Larave 5.8 .env.testing file is not working

I created an .env.testing file with my credentials, everything the same as .env besides a different table name for the database.

I tried php artisan config:clear which apparently deletes the cached config file in bootstrap/cache/config.php and it actually broke the database connection. If I recached the file by running php artisan config:cache the cached file is back, but without the credentials in the .env.testing file. When I run phpunit again it connects to the wrong DB, the DB name that is stored in .env not .env.testing.

Is this for real? Did latest Laravel release break test environments?