Allow any Confluence macro to provide a content

    public void testUnknownMacro() throws Exception
    {
        test(
            "{unknownmacro}a{unknownmacro}b",
            ""
                + "<pre class='wikimodel-macro' macroName='unknownmacro'><![CDATA[a]]></pre>\n"
                + "<p>b</p>");
    }