test: fix test code

Author: kenjis

tests/system/CodeIgniterTest.php

@@ -94,15 +94,15 @@ public function testRun404Override()
         // Inject mock router.
         $routes = Services::routes();
         $routes->setAutoRoute(false);
-        $routes->set404Override('Home::index');
+        $routes->set404Override('Tests\Support\Controllers\Hello::index');
         $router = Services::router($routes, Services::request());
         Services::injectMock('router', $router);
 
         ob_start();
-        $this->codeigniter->useSafeOutput(true)->run();
+        $this->codeigniter->useSafeOutput(true)->run($routes);
         $output = ob_get_clean();
 
-        $this->assertStringContainsString('Welcome to CodeIgniter', $output);
+        $this->assertStringContainsString('Hello', $output);
     }
 
     public function testRun404OverrideControllerReturnsResponse()