Noticed by @D3r1ck01
With patch https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Echo/+/465288 contained;
```
3) MediaWiki\Notifications\EchoUserNotificationGatewayTest::testMarkRead
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:131
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:98
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:15
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
4) MediaWiki\Notifications\EchoUserNotificationGatewayTest::testMarkAllRead
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:131
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:98
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:29
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
5) MediaWiki\Notifications\EchoUserNotificationGatewayTest::testGetNotificationCount
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:131
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:98
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:39
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
6) MediaWiki\Notifications\EchoUserNotificationGatewayTest::testGetUnreadNotifications
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:131
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:98
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:56
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
```
On `master` before patch above
```
There were 4 errors:
1) EchoUserNotificationGatewayTest::testMarkRead
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:10
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
2) EchoUserNotificationGatewayTest::testMarkAllRead
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:24
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
3) EchoUserNotificationGatewayTest::testGetNotificationCount
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:34
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
4) EchoUserNotificationGatewayTest::testGetUnreadNotifications
count(): Parameter must be an array or an object that implements Countable
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:126
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:93
/usr/local/var/www/wiki/mw-core/extensions/Echo/tests/phpunit/gateway/UserNotificationGatewayTest.php:51
/usr/local/var/www/wiki/mw-core/tests/phpunit/MediaWikiTestCase.php:416
/usr/local/var/www/wiki/mw-core/maintenance/doMaintenance.php:94
```