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I developed software for 12 years in a "testing-by-use-cases" company. Over 50% of the bugs coming out of our system tests were unit test problems! Argh! I can't wait to start using the great stuff in this book. An example: a table in Chapter 8 lists the various UML diagrams and how they can be related to test design patterns.
If you play any role in the development of OO software, you need this book. And if Chapter 4, which points out exactly the problems that come with OO software and how to make the necessary changes to manage them, and section 2.3 "FAQs for Object-oriented Testing" do not convince you to take a new look at your approach to testing, you are probably beyond hope. A spot has already been reserved on my bookshelf for the promised companion volume.
Object-oriented languages, while recognised as a clear forward step in programming technology, introduce new ways for defects to be introduced. Inheritance and polymorphism both are powerful concepts, but also carry the potential for insidious defects. This book introduces fundamental techniques to analyse the class design and derive appropriate tests for its behaviour.
I regard Bob's book as a must for developers. However I wonder if they will read it. This is not a criticism on this book, quite the contrary. My concern is related to the insight that most programmers see unit testing as an afterthought and not as a major component of their work. Often unit testing is seen as difficult, because of the complexities of class behaviour. And it is so easy to pass this burden on to system testing.
My message for developers is, make the attempt to read it! It actually makes it easier to design and implement unit testing. It also pays off. You will have less requests for bugfixes coming back from testing.
It has been long my contention that it is in the interest of the testing community to get out of its own trenches and start working closely with developers, making it easy for them to implement effective unit testing. This book is a good start in this direction.
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