RCov w/ RSpec-2

So I've spend the last couple weeks updating an old Rails application to Rails 3 and RSpec 2, both of which are currently still in beta.

Early on I noticed that the new rspec doesn't quite support rake spec:rcov yet. The new core framework has the rcov flag but there's no default rake task. RSpec-rails also removed the spec.rake task from your rails project and centralized it into your gem install, which confused me to no end. So in case anyone else wants to run rcov on your code I thought I might post what I did to make rake spec:rcov work again.

First a couple prereqs. I'm using an RVM install of all of this with ruby 1.8.7 (only because 1.9.1 gave me problems w/ rails 3) so in the steps below replace the paths I give with the path to your gem installation folder and you should be good.

1) Open ~/.rvm/rubies//lib/ruby/gems//gems/rspec-rails-2.XXXXX/lib/rspec/rails/tasks/rspec.task in your favorite editor.

2) Add this rake task

desc "Run all specs with rcov"
RSpec::Core::RakeTask.new(:rcov => spec_prereq) do |t|
t.rcov = true
end

That's it. Pretty simple.

A caveat. Right now this runs ALL of your specs in both your rvm ruby folder and your project. I haven't a clue why, hopefully someone smarter than I will comment. That means rcov take a while and when its done its cludgy. If someone does help me out I'll post an update, in the meantime this works.