Test rolling back to a good version too

test/cli/main_test.rb

@@ -15,6 +15,17 @@ class CliMainTest < CliTestCase
     end
   end
 
+  test "rollback good version" do
+    Mrsk::Cli::Main.any_instance.stubs(:container_name_available?).returns(true)
+
+    run_command("rollback", "123").tap do |output|
+      assert_match /Stop current version, then start version 123/, output
+      assert_match /docker ps -q --filter label=service=app | xargs docker stop/, output
+      assert_match /docker start app-123/, output
+    end
+  end
+
+
   private
     def run_command(*command)
       stdouted { Mrsk::Cli::Main.start([*command, "-c", "test/fixtures/deploy_with_accessories.yml"]) }