Rake tasks for running your Rails tests with Rcov

coverage.rake

# modified from original by Tim Su at http://www.betaful.com/2010/11/rails-3-rcov-test-coverage/

# place this in lib/tasks/

namespace :coverage do
 
  task :clean do
    rm_rf "test/coverage"
    rm_f "test/coverage.data"
    Rcov = "rcov --rails --aggregate coverage.data -Ilib \
                   --text-summary -x 'bundler/*,gems/*'"
  end
 
  def display_coverage
    system("sensible-browser test/coverage/index.html")
  end
 
  desc 'Measures unit test coverage'
  task :unit => :clean do
    system("cd test && find unit -name \*test.rb -print0 | xargs -0 #{Rcov} --html")
    display_coverage
  end
 
  desc 'Measures functional test coverage'
  task :functional => :clean do
    system("cd test && find functional -name \*test.rb -print0 | xargs -0 #{Rcov} --html")
    display_coverage
  end
  
  desc 'Measures integration test coverage'
  task :integration => :clean do
    system("cd test && find integration -name \*test.rb -print0 | xargs -0 #{Rcov} --html")
    display_coverage
  end
 
  desc 'All unit test coverage'
  task :all => :clean do
    system("cd test && find -name \*test.rb -print0 | xargs -0 #{Rcov} --html")
    display_coverage
  end
 
end
 
task :coverage do
  Rake::Task["coverage:all"].invoke
end