ruby test/functional/person_controller.rb
ruby test/functional/person_controller.rb -n test_that_will_run
ruby test/functional/person_controller.rb -n /that_one_end_point_name/
Even if you dynamically generate tests, when ruby loads the test file it will be able to reference all tests. This means you can either call out any test by name or use some simple regex to run only a specific subset of tests.