[UIAutomation] Run tests on all available iOS SDKs.

test/bacon-ui/Rakefile

@@ -5,6 +5,29 @@ require 'motion/project/template/ios'
 Motion::Project::App.setup do |app|
   # Use `rake config' to see complete project settings.
   app.name = 'MacBacon UI'
-  app.sdk_version = '6.1'
   app.frameworks << 'CoreGraphics'
+  app.deployment_target = ENV['deployment_target'] if ENV['deployment_target']
+end
+
+namespace :spec do
+  desc "Run on all available iOS SDKs"
+  task :all do
+    sdk_versions = Dir.glob(File.join(App.config.platforms_dir, "#{App.config.deploy_platform}.platform/Developer/SDKs/#{App.config.deploy_platform}*.sdk")).map do |path|
+      File.basename(path).scan(/#{App.config.deploy_platform}(.*)\.sdk/)[0][0]
+    end
+    counter = 0
+    sdk_versions.each do |sdk_version|
+      App.info "Info", "Running specs on iOS #{sdk_version} SDK."
+      sh "rake clean"
+      begin
+        sh "rake spec deployment_target=#{sdk_version}"
+      rescue RuntimeError
+        counter += $?.exitstatus
+      end
+    end
+    if counter > 0
+      App.info "Failed", "A total of #{counter} failures occurred."
+      exit counter
+    end
+  end
 end