https://github.com/simplecov-ruby/simplecov
Ruby code coverage
[test|spec]_helper.rb
require 'simplecov'
SimpleCov.start do
enable_coverage :branch
add_filter '/app/admin/' # example: config for an admin UI that is just declaration
add_filter '/config/'
add_filter '/test/'
end
Run tests, then view coverage/index.html
in browser