Chapter 13Adding Tests to a Legacy Application

In the real world, you don’t always get the luxury of working on shiny new code. Reading a book like this can be a little bit frustrating because the examples all deal with nice, simple problems, usually in a new codebase.

We all know that software development isn’t really like that.

Even in the best teams we’ve worked on, there have always been a few dark and ugly corners of the codebase where nobody really wanted to go. People would sometimes disappear into there for days at a time and emerge exhausted and confused, blinking in the bright sunlight.

Like an old abandoned mine, those areas of the codebase are dangerous. The code is fragile, and the slightest change can cause other parts of ...

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