Acceptance testing a CherryPy application with Robot Framework

I recently received the Python Testing Cookbook authored by Greg L. Turnquist and was happy to read about recipes on acceptance testing using Robot Framework. We’ve been using this tool at work for a few weeks now with great results. Greg shows how to test a web application using the Selenium Library extension for Robot Framework and I thought it’d be fun to demonstrate how to test a CherryPy application following his recipe. So here we go.

First some requirements:

Let’s define a simple CherryPy application, which displays a input text where to type a message. When the submit button is pressed, the message is sent to the server and returned as-is. Well it’s an echo message really.

Save the code above in a module named myapp.py

Next, we create an extension to Robot Framework that will manage CherryPy. Save the following in a module CherryPyLib.py. It’s important to respect that name since Robot Framework expects the module and its class to match in names.

Note that we start and stop the CherryPy server during the test itself, meaning you don’t need to start it separately. Pure awesomeness.

Finally let’s write a straightforward acceptance test to validate the overall workflow of echoing a message using our little application.

Save the test above into a file named testmyapp.txt. You can finally run the test as follow:

This will start CherryPy, Selenium’s proxy server and Firefox within which the test case will be run. Easy, elegant and powerful.