These days, it's becoming increasingly harder to find web applications that are homogenous in terms of the tools they use to Get Things Done. [...] Loosely coupled components, passing messages to each other, is great architecture to try and build if you have both the skills and patience to make it work.

His technique combines the testing of PHPUnit for PHP with the Py.test functionality for Python with the continuous integration tool Hudson to run them both as a part of the same build process.