chore: fix merge mistake

Author: SamMousa

src/Codeception/Lib/Connector/Yii2.php

@@ -15,20 +15,16 @@
 use Symfony\Component\BrowserKit\CookieJar;
 use Symfony\Component\BrowserKit\History;
 use Symfony\Component\BrowserKit\Request as BrowserkitRequest;
-use yii\web\Request as YiiRequest;
 use Symfony\Component\BrowserKit\Response;
 use Yii;
-use yii\base\Component;
 use yii\base\Event;
 use yii\base\ExitException;
 use yii\base\Security;
 use yii\base\UserException;
 use yii\mail\BaseMessage;
-use yii\mail\MailEvent;
 use yii\web\Application;
-use yii\web\ErrorHandler;
 use yii\web\IdentityInterface;
-use yii\web\Request;
+use yii\web\Request as YiiRequest;
 use yii\web\Response as YiiResponse;
 use yii\web\User;
 
@@ -308,7 +304,11 @@ public function startApp(?\yii\log\Logger $logger = null): void
         }
 
         $config = $this->mockMailer($config);
-        Yii::$app = Yii::createObject($config);
+        $app = Yii::createObject($config);
+        if (!$app instanceof \yii\base\Application) {
+            throw new ModuleConfigException($this, "Failed to initialize Yii2 app");
+        }
+        \Yii::$app = $app;
 
         if ($logger instanceof \yii\log\Logger) {
             Yii::setLogger($logger);

src/Codeception/Module/Yii2.php

@@ -22,14 +22,13 @@
 use Symfony\Component\BrowserKit\History;
 use Yii;
 use yii\base\Security;
-use yii\web\Application as WebApplication;
 use yii\db\ActiveQueryInterface;
 use yii\db\ActiveRecordInterface;
 use yii\helpers\Url;
 use yii\mail\BaseMessage;
 use yii\mail\MessageInterface;
 use yii\test\Fixture;
-use yii\web\Application;
+use yii\web\Application as WebApplication;
 use yii\web\IdentityInterface;
 
 /**