Shoulda and rcov the right way

rcov.rake

# 
# Original blog here http://honoluluhacker.com/2009/11/19/install-shoulda-and-rcov-the-right-way/
# Update your test/test_helper.rb, add
#   require 'shoulda/rails'
# 
require File.expand_path(File.dirname(__FILE__) + "/../../config/boot")
require 'rake'
require 'rake/testtask'
require 'rake/rdoctask'
require 'tasks/rails'
require 'shoulda/tasks'
 
def run_coverage(files)
  rm_f "coverage"
  rm_f "coverage.data"
 
  # turn the files we want to run into a  string
  if files.length == 0
    puts "No files were specified for testing"
    return
  end
 
  files = files.join(" ")
 
  if PLATFORM =~ /darwin/
    exclude = '--exclude "gems/*"'
  else
    exclude = '--exclude "rubygems/*"'
  end
 
  rcov = "rcov --rails -Ilib:test --sort coverage --text-report #{exclude}  --aggregate coverage.data"
  cmd = "#{rcov} #{files}"
  puts cmd
  sh cmd
end
namespace :test do
 
  desc "Measures unit, functional, and integration test coverage"
  task :coverage do
    run_coverage Dir["test/**/*.rb"]
  end
 
  namespace :coverage do
    desc "Runs coverage on unit tests"
    task :units do
      run_coverage Dir["test/unit/**/*.rb"]
    end
    desc "Runs coverage on functional tests"
    task :functionals do
      run_coverage Dir["test/functional/**/*.rb"]
    end
    desc "Runs coverage on integration tests"
    task :integration do
      run_coverage Dir["test/integration/**/*.rb"]
    end
  end
end