diff --git a/lib/tasks/testing.rake b/lib/tasks/testing.rake
index b9e2283af..4e944e1d9 100644
--- a/lib/tasks/testing.rake
+++ b/lib/tasks/testing.rake
@@ -1,6 +1,17 @@
 ### From http://svn.geekdaily.org/public/rails/plugins/generally_useful/tasks/coverage_via_rcov.rake
 
 namespace :test do
+  desc 'Measures test coverage'
+  task :coverage do
+    rm_f "coverage"
+    rm_f "coverage.data"
+    rcov = "rcov --rails --aggregate coverage.data --text-summary -Ilib"
+    system("#{rcov} --no-html test/unit/*_test.rb")
+    system("#{rcov} --no-html test/functional/*_test.rb")
+    system("#{rcov} --html test/integration/*_test.rb")
+    system("open coverage/index.html") if PLATFORM['darwin']
+  end
+
   namespace :scm do
     namespace :setup do
       desc "Creates directory for test repositories"