Working Effectively with Legacy Code

Chapter 6: I Don’t Have Much Time and I Have to Change It

Let’s face facts: The book you are reading right now describes additional work—work that you probably aren’t doing now and work that could make it take longer to finish some change you are about to make in your code. You might be wondering whether it’s worth doing these things right now.

The truth is, the work that you do to break dependencies and write tests for your changes is going to take some time, but in most cases, you are going to end up saving time—and a lot of frustration. When? Well, it depends on the project. In some cases, you might write tests for some code that you need to change, and it takes you two hours to do that. The change that you make afterward might take 15 minutes. ...