diff --git a/flight/core/Dispatcher.php b/flight/core/Dispatcher.php
index 73fda85..6af0d66 100644
--- a/flight/core/Dispatcher.php
+++ b/flight/core/Dispatcher.php
@@ -71,7 +71,6 @@ class Dispatcher
 
     /**
      * @param array<int, mixed> &$params
-     * @param mixed &$output
      *
      * @return void|mixed
      * @throws Exception
@@ -116,10 +115,6 @@ class Dispatcher
      */
     public function set(string $name, callable $callback): self
     {
-        if ($this->get($name) !== null) {
-            trigger_error("Event '$name' has been overriden!", E_USER_NOTICE);
-        }
-
         $this->events[$name] = $callback;
 
         return $this;
diff --git a/tests/DocExamplesTest.php b/tests/DocExamplesTest.php
new file mode 100644
index 0000000..76bbb21
--- /dev/null
+++ b/tests/DocExamplesTest.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use Exception;
+use Flight;
+use flight\Engine;
+use PHPUnit\Framework\TestCase;
+use Throwable;
+
+class DocExamplesTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        $_SERVER = [];
+        $_REQUEST = [];
+        Flight::init();
+        Flight::setEngine(new Engine());
+    }
+
+    protected function tearDown(): void
+    {
+        unset($_REQUEST);
+        unset($_SERVER);
+        Flight::clear();
+    }
+
+    public function testMapNotFoundMethod()
+    {
+        Flight::map('notFound', function () {
+            Flight::json([], 404);
+        });
+
+        Flight::request()->url = '/not-found';
+
+        Flight::route('/', function () {
+            echo 'hello world!';
+        });
+
+        Flight::start();
+        ob_get_clean();
+        $this->assertEquals(404, Flight::response()->status());
+        $this->assertEquals('[]', Flight::response()->getBody());
+    }
+
+    public function testMapErrorMethod()
+    {
+        Flight::map('error', function (Throwable $error) {
+            // Handle error
+            echo 'Custom: ' . $error->getMessage();
+        });
+
+        Flight::app()->handleException(new Exception('Error'));
+        $this->expectOutputString('Custom: Error');
+    }
+}