Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/browser-kit/Tests/HistoryTest.php:18 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/browser-kit/Tests/HistoryTest.php on line 18