This post originated from an RSS feed registered with Ruby Buzz by Jamie Hill. Original Post: Using Rcov to measure the test coverage of Rails plugins Feed Title: The Lucid Feed URL: http://feeds.feedburner.com/thelucid Feed Description: Lightweight ramblings and tips on Ruby and Rails. Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Jamie Hill Latest Posts From The Lucid

To view the coverage of your plugins using Rcov, first install the rcov gem with sudo gem install rcov, then copy and paste the following onto the end of the Rakefile inside your plugin directory:

desc 'Measures test coverage using rcov'
task :rcov do
  rm_f "coverage"
  rm_f "coverage.data"
  rcov = "rcov --rails --aggregate coverage.data --text-summary -Ilib"
  system("#{rcov} --html #{Dir.glob('test/**/*_test.rb').join(' ')}")
  system("open coverage/index.html") if PLATFORM['darwin']
end

You can now simply run rake rcov from inside your plugin directory which will generate a coverage directory with the results. Open coverage/index.html (if you are on OSX this will open automatically) in a browser to view the results.

Thanks to Mike Clark for his Rcov rake task for Rails which this task is based on.