skip exiting in test env.

framework/base/Application.php

@@ -515,7 +515,7 @@ abstract class Application extends Module
 				$handler->handle($exception);
 			} else {
 				echo $this->renderException($exception);
-				if (PHP_SAPI === 'cli') {
+				if (PHP_SAPI === 'cli' && !YII_ENV_TEST) {
 					exit(1);
 				}
 			}

framework/base/ErrorHandler.php

@@ -87,7 +87,10 @@ class ErrorHandler extends Component
 	{
 		if (Yii::$app instanceof \yii\console\Application || YII_ENV_TEST) {
 			echo Yii::$app->renderException($exception);
-			exit(1);
+			if (!YII_ENV_TEST) {
+				exit(1);
+			}
+			return;
 		}
 
 		$useErrorView = !YII_DEBUG || $exception instanceof UserException;