John Davidson

Message:

Versions :

• PHP : 8.1


• PHPUnit : 9.5.21


• Symfony 6.1

When the following test is run by PhpUnit, I get an error about the session not being able to be started. Does anyone have an idea of the problem and how to solve it?

The following topics do not answer my problem or the proposed solution doesn't work for me :

• How to fix headers already sent


• Cannot send session cookie headers already sent


• Github discution 43950

I tried the proposed solutions of the second link : @session_start(), @runInSeparateProcess but nothing worked.
Maybe I just misunderstand my problem but I'm stuck for a week now.

protected function setUp(): void

{

  @session_start();

  parent::setUp();

}



/**

 * @runInSeparateProcess

 */

public function testLoginFailure(): void

{

    $client = static::createClient();

    $crawler = $client->request('GET', '/login');



    $form = $crawler->selectButton('Login')->form();



    $form['email']->setValue('[email protected]');

    $form['password']->setValue('123abcABC%');



    $crawler = $client->submit($form);

    $this->assertResponseIsSuccessful();

}

<!-- Failed to start the session because headers have already been sent by &quot;C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Util\Printer.php&quot; at line 104. (500 Internal Server Error) -->



C:\Users\cimba\Documents\project\vendor\symfony\framework-bundle\Test\BrowserKitAssertionsTrait.php:142

C:\Users\cimba\Documents\project\vendor\symfony\framework-bundle\Test\BrowserKitAssertionsTrait.php:33

C:\Users\cimba\Documents\project\tests\InternalLoginTest.php:51

C:\Users\cimba\Documents\project\bin\phpunit:11



Caused by

ErrorException: Failed to start the session because headers have already been sent by "C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Util\Printer.php" at line 104. in C:\Users\cimba\Documents\project\vendor\symfony\http-foundation\Session\Storage\NativeSessionStorage.php:135

Stack trace:

#0 C:\Users\cimba\Documents\project\vendor\symfony\framework-bundle\Test\BrowserKitAssertionsTrait.php(33): Symfony\Bundle\FrameworkBundle\Test\WebTestCase::assertThatForResponse(Object(Symfony\Component\HttpFoundation\Test\Constraint\ResponseIsSuccessful), '')

#1 C:\Users\cimba\Documents\project\tests\InternalLoginTest.php(51): Symfony\Bundle\FrameworkBundle\Test\WebTestCase::assertResponseIsSuccessful()

#2 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestCase.php(1545): App\Tests\InternalLoginTest->testLoginFailure()

#3 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestCase.php(1151): PHPUnit\Framework\TestCase->runTest()

#4 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestResult.php(726): PHPUnit\Framework\TestCase->runBare()

#5 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestCase.php(903): PHPUnit\Framework\TestResult->run(Object(App\Tests\InternalLoginTest))

#6 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestSuite.php(670): PHPUnit\Framework\TestCase->run(Object(PHPUnit\Framework\TestResult))

#7 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\Framework\TestSuite.php(670): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))

#8 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\TextUI\TestRunner.php(673): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))

#9 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\TextUI\Command.php(143): PHPUnit\TextUI\TestRunner->run(Object(PHPUnit\Framework\TestSuite), Array, Array, true)

#10 C:\Users\cimba\Documents\project\vendor\phpunit\phpunit\src\TextUI\Command.php(96): PHPUnit\TextUI\Command->run(Array, true)

#11 C:\Users\cimba\Documents\project\bin\phpunit(11): PHPUnit\TextUI\Command::main()

#12 C:\Users\cimba\AppData\Local\Temp\ide-phpunit.php(224): require_once('C:\\Users\\cimba\\...')

#13 C:\Users\cimba\AppData\Local\Temp\ide-phpunit.php(173): IDE_PHPUnit_Loader::loadByAutoloader('C:\\Users\\cimba\\...')

#14 C:\Users\cimba\AppData\Local\Temp\ide-phpunit.php(228): IDE_PHPUnit_Loader::init()

#15 {main}

framework.yaml

framework:

    secret: '%env(APP_SECRET)%'

    http_method_override: false

    session:

        handler_id: null

        cookie_secure: auto

        cookie_samesite: lax

        storage_factory_id: session.storage.factory.native

    php_errors:

        log: true



when@test:

    framework:

        test: true

        session:

            storage_factory_id: session.storage.factory.mock_file

---

My Answer:
It seems like the issue you are facing is related to output being sent before starting the session. This can happen if there is any whitespace or characters being output before the session_start() function is called.

One possible solution to this issue is to check your code for any whitespace or characters being output before the session_start() function. Make sure that there is no output being sent before starting the session.

You can also try moving the session_start() function to the bootstrap file of your PHPUnit tests. This way, the session will be started before any output is sent.

Another solution is to use output buffering to prevent any output from being sent before starting the session. You can use ob_start() at the beginning of your test script to start output buffering.

If none of these solutions work, you may need to further investigate your code to identify any other potential causes of the issue. It's possible that there may be some other code or configuration that is interfering with the session initialization process.

I hope these suggestions help you resolve the issue you are facing with starting the session in your Symfony PHPUnit tests.