This just might be the thing that brings a mathematical rigor to Test Driven Development (TDD). If nothing else, it will certainly help programmers choose which tests to write next, and how best to make them pass. Transformations are like refactorings in that they are simple incremental changes to code.

This article proposes strategies to refactor problematic PHP code, making it easier to test it with unit testing tools, while reducing dependencies that improves your code base.

Testing is a fundamental part of the Agile process. We live and breathe TDD/BDD. Red/Green/Refactor is our daily mantra. We love cucumber and writing executable, customer readable specifications. We even write tests for our JavaScripts.

“Bug fixing often uncovers opportunities for refactoring. The very fact that you’re working with code that contains a bug indicates that there is a chance that it could be clearer or better structured.”