symfony functional tests webtestcase doesn't work

Check which WebTestCase class you are using. Most probably you are using

use Symfony\Bundle\FrameworkBundle\Tests\Functional\WebTestCase

and you should be using

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

So just change this one line and you should be good

you may have mistakenly used

    Symfony\Bundle\SecurityBundle\Tests\Functional

    Symfony\Bundle\FrameworkBundle\Tests\Functional\WebTestCase

instead of

    Symfony\Bundle\FrameworkBundle\Test\WebTestCase,

CodeHunter