--- /dev/null
+
+# Run tests against all Rails versions
+
+VENDOR_DIR = File.expand_path("~/Desktop/projects/vendor/rails")
+
+HERE = File.expand_path(File.dirname(__FILE__))
+
+Dir["#{VENDOR_DIR}/*"].each do |dir|
+ puts "\n\n**** #{dir} ****\n\n"
+ Dir.chdir "#{HERE}/integration/app/vendor" do
+ system("rm rails; ln -s #{dir} rails")
+ end
+ system("ruby #{HERE}/unit/polymorph_test.rb")
+end
+
+system("rm #{HERE}/integration/app/vendor; svn up #{HERE}/integration/app/vendor")