diff --git a/src/AppTesting.php b/src/AppTesting.php
index c68969f..5091431 100644
--- a/src/AppTesting.php
+++ b/src/AppTesting.php
@@ -53,11 +53,12 @@ public function runCliWithExec(string $command) : void
      */
     protected function suppressOutputBuffer(Closure $closure) : void
     {
-        \ob_start(static function () {
-            return '';
-        });
-        $closure($this->app);
-        \ob_end_clean();
+        \ob_start(static fn () => '');
+        try {
+            $closure($this->app);
+        } finally {
+            \ob_end_clean();
+        }
     }
 
     /**
diff --git a/tests/RealTestCaseTest.php b/tests/RealTestCaseTest.php
index a640962..140d3e9 100644
--- a/tests/RealTestCaseTest.php
+++ b/tests/RealTestCaseTest.php
@@ -34,6 +34,20 @@ public function testHttp() : void
         self::assertMatchedRouteName('not-found');
     }
 
+    public function testExceptionBeforeRouteAction() : void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Invalid URL: invalid-url');
+        $this->app->runHttp('invalid-url');
+    }
+
+    public function testExceptionInRouteAction() : void
+    {
+        $this->expectException(\LogicException::class);
+        $this->expectExceptionMessage('Error in route action');
+        $this->app->runHttp('http://localhost/error');
+    }
+
     public function testResponseStatus() : void
     {
         $this->app->runHttp('http://localhost');
diff --git a/tests/config/router.php b/tests/config/router.php
index cba913a..3144c64 100644
--- a/tests/config/router.php
+++ b/tests/config/router.php
@@ -7,5 +7,17 @@
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
+use Framework\Routing\RouteCollection;
+use Framework\Routing\Router;
+
 return [
+    'default' => [
+        'callback' => static function (Router $router) : void {
+            $router->serve('http://localhost', static function (RouteCollection $routes) : void {
+                $routes->get('/error', static function () : void {
+                    throw new \LogicException('Error in route action');
+                });
+            });
+        },
+    ],
 ];