Symfony version(s) affected: 4.2.3

Description
i run a bin/phpunit and see a deprecation message
Remaining deprecation notices (12).

i want to disable it and i edit .env.test
SYMFONY_DEPRECATIONS_HELPER=disabled
but the message is still appears.

so, i dumped here
https://github.com/symfony/phpunit-bridge/blob/master/bootstrap.php#L38
and SYMFONY_DEPRECATIONS_HELPER return false.

SYMFONY_DEPRECATIONS_HELPER dont load frpm .env.test and phpunit.xml.dist

possible solution is export variable before testing, but i think is not good, because SYMFONY_DEPRECATIONS_HELPER present in .env.test by default