Memory limit also affects PHPunit tests

[mariano-dagostino]

 ✔ Some tests result:

PHP Fatal error:  Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) in /var/www/html/vendor/symfony/dependency-injection/Definition.php on line 521

It seems we should run phpunit without memory limits. This is not replicable in drupal-starter, you need a project with more tests.