The test is testing for the vendor field being correctly recognized as - 'vendor' : 'Saxonica' - we are using SaxonHE in the eXist implementation of fn:transform, and the vendor string returned from Saxon matches; therefore we attempt to compile and run the stylesheet. Doing so,
the template used in this test:
<xsl:template name='main'>
<out><xsl:value-of select=""saxon:in-summer-time(xs:dateTime('2016-07-01T00:00:00'), 'Europe/London')""/></out>
</xsl:template>
causes an error when run using Saxon HE: QueryError(FOXT0003,err:FOXT0003 Errors were reported during stylesheet compilation.
Further digging suggests that saxon:in-summer-time is restricted to Saxon EE. Presumably therefore the test passes when run with a version of Saxon EE.
We suggest that the test be modified to use a function valid in all versions of Saxon.