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system/Test/Mock/MockResponse.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 CodeIgniter\Test\Mock;
+
+use CodeIgniter\HTTP\Response;
+
+/**
+ * Class MockResponse
+ */
+class MockResponse extends Response
+{
+    /**
+     * If true, will not write output. Useful during testing.
+     *
+     * @var bool
+     */
+    protected $pretend = true;
+
+    // for testing
+    public function getPretend()
+    {
+        return $this->pretend;
+    }
+
+    // artificial error for testing
+    public function misbehave()
+    {
+        $this->statusCode = 0;
+    }
+}