Edit: RequestStackTest.php

Editing: RequestStackTest.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation\Tests;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;

class RequestStackTest extends \PHPUnit_Framework_TestCase
{
    public function testGetCurrentRequest()
    {
        $requestStack = new RequestStack();
        $this->assertNull($requestStack->getCurrentRequest());

$request = Request::create('/foo');

$requestStack->push($request);
        $this->assertSame($request, $requestStack->getCurrentRequest());

$this->assertSame($request, $requestStack->pop());
        $this->assertNull($requestStack->getCurrentRequest());

$this->assertNull($requestStack->pop());
    }

public function testGetMasterRequest()
    {
        $requestStack = new RequestStack();
        $this->assertNull($requestStack->getMasterRequest());

$masterRequest = Request::create('/foo');
        $subRequest = Request::create('/bar');

$requestStack->push($masterRequest);
        $requestStack->push($subRequest);

$this->assertSame($masterRequest, $requestStack->getMasterRequest());
    }

public function testGetParentRequest()
    {
        $requestStack = new RequestStack();
        $this->assertNull($requestStack->getParentRequest());

$masterRequest = Request::create('/foo');

$requestStack->push($masterRequest);
        $this->assertNull($requestStack->getParentRequest());

$firstSubRequest = Request::create('/bar');

$requestStack->push($firstSubRequest);
        $this->assertSame($masterRequest, $requestStack->getParentRequest());

$secondSubRequest = Request::create('/baz');

$requestStack->push($secondSubRequest);
        $this->assertSame($firstSubRequest, $requestStack->getParentRequest());
    }
}