在php中存根方法

我有一个问题，我不知道怎么说，当x被调用时，它期望y至少被调用一次，并且我不在乎y做什么，只要被调用即可。

因此，如果我们看这个例子：

public static function createAction($params) {
    $postParams = $params->request()->post();

    // Controller logic here ...

    $params->redirect('/signin');
  }

在下面的测试中，我想做的就是说-我希望redirect()参数'/singin'被称为1次。

我的测试看起来像：

<?php

use \GP\Models\User;
use Slim\Environment;
use \GP\Controllers\UserController;

class UserControllerTest extends PHPUnit_Framework_TestCase {

    protected $em;

    protected $app;

    public function setUp() {
        $this->em = getEntityManager(true);
        $tool = new \Doctrine\ORM\Tools\SchemaTool($this->em);

        $mdFactory = $this->em->getMetadataFactory();
        $tool->dropSchema($mdFactory->getallMetadata());
        $tool->createSchema($mdFactory->getallMetadata());
        parent::setUp();

        $_SESSION = array();
        $this->app = new \Slim\Slim(array('mode' => 'testing'));
    }

    public function tearDown() {
        $tool = new \Doctrine\ORM\Tools\SchemaTool($this->em);

        $mdFactory = $this->em->getMetadataFactory();
        $tool->dropSchema($mdFactory->getallMetadata());
        parent::tearDown();
    }

    public function testUserCreate() {
        Environment::mock(array(
            'REQUEST_METHOD' => 'POST',
            'slim.input'     => 'firstname=user&lastname=somethingelse&username=admin&[email protected]&password=1234567890&repassword=1234567890'
        ));

        UserController::createAction($this->app);

        $user = $this->em->getRepository('\GP\Models\User')
                     ->findBy(array('user_name' => 'admin'));

        $this->assertNotEmpty($user);
    }
}

当它运行时，我得到：

$ phpunit
PHPUnit 4.6.6 by Sebastian Bergmann and contributors.

Configuration read from /var/www/html/Grab-Project/phpunit.xml

....E

Time: 13.45 seconds, Memory: 21.25Mb

There was 1 error:

1) UserControllerTest::testUserCreate
Slim\Exception\Stop: 

/var/www/html/Grab-Project/vendor/slim/slim/Slim/Slim.php:1022
/var/www/html/Grab-Project/vendor/slim/slim/Slim/Slim.php:1042
/var/www/html/Grab-Project/vendor/slim/slim/Slim/Slim.php:1105
/var/www/html/Grab-Project/app/Controllers/UserController.php:73
/var/www/html/Grab-Project/tests/app/controllers/UserControllerTest.php:40

FAILURES!
Tests: 5, Assertions: 8, Errors: 1.

当它尝试调用重定向时，会发生此问题。这是因为我没有在测试中指定苗条应该重定向的位置，相反，我想对该方法进行存根并说，我希望在数据库中找到该用户，就像我一样，并且我希望此带有此参数的方法被调用一次。

我如何在Rails中执行此操作，但阅读文档会使我感到困惑...