Ruby gem to locally test only modified files.

Add this line to your application's Gemfile:

gem 'testdiff'

And then execute:

bundle

Or install it yourself as:

gem install testdiff

Run Rubocop and Rspec on all modified files:

testdiff

Run Rubocop on all modified files:

testdiff rubocop

Run Rspec on all modified files:

testdiff rspec