It seems that during the migration also the sling testing tools have not been migrated (sling-org-apache-sling-testing-tools). Originally they have been here: https://github.com/apache/sling-old-svn-mirror/blob/trunk/testing/tools/pom.xml <https://github.com/apache/sling-old-svn-mirror/blob/trunk/testing/tools/pom.xml>. But I cannot find an according repository at https://github.com/apache/sling-org-apache-sling-testing-tools <https://github.com/apache/sling-org-apache-sling-testing-tools>.
Konrad