1) Chatea\MyBundle\Tests\Controller\ChannelControllerTest::testSecurityRolesCanCreateChannelAction
Invalid argument supplied for foreach()

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/var/www/workspace/apiChatea/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php:129
/var/www/workspace/apiChatea/app/bootstrap.php.cache:2867
/var/www/workspace/apiChatea/app/bootstrap.php.cache:2820
/var/www/workspace/apiChatea/app/bootstrap.php.cache:2944
/var/www/workspace/apiChatea/app/bootstrap.php.cache:2245
/var/www/workspace/apiChatea/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Client.php:81
/var/www/workspace/apiChatea/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Client.php:111
/var/www/workspace/apiChatea/vendor/symfony/symfony/src/Symfony/Component/BrowserKit/Client.php:330
/var/www/workspace/apiChatea/src/Chatea/MyBundle/Tests/Controller/ChannelControllerTest.php:99
/usr/share/php/PHPUnit/TextUI/Command.php:192
/usr/share/php/PHPUnit/TextUI/Command.php:130