Download Effective Unit Testing by Lasse Koskela PDF

By Lasse Koskela

Potent Unit checking out teaches Java builders the right way to write unit exams which are concise, expressive, worthwhile, and maintainable. delivering crisp reasons and easy-to-absorb examples, it introduces rising ideas like behavior-driven improvement and specification through example.

Programmers who're already unit checking out will examine the present cutting-edge. people who find themselves new to the sport will research practices that might serve them good for the remainder of their occupation.

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Example text

In my consulting work I’ve noticed that most programmers agree they should write some tests. Similarly, I’ve noticed that few programmers hold the opinion that they should aim for a 100% code coverage—meaning that their tests exercise every possible execution path through the production code. So what can we make of this? We agree that writing some tests is a no-brainer, but our certainty decreases as we get closer to full code coverage—we’ve written tests for pretty much everything and the remaining code without any tests is almost too trivial to break.

2, because you’re making a change in how mailing addresses are represented internally in the application and you mess up something while you’re at it. There’s a bug. What happens next? I’d imagine it’s going to take a while to pinpoint the exact place in the test code where your programming error manifests itself. There’s no structure in the test code to help you see what affects what, where a certain object is instantiated, what the value of a given variable is at the point where things fall apart, and so forth.

Info The value of having tests 9 The rising cost of fixing a bug What do you think fixing a bug would cost on average? At the XP Day 2009 conference in London, Google’s Mark Striebeck reported on Google’s estimates around the cost of delay in fixing defects. Google had estimated that it cost $5 to fix a bug immediately after a programmer had introduced it. Fixing the same defect would cost $50 if it escaped the programmer’s eyes and was found only after running a full build of the project. The cost surged to $500 if it was found during an integration test, and to $5000 if it managed to find its way to a system test.

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