fix: FeatureTest may cause risky tests

system/CodeIgniter.php

@@ -468,6 +468,8 @@ protected function handleRequest(?RouteCollectionInterface $routes, Cache $cache
 
             // If a ResponseInterface instance is returned then send it back to the client and stop
             if ($possibleResponse instanceof ResponseInterface) {
+                $this->outputBufferingEnd();
+
                 return $possibleResponse;
             }
 

system/Test/FeatureTestTrait.php

@@ -51,7 +51,11 @@ protected function withRoutes(?array $routes = null)
             $collection->resetRoutes();
 
             foreach ($routes as $route) {
-                $collection->{$route[0]}($route[1], $route[2]);
+                if (isset($route[3])) {
+                    $collection->{$route[0]}($route[1], $route[2], $route[3]);
+                } else {
+                    $collection->{$route[0]}($route[1], $route[2]);
+                }
             }
         }
 

tests/_support/Config/Filters.php

@@ -11,4 +11,8 @@
 
 namespace Tests\Support\Config\Filters;
 
-$filters->aliases['test-customfilter'] = \Tests\Support\Filters\Customfilter::class;
+/**
+ * @psalm-suppress UndefinedGlobalVariable
+ */
+$filters->aliases['test-customfilter']   = \Tests\Support\Filters\Customfilter::class;
+$filters->aliases['test-redirectfilter'] = \Tests\Support\Filters\RedirectFilter::class;

tests/_support/Filters/RedirectFilter.php

@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support\Filters;
+
+use CodeIgniter\HTTP\RequestInterface;
+use CodeIgniter\HTTP\ResponseInterface;
+
+class RedirectFilter implements \CodeIgniter\Filters\FilterInterface
+{
+    public function before(RequestInterface $request, $arguments = null)
+    {
+        return redirect()->to('login');
+    }
+
+    public function after(RequestInterface $request, ResponseInterface $response, $arguments = null): void
+    {
+    }
+}

tests/system/Test/FeatureTestTraitTest.php

@@ -77,6 +77,21 @@ public function testCallGetAndUriString(): void
         $this->assertSame('http://example.com/index.php/foo/bar/1/2/3', current_url());
     }
 
+    public function testCallGetAndFilterReturnsResponse(): void
+    {
+        $this->withRoutes([
+            [
+                'get',
+                'admin',
+                static fn () => 'Admin Area',
+                ['filter' => 'test-redirectfilter'],
+            ],
+        ]);
+        $response = $this->get('admin');
+
+        $response->assertRedirectTo('login');
+    }
+
     public function testClosureWithEcho()
     {
         $this->withRoutes([