[xsl] XSL 3 function returning attributes sequence, and XSpec question

["cmarchand@xxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hello ! 

I need to generate one or two attributes, based on a string value, and I
need to use this code many times. So I've written a function : 

<xsl:function name="local:extractName" as="attribute()*">
  <xsl:param name="name" as="xs:string"/>
  <xsl:choose>
    <xsl:when test="$name castable as xs:QName">
      <xsl:variable name="qname" select="xs:QName($name)"
as="xs:QName"/>
      <xsl:sequence>
        <xsl:attribute name="name"
select="local-name-from-QName($qname)"/>
        <xsl:attribute name="namespace"
select="namespace-uri-from-QName($qname)"/>
      </xsl:sequence>
    </xsl:when>
    <xsl:otherwise>
      <xsl:sequence>
        <xsl:attribute name="name" select="$name"/>
      </xsl:sequence>
    </xsl:otherwise>
  </xsl:choose>
</xsl:function> 

This function still contains bugs, but for the described problem, it's
enough. 

I call this function in a template : 

<xsl:copy-of select="local:extractName(@name)"/> 

And this works perfectly. 

Now, I want to write a unit test for this function. I first want to
check that it returns a sequence of 2 attributes : 

<x:scenario label="Scenario for testing extractName function">
  <x:call function="local:extractName">
    <x:param name="name" as="xs:string" select="'toto'"/>
  </x:call>
  <!--x:expect label="two attributes, @name and @namespace"
select="exists(/*/@name) and exists(/*/@namespace)"/-->
  <x:expect label="two attributes, @name and @namespace"
select="count($x:result/*) ge 2"/>
</x:scenario> 

I've tried many things, but I can't have a successful test. Any idea of
how to test this ? 

If someone want to get the whole project :
https://github.com/cmarchand/xsl-doc The xspec is in src/test/xspec/,
and works under Oxygen 15.2 to 17. The maven build will be much more
complicated to run, as dependencies are not in central repository. 

Thanks in advance, 

Christophe