Rcov rake task

gistfile1.rb

namespace :test do
  desc "Generate code coverage with rcov"
  task :coverage do
    rm_rf "doc/coverage/coverage.data"
    rm_rf "doc/coverage"
    mkdir "doc/coverage"
    rcov = %(rcov --rails --aggregate doc/coverage/coverage.data --exclude gems --text-summary -Ilib:test --html -o doc/coverage test/**/*_test.rb)
    system rcov
    system "open doc/coverage/index.html" if PLATFORM['darwin']
  end
end

There seems to be a lack of working rcov rake tasks out there, so I though I would share mine.