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Several times recently, I have been asked how to develop a Rails application using the Test Driven Development approach. I'm not an expert here, but I've put together some notes on how to start working on a Rails application whilst being test-driven all the time. As an example I will use a word-learning web application. The simplest use case is to display a random word object (with its polish translation) from the database. Every time we refresh we want to see a different word.