Initial

tests/_support/Controllers/Hello.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace App\Controllers;
+
+use CodeIgniter\Controller;
+
+class Hello extends Controller
+{
+    public function index()
+    {
+        return 'Hello';
+    }
+}

tests/_support/Controllers/Popcorn.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support\Controllers;
+
+use CodeIgniter\API\ResponseTrait;
+use CodeIgniter\Controller;
+use RuntimeException;
+
+/**
+ * This is a testing only controller, intended to blow up in multiple
+ * ways to make sure we catch them.
+ */
+class Popcorn extends Controller
+{
+    use ResponseTrait;
+
+    public function index()
+    {
+        return 'Hi there';
+    }
+
+    public function pop()
+    {
+        $this->respond('Oops', 567, 'Surprise');
+    }
+
+    public function popper()
+    {
+        throw new RuntimeException('Surprise', 500);
+    }
+
+    public function weasel()
+    {
+        $this->respond('', 200);
+    }
+
+    public function oops()
+    {
+        $this->failUnauthorized();
+    }
+
+    public function goaway()
+    {
+        return redirect()->to('/');
+    }
+
+    /**
+     * @see https://github.com/codeigniter4/CodeIgniter4/issues/1834
+     */
+    public function index3()
+    {
+        return $this->response->setJSON(['lang' => $this->request->getLocale()]);
+    }
+
+    public function canyon()
+    {
+        echo 'Hello-o-o ' . $this->request->getGet('foo');
+    }
+
+    public function cat()
+    {
+    }
+
+    public function json()
+    {
+        $this->respond(['answer' => 42]);
+    }
+
+    public function xml()
+    {
+        $this->respond('<my><pet>cat</pet></my>');
+    }
+
+    public function toindex()
+    {
+        return redirect()->route('testing-index');
+    }
+
+    public function echoJson()
+    {
+        return $this->response->setJSON($this->request->getJSON());
+    }
+}