Ruby unit testing - access test result (success/failure)?

I'm using Ruby 2.2. I need to run a unit test and get information if it succeeded or failed. I'm browsing through docs of both test-unit and minitest (suggested gems for unit testing in Ruby 2.2) but I can't seem to find a method that would return or store somewhere information about the test result.

All I need is information whether the test failed/succeeded, and I need to access it from the level of Ruby. I imagine I would have to use a specific method to run the test - so far, I was only able to run a single test by running the test file, not by invoking any method.

Maybe it's just my poor knowledge of Ruby, anyway I would appreciate any help.