test-with watches your current directory and runs the command you specify every time something is changed. I find it valuable because...
test-with truffle test will display real-time results of your Ethereum app test suite
test-with rails test will display real-time results of your Rails app test suite
test-with rails test test/controllers will display real-time results of your controllers tests
test-with ruby letter_test.rb will display real-time results of the Ruby test file
test-with python tests.py will display real-time results of the Python test file
test-with git status will display real-time list of changes in the directory
Run in your terminal
gem install test_with
See above, the very top.
The gem is available as open source under the terms of the MIT License.