Modern C++ Programming with Test-Driven Development

A2.3 Practice Makes Perfect

If you haven’t already, you should follow the exact steps detailed in this appendix to build the Roman numeral converter. Don’t stop there, however. Implement the converter a second time, ​without​ referring to this book. Think about what the next step should be, build a test, find a simple way to implement it, and refactor your code. Then do it again—maybe not immediately, but perhaps the next day or a week later. Time yourself with each run through the kata, seeking to minimize the keystrokes and effort required to derive a complete solution. If you’ve been away from TDD or C++ for a while, use it as a warm-up exercise.