Preface
The Value of Self-Testing Code
In Chapter 4 of Refactoring [Ref], Martin Fowler writes:
If you look at how most programmers spend their time, you'll find that writing code is actually a small fraction. Some time is spent figuring out what ought to be going on, some time is spent designing, but most time is spent debugging. I'm sure every reader can remember long hours of debugging, often long into the night. Every programmer can tell a story of a bug that took a whole day (or more) to find. Fixing the bug is usually pretty quick, but finding it is a nightmare. And then when you do fix a bug, there's always a chance that anther one will appear and that you might not even notice it until much later. Then you spend ages finding that bug. ...
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