simplecov

https://github.com/simplecov-ruby/simplecov

Ruby

Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites

Order#subtotal

No Docs, write some!

Source | Google | Stack overflow

Edit

git clone [email protected]:simplecov-ruby/simplecov.git
cd simplecov
open test_projects/rails/minitest_rails/app/models/order.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Order-subtotal-for-pr

# Commit to git
git add test_projects/rails/minitest_rails/app/models/order.rbgit commit -m "better docs for Order#subtotal"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Order-subtotal-for-pr
hub pull-request

# Celebrate!