added ginger scenarios to run specs against all supported rails versions

spec/ginger_scenarios.rb

@@ -0,0 +1,19 @@
+# For use with the ginger gem to test plugin against multiple versions of Rails.
+#
+# To use ginger:
+#    
+#    sudo gem install freelancing-god-ginger --source=http://gems.github.com
+#
+# Then run
+#
+#   ginger spec
+#
+Ginger.configure do |config|
+  rails_versions = ['2.0.2', '2.1.2', '2.2.2']
+
+  rails_versions.each do |v|
+    g = Ginger::Scenario.new
+    g['rails'] = v
+    config.scenarios << g.dup
+  end
+end

spec/spec_helper.rb

@@ -12,7 +12,11 @@ vendored_rails = File.dirname(__FILE__) + '/../../../../vendor/rails'
 if vendored = File.exists?(vendored_rails)
   Dir.glob(vendored_rails + "/**/lib").each { |dir| $:.unshift dir }
 else
-  gem 'rails', "=#{ENV['VERSION']}" if ENV['VERSION']
+  begin
+   require 'ginger' 
+  rescue LoadError
+  end
+  gem 'rails'
 end
 
 RAILS_ROOT = File.dirname(__FILE__)