rake test:coverage

test.rake

namespace :test do
  RCOV = "rcov --rails --aggregate coverage.data --text-summary -Ilib"
  
  def rcov_on(files_selector)
    unless Dir[files_selector].size == 0
      system("#{RCOV} --html #{files_selector}") 
    end
  end

  desc 'Measures test coverage'
  task :coverage do
    rm_f "coverage"
    rm_f "coverage.data"
    rcov_on('test/unit/*_test.rb')
    rcov_on('test/functional/*_test.rb')
    rcov_on('test/integration/*_test.rb')
    system("open coverage/index.html") if PLATFORM['darwin']
  end
end