silverstripe-framework/tests/FakeController.php

<?php
// Fake a current controller. Way harder than it should be
class FakeController extends Controller {

	public function __construct() {
		parent::__construct();

		$session = Injector::inst()->create('Session', isset($_SESSION) ? $_SESSION : array());
		$this->setSession($session);

		$this->pushCurrent();

		$this->request = new SS_HTTPRequest(
			(isset($_SERVER['X-HTTP-Method-Override']))
				? $_SERVER['X-HTTP-Method-Override']
				: $_SERVER['REQUEST_METHOD'],
			'/'
		);

		$this->response = new SS_HTTPResponse();

		$this->init();
	}
}