XSpec is not available from Google Code anymore. I saw that you discussed this in the other active pull request. The commit I use is the one you linked to in one of your comments.
I updated Saxon HE to version 9.7.0-14 because I had problems with the plugin when I built with version 9.7.0-1. The first test worked fine, but the plugin seemed to use the XSLT from the first test for all later tests, even if there was a different XSLT file specified. Upgrading to 9.7.0-14 seems to fix this.
XSpec is not available from Google Code anymore. I saw that you discussed this in the other active pull request. The commit I use is the one you linked to in one of your comments.
I updated Saxon HE to version 9.7.0-14 because I had problems with the plugin when I built with version 9.7.0-1. The first test worked fine, but the plugin seemed to use the XSLT from the first test for all later tests, even if there was a different XSLT file specified. Upgrading to 9.7.0-14 seems to fix this.
Update: Fixed already in version 9.7.0-2. This issue might be related: https://saxonica.plan.io/issues/2530