x:label affects attribute(test) evaluation on XQuery

[AirQuick]

x:label affects not only the expectation (#308) but also @test on XQuery.

Put this .xspec file in [XSpec]/test/:

<?xml version="1.0" encoding="UTF-8"?>
<x:description query="x-urn:test:do-nothing" query-at="do-nothing.xquery"
	stylesheet="do-nothing.xsl" xmlns:do-nothing="x-urn:test:do-nothing"
	xmlns:x="http://www.jenitennison.com/xslt/xspec">

	<x:scenario label="When x:call returns a non-empty item">
		<x:call function="exactly-one">
			<x:param select="123" />
		</x:call>
		<x:expect test="exists($x:result)">
			<x:label>//x:expect[@test eq 'exists($x:result)'][empty(attribute() except
				@test)][x:label][empty(node() except (x:label | text()[not(normalize-space())]))]
				should be Success</x:label>
		</x:expect>
	</x:scenario>
</x:description>

Running XSpec -t with it passes:

passed: 1 / pending: 0 / failed: 0 / total: 1

Running -q fails:

passed: 0 / pending: 0 / failed: 1 / total: 1