Added a small comment

Nyholm · Nyholm · commit 67077c123882 · 2022-04-24T21:41:06.000+02:00
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Fixtures/ExceptionListener.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Fixtures/ExceptionListener.php
@@ -4,6 +4,15 @@
 
 use Symfony\Component\HttpKernel\Event\ExceptionEvent;
 
+/**
+ * This listener allows you to inspect all exceptions thrown by the application.
+ * This is useful since the HttpKernel catches all exceptions and turn them into
+ * an HTTP response.
+ *
+ * This class should only be used in tests.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
 class ExceptionListener
 {
     private static array $exceptions = [];
