autoload: always load Yii.php to fix 'Class Yii not found' error
Error: Class 'Yii' not found
.../yii2-client-cert-auth/vendor/yiisoft/yii2/base/Application.php:196
.../yii2-client-cert-auth/tests/TestCase.php:19
.../yii2-client-cert-auth/tests/SubjectTest.php:25
/usr/share/php/PHPUnit/TextUI/Command.php:155
/usr/share/php/PHPUnit/TextUI/Command.php:106