Tests p:os-exec: result port is empty because of error
Test ab-os-exec-019.xml is expected to pass.
It requires the following features: mac/linux or os-exec.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:os-exec command="/bin/cat" args="i-do-no-exist.xxx" error-content-type="text/plain">
<p:with-input>
<p:empty/>
</p:with-input>
</p:os-exec>
<p:if test="count(collection())=0" collection="true">
<p:identity>
<p:with-input>
<correct-result/>
</p:with-input>
</p:identity>
</p:if>
</p:declare-step>
<s:schema xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
<s:pattern>
<s:rule context="/">
<s:assert test="correct-result">Port "result" is not empty.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
Changed test as consequence of step pr #541.
Tests for p:os-exec