Add coverage

gemfiles/rails2.gemfile

@@ -3,4 +3,5 @@ gemspec :path => "../"
 
 group :development, :test do
   gem 'rails', '~> 2.0'
+  gem 'mime-types', '< 2.0', :platforms => :ruby_18
 end

spawnling.gemspec

@@ -26,5 +26,6 @@ threads (see lib/patches.rb).}
   s.add_development_dependency 'bundler'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
+  s.add_development_dependency 'coveralls'
   s.add_development_dependency 'rails'
 end

spec/spec_helper.rb

@@ -4,6 +4,29 @@
 
 $:.unshift(File.join(File.dirname(__FILE__), %w[.. lib]))
 
+MINIMUM_COVERAGE = 28
+
+if ENV['COVERAGE']
+  require 'simplecov'
+  require 'coveralls'
+  Coveralls.wear!
+
+  SimpleCov.formatter = Coveralls::SimpleCov::Formatter
+  SimpleCov.start do
+    add_filter '/vendor/'
+    add_filter '/spec/'
+    add_group 'lib', 'lib'
+  end
+  SimpleCov.at_exit do
+    SimpleCov.result.format!
+    percent = SimpleCov.result.covered_percent
+    unless percent >= MINIMUM_COVERAGE
+      puts "Coverage must be above #{MINIMUM_COVERAGE}%. It is #{"%.2f" % percent}%"
+      Kernel.exit(1)
+    end
+  end
+end
+
 require 'spawnling'
 Spec::Runner.configure do |config|