Rails 5 gave us the ability to run single minitest cases via the line number. For example:
`bundle exe rails test test/unit/authorizer_test.rb:14`

This however does not work currently.

Also possibly related, when tests fail then the output at the end gives us:
```
Focus on failing tests:
ruby ../../../.rvm/gems/ruby-2.4.1/gems/minitest-spec-rails-5.4.0/lib/minitest-spec-rails/dsl.rb -l 27
ruby ../../../.rvm/gems/ruby-2.4.1/gems/minitest-spec-rails-5.4.0/lib/minitest-spec-rails/dsl.rb -l 27
```

Here we should actually be seeing the test location and line number, not that of the gem :D