test
    void testInsertContentElement() throws Exception {
        String pomXml = """
            <?xml version="1.0" encoding="UTF-8"?>
            <project xmlns="http://maven.apache.org/POM/4.0.0">
                <modelVersion>4.0.0</modelVersion>