Allows you to focus on a few tests with ease without having to use command-line arguments. Good for tools like guard that don't have enough brains to understand test output. Cf. ZenTest's autotest (an example of a test runner with strong testing logic). Inspired by https://github.com/seattlerb/minitest/issues/213
Gemfile gem 'minitest-focus', '~> 1.1.0'
install gem install minitest-focus