Test for p:insert 017 (AB)

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error"
                xmlns:p="http://www.w3.org/ns/xproc"
                xmlns:t="http://xproc.org/ns/testsuite/3.0" version="3.0">
   <p:output port="result"/>
   <p:insert match="/doc/text()" position="first-child">
      <p:with-input>
         <doc>This is text.</doc>
      </p:with-input>
      <p:with-input port="insertion">
         <doc2/>
      </p:with-input>
   </p:insert>
   <p:wrap-sequence wrapper="wrap"/>
</p:declare-step>