https://integration.wikimedia.org/ci/job/mediawiki-core-code-coverage/2645/console
There were 2 failures: 1) WatchedItemStoreIntegrationTest::testUpdateResetAndSetNotificationTimestamp Failed asserting that Wikimedia\Rdbms\ResultWrapper Object &0000000023831513000000001899febd ( 'result' => Array &0 () 'mAffectedRows' => 1 '_hasDataForTestClass' => 'WatchedItemStoreIntegrationTest' 'mLastQuery' => 'UPDATE unittest_watchlist SET wl_notificationtimestamp = '20200202020202' WHERE wl_user = '16' AND ((wl_namespace = '0' AND wl_title = 'WatchedItemStoreIntegrationTestPage'))' ) is true
This failure has been around for a long time, but is now visible because we no longer ignore PHPUnit failures when generating code coverage - per 4c65c6e46fae1a7a1b84cb39c5158a893eb48013.