[PHPUnit\Framework\Exception] ini_set(): Headers already sent. You cannot change the session module's ini settings at this time

[mickral]

Hi, I setup codeception framework and when I'm trying to run functional test suite I receive error
[PHPUnit\Framework\Exception] ini_set(): Headers already sent. You cannot change the session module's ini settings at this time

How can I dismiss this error to finish setup

We are using PHP + Symfony running in container

Details

• Codeception version: 4.1.8
• PHP Version: 7.3.11
• Symfony: 5.1.7
• Operating System: Red Hat
• Installation type: Composer
• functional.suite.yml:

 #Codeception Test Suite Configuration
 #Suite for functional tests
 #Emulate web requests and make application process them
 #Include one of framework modules (Symfony2, Yii2, Laravel5, Phalcon4) to use it
 #Remove this suite if you don't use frameworks
actor: FunctionalTester
modules:
    enabled:
        - Symfony:
              app_path: 'src'
              environment: '%APP_ENV%'
        - Doctrine2:
            depends: Symfony
            cleanup: true
        # add a framework module here
        - \Helper\Functional
    step_decorators: ~   

• framework.yaml config file:
  see https://symfony.com/doc/current/reference/configuration/framework.html

  framework:
    secret: '%env(APP_SECRET)%'
    #csrf_protection: true
    #http_method_override: true
    #Enables session support. Note that the session will ONLY be started if you read or write from it.
    #Remove or comment this section to explicitly disable session support.
    session:
        handler_id: 'session.handler.native_file'
        save_path: '%kernel.project_dir%/var/sessions/%kernel.environment%'
        cookie_secure: auto
        cookie_samesite: lax
    #esi: true
    #fragments: true
    php_errors:
        log: true

[ThomasLandauer]

I opened another (somewhat similar) issue: #42

What happens when you set (in framework.yaml): handler_id to null, and delete save_path?

[TavoNiievez]

I am closing this in favor of #42, where possible causes are mentioned.