WikibaseMediaInfo fails a tests when run under PHPUnit 6. The suite attempts to insert a page with page_id=2 but there is already a page with that id which causes a 1062 Duplicate entry '2' for key 'PRIMARY'.
There was 1 error: 1) Wikibase\MediaInfo\Tests\MediaWiki\Maintenance\CreatePagePropsTest::testDBUpdates with data set #0 ( array( array(2, 6, 'File.jpg', '', 0, 1, 0, '20180625104925', '20180625104925', 0, 213, 'wikitext', null), array(3, 6, 'File2.jpg', '', 0, 1, 0, '20180625104925', '20180625104925', 0, 213, 'wikitext', null) ), array()) Wikimedia\Rdbms\DBQueryError: Query: INSERT INTO `unittest_page` (page_id,page_namespace,page_title,page_restrictions,page_is_redirect,page_is_new,page_random,page_touched,page_links_updated,page_latest,page_len,page_content_model,page_lang) VALUES ('2','6','File.jpg','','0','1','0','20180625104925','20180625104925','0','213','wikitext',NULL), ('3','6','File2.jpg','','0','1','0','20180625104925','20180625104925','0','213','wikitext',NULL) Function: Wikimedia\Rdbms\Database::insert Error: 1062 Duplicate entry '2' for key 'PRIMARY' (localhost:/tmp/quibble-mysql-821zo5jf/socket) /workspace/src/includes/libs/rdbms/database/Database.php:1443 /workspace/src/includes/libs/rdbms/database/Database.php:1413 /workspace/src/includes/libs/rdbms/database/Database.php:1186 /workspace/src/includes/libs/rdbms/database/Database.php:2010 /workspace/src/extensions/WikibaseMediaInfo/tests/phpunit/mediawiki/Maintenance/CreatePagePropsTest.php:114 /workspace/src/tests/phpunit/MediaWikiTestCase.php:469 /workspace/src/maintenance/doMaintenance.php:94
Repro: check experimental on dummy change: https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/WikibaseMediaInfo/+/441778/