In a custom extension, I have a unit test that was working fine in MediaWiki 1.26, but it fails in MediaWiki 1.27. I'd appreciate any pointers in the right direction. The extension performs a page move, more or less like this (but with error checking): $mp = new MovePage($source, $destination); $result = $mp->move($context->getUser(), $reason, false); The code works fine on a running wiki, but in a unit test under MW 1.27, I get this error: MWException: No valid null revision produced in MovePage::moveToInternal The test seem to be running into issues with the LinkCache. The call to MovePage::move hits this line: $pageid = $this->oldTitle->getArticleID( Title::GAID_FOR_UPDATE ); which returns zero instead of the page's proper article ID. (This did not happen in MediaWiki 1.26.) Inside of Title::getArticleID we find these lines: if ( $flags & self::GAID_FOR_UPDATE ) { $oldUpdate = $linkCache->forUpdate( true ); $linkCache->clearLink( $this ); $this->mArticleID = $linkCache->addLinkObj( $this ); $linkCache->forUpdate( $oldUpdate ); } The call to LinkCache::addLinkObj($this) returns zero. As a result, MovePage::moveInternal fails and we get the error message shown above. So, I am wondering if anyone has any insights why this began happening with MW 1.27, and what directions I should explore to make my test work again. Thank you very much. DanB