无法发送会话cookie - 标头已经发送过PHPUnit / Laravel

Question

I have this strange problem when i call the parent::setUp() on my TestCase class for unit test a class when i run phpunit it throw me this error:

1) MatchRequestRepositoryTest::test_find_requests_by_match_id ErrorException: session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/project.dev/vendor/phpunit/phpunit/PHPUnit/TextUI/TestRunner.php:459)

What can be the problem? Thanks for any help.

Answer 1

One way to handle this in PHPUnit is to send output to stderr instead of stdout as is demonstrated by this answer.

phpunit --stderr

Or by adding stderr="true" in your phpunit.xml as is pointed out in this comment.