https://integration.wikimedia.org/ci/job/mediawiki-extensions-qunit-jessie/19494/console fails due a Cannot find site mywiki in sites table error which is injected in a javascript file /index.php?title=Special:JavaScriptTest/qunit/export. That causes the web browser to not process the javascript and thus fail the qunit build.
From a previous discussion, it seems the fix would be to properly initializing the site table when installing/updating MediaWiki with Wikibase: T126596
00:02:38 PHP Notice: Cannot find site mywiki in sites table [Called from Wikibase\Client\WikibaseClient::newSiteGroup in /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php at line 734] in /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/debug/MWDebug.php on line 309 00:02:38 PHP Stack trace: 00:02:38 PHP 1. {main}() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/maintenance/update.php:0 00:02:38 PHP 2. require_once() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/maintenance/update.php:217 00:02:38 PHP 3. UpdateMediaWiki->execute() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/maintenance/doMaintenance.php:111 00:02:38 PHP 4. LoggedUpdateMaintenance->execute() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/maintenance/update.php:184 00:02:38 PHP 5. FlowCreateTemplates->doDBUpdates() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/maintenance/Maintenance.php:1576 00:02:38 PHP 6. FlowCreateTemplates->create() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Flow/maintenance/FlowCreateTemplates.php:86 00:02:38 PHP 7. WikiPage->doEditContent() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Flow/maintenance/FlowCreateTemplates.php:115 00:02:38 PHP 8. WikiPage->prepareContentForEdit() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/page/WikiPage.php:1688 00:02:38 PHP 9. AbstractContent->getParserOutput() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/page/WikiPage.php:2153 00:02:38 PHP 10. Hooks::run() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/content/AbstractContent.php:501 00:02:38 PHP 11. call_user_func_array:{/home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/Hooks.php:195}() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/Hooks.php:195 00:02:38 PHP 12. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::onContentAlterParserOutput() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/Hooks.php:195 00:02:38 PHP 13. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::newFromGlobalState() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:67 00:02:38 PHP 14. Wikibase\Client\WikibaseClient->getLangLinkHandler() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:48 00:02:38 PHP 15. Wikibase\Client\WikibaseClient->getLangLinkSiteGroup() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:847 00:02:38 PHP 16. Wikibase\Client\WikibaseClient->getSiteGroup() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:713 00:02:38 PHP 17. Wikibase\Client\WikibaseClient->newSiteGroup() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:752 00:02:38 PHP 18. wfWarn() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:734 00:02:38 PHP 19. MWDebug::warning() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/GlobalFunctions.php:1142 00:02:38 PHP 20. MWDebug::sendMessage() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/debug/MWDebug.php:164 00:02:38 PHP 21. trigger_error() /home/jenkins/workspace/mediawiki-extensions-qunit-jessie/src/includes/debug/MWDebug.php:309