'no tests executed error' when using phpunit

When I am trying to run phpunit or try to run better phpunit, I am receiving the error 'no tests executed'

I have tried writing different code into the terminal to get it to run: vendor/phpunit/phpunit/phpunit --testsuite Feature Tests, ./vendor/bin/phpunit --filter only_logged_in_users_can_see_the_posts, phpunit --filter only_logged_in_users_can_see_the_posts.

I am looking to be able to get a result from any test when entering a command.