Added 'rake coverage' for an rcov report

.gitignore

@@ -1,2 +1,3 @@
 test/rails_root/log/*.log
 doc
+coverage

Rakefile

@@ -3,10 +3,10 @@ require 'rake/testtask'
 require 'rake/rdoctask'
 
 # Test::Unit::UI::VERBOSE
-
+test_files_pattern = 'test/{unit,functional,other}/**/*_test.rb'
 Rake::TestTask.new do |t|
   t.libs << 'lib'
-  t.pattern = 'test/{unit,functional,other}/**/*_test.rb'
+  t.pattern = test_files_pattern
   t.verbose = false
 end
 
@@ -18,6 +18,13 @@ Rake::RDocTask.new { |rdoc|
   rdoc.rdoc_files.include('README.rdoc', 'CONTRIBUTION_GUIDELINES.rdoc', 'lib/**/*.rb')
 }
 
+desc "Run code-coverage analysis using rcov"
+task :coverage do
+  rm_rf "coverage"
+  files = Dir[test_files_pattern]
+  system "rcov --rails --sort coverage -Ilib #{files.join(' ')}"
+end
+
 desc 'Update documentation on website'
 task :sync_docs => 'rdoc' do
   `rsync -ave ssh doc/ [email protected]:/home/dev/www/dev.thoughtbot.com/shoulda`