Using Rcov to measure the test coverage of Rails plugins

Posted by jamie Fri, 24 Aug 2007 18:43:00 GMT

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.

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  1. Avatar online said 5 months later:

    Puh, I should have had a look before. Drove me crazy but thanks to this article I solved the problem. Thanks!

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