test: remove dynamic property

Author: kenjis

tests/_support/Filters/Customfilter.php

@@ -18,7 +18,7 @@ class Customfilter implements \CodeIgniter\Filters\FilterInterface
 {
     public function before(RequestInterface $request, $arguments = null)
     {
-        $request->url = 'http://hellowworld.com';
+        $request->appendBody('http://hellowworld.com');
 
         return $request;
     }

tests/system/CodeIgniterTest.php

@@ -200,7 +200,7 @@ public function testControllersRunFilterByClassName()
 
         // Inject mock router.
         $routes = Services::routes();
-        $routes->add('pages/about', static fn () => Services::request()->url, ['filter' => Customfilter::class]);
+        $routes->add('pages/about', static fn () => Services::request()->getBody(), ['filter' => Customfilter::class]);
 
         $router = Services::router($routes, Services::request());
         Services::injectMock('router', $router);
@@ -210,6 +210,8 @@ public function testControllersRunFilterByClassName()
         $output = ob_get_clean();
 
         $this->assertStringContainsString('http://hellowworld.com', $output);
+
+        $this->resetServices();
     }
 
     public function testResponseConfigEmpty()