Noticed by @D3r1ck01
20:32:15 1) EchoUserNotificationGatewayTest::testMarkRead 20:32:15 count(): Parameter must be an array or an object that implements Countable 20:32:15 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:10 20:32:15 /workspace/src/tests/phpunit/MediaWikiTestCase.php:424 20:32:15 /workspace/src/maintenance/doMaintenance.php:94 20:32:15 20:32:15 2) EchoUserNotificationGatewayTest::testMarkAllRead 20:32:15 count(): Parameter must be an array or an object that implements Countable 20:32:15 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:24 20:32:15 /workspace/src/tests/phpunit/MediaWikiTestCase.php:424 20:32:15 /workspace/src/maintenance/doMaintenance.php:94 20:32:15 20:32:15 3) EchoUserNotificationGatewayTest::testGetNotificationCount 20:32:15 count(): Parameter must be an array or an object that implements Countable 20:32:15 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:34 20:32:15 /workspace/src/tests/phpunit/MediaWikiTestCase.php:424 20:32:15 /workspace/src/maintenance/doMaintenance.php:94 20:32:15 20:32:15 4) EchoUserNotificationGatewayTest::testGetUnreadNotifications 20:32:15 count(): Parameter must be an array or an object that implements Countable 20:32:15 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93 20:32:15 /workspace/src/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:51 20:32:15 /workspace/src/tests/phpunit/MediaWikiTestCase.php:424 20:32:15 /workspace/src/maintenance/doMaintenance.php:94
https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-php72-docker/22/consoleFull
Can be verified by commenting "check experimental" on a patch to trigger the PHP 7.2 job.