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system/Test/Mock/MockCodeIgniter.php

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+<?php
+
+/**
+ * This file is part of the 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\CodeIgniter;
+
+class MockCodeIgniter extends CodeIgniter
+{
+	protected function callExit($code)
+	{
+		// Do not call exit() in testing.
+	}
+}