Symfony 4: WebTestCase fails (Failed to start the session)

Question

I'm trying to setup a simple WebTestCase which makes a GET request to the given URL using Symfony 4 (and "phpunit/phpunit": "^6.5"). However, the test fails with:

Failed to start the session because headers have already been sent by \vendor\phpunit\phpunit\src\Util\Printer.php; at line 112. (500 Internal Server Error)

Test Class:

class ControllerTest extends WebTestCase
{
    public function testGetArticles()
    {
        $client = static::createClient();
        $client->request('GET', '/articles');
        $this->assertEquals(Response::HTTP_OK, $client->getResponse()->getStatusCode());
    }
}

Controller (which contains articles route:

/** @Route(path="articles", name="article_list") */  
public function article_list(Request $request)
{
    return $this->render("article/list.html.twig", array(
        "articles" => $this->entityManager->getRepository("App:Article")->getArticles()
    ));
}

framework.yaml:

framework:
    secret: '%env(APP_SECRET)%'
    csrf_protection: ~
    session:
        # With this config, PHP's native session handling is used
        handler_id: ~

These tests were running fine in Symfony 3, in SF 4 not. What is wrong with this test or configuration?

Ok, thanks. But I didn't get why this works with SF 3 but not with SF 4 without using e.g. the @runInSeparateProcess annotation. This error occurs on all Tests for me (using SF 4), so I've to annotate each test with @runInSeparateProcess ? Feels some kind of wrong to me :/ — baris1892
– baris1892, Commented Jan 1, 2018 at 19:37

gmoty · Accepted Answer · 2018-01-09 00:18:23Z

10

You must uncomment session section in config\Packages\test\framework.yaml.

session:
        storage_id: session.storage.mock_file

answered Jan 9, 2018 at 0:18

gmoty

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2 Comments

baris1892 Over a year ago

Perfect, this works fine! Is this somewhere properly documented?

Shawn C Over a year ago

1a) This is documented here: symfony.com/doc/4.4/reference/configuration/… 1b) Best info on what this does I could find was in the repo: github.com/symfony/symfony/blob/… 2a) THIS IS DEPRECATED as of 5.3. Use storage_factory_id: session.storage.factory.mock_file 2b) See: symfony.com/doc/current/reference/configuration/…

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