Seen in https://integration.wikimedia.org/ci/job/mediawiki-extensions-zend/9333/console (and others):
```
05:37:00 PHP Strict standards: Declaration of Tests\WikiGrok\Api\StubUser::load() should be compatible with that of User::load() in /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/extensions/WikiGrok/tests/phpunit/api/ApiResponseTest.php on line 68
05:37:00 PHP Stack trace:
05:37:00 PHP 1. {main}() /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/tests/phpunit/phpunit.php:0
05:37:00 PHP 2. PHPUnit_TextUI_Command::main() /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/tests/phpunit/phpunit.php:239
05:37:00 PHP 3. PHPUnit_TextUI_Command->run() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:129
05:37:00 PHP 4. PHPUnit_TextUI_Command->handleArguments() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:138
05:37:00 PHP 5. PHPUnit_Util_Configuration->getTestSuiteConfiguration() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:657
05:37:00 PHP 6. PHPUnit_Util_Configuration->getTestSuite() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Util/Configuration.php:797
05:37:00 PHP 7. PHPUnit_Framework_TestSuite->addTestFile() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Util/Configuration.php:912
05:37:00 PHP 8. ReflectionMethod->invoke() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:382
05:37:00 PHP 9. ExtensionsTestSuite::suite() /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/tests/phpunit/suites/ExtensionsTestSuite.php:0
05:37:00 PHP 10. ExtensionsTestSuite->__construct() /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/tests/phpunit/suites/ExtensionsTestSuite.php:35
05:37:00 PHP 11. PHPUnit_Framework_TestSuite->addTestFiles() /mnt/jenkins-workspace/workspace/mediawiki-extensions-zend@2/src/tests/phpunit/suites/ExtensionsTestSuite.php:23
05:37:00 PHP 12. PHPUnit_Framework_TestSuite->addTestFile() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:416
05:37:00 PHP 13. PHPUnit_Util_Fileloader::checkAndLoad() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:355
05:37:00 PHP 14. PHPUnit_Util_Fileloader::load() /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Util/Fileloader.php:76
```