Cannot test my model tests

I have tests in the folder:

 test/models/person/helper/age_calculator_test.rb

These test should fail because of:

  assert_equal false, true

they do fail when I run:

bundle exec m test/models/person/helper/age_calculator_test.rb

But when Im running:

bundle exec m test/models

These Tests are not run! What do I wrong? How can I test all of my Model-Test with Bundler in one command? Thanks!!