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Title: Testing Extreme Programming by Lisa Crispin, Tip House ISBN: 0-321-11355-1 Publisher: Addison-Wesley Pub Co Pub. Date: 25 October, 2002 Format: Paperback Volumes: 1 List Price(USD): $34.99 |
Average Customer Rating: 4.25 (4 reviews)
Rating: 4
Summary: Resolution of an apparent contradiction about testing
Comment: While I yield to no one in recognizing the value of testing software, my first reaction to reading the title of this book was one of skepticism. One of the fundamental principles of extreme programming (XP), is that the software is developed in small increments, each of which must pass a unit test before the next change is made. In fact, in many cases the unit test is written by the developers before they write the code. These incremental tests are also carried out by the two-person coding team, so it seemed strange to be reading about testing XP. From the title and blurbs on the covers, it was a natural assumption that the focus would be on testing other than that done by the development teams.
After reading the book, that skepticism has largely gone, although I do possess some residual doubts about XP and how it scales. The basic point is that programmers are very good at testing their code at the unit level, but weak when asked to verify it at the system level. I agree with the authors that there should be a dedicated tester who examines the code at a level higher than the unit. However, I am also of the opinion that this is a confirmation of the doubt about XP expressed by so many observers, namely that it does not scale up to large projects well. The testers that they are proposing are more in the realm of a manager responsible for testing rather than a tester.
This is of course very sensible. Once the programmers start producing code tested at the unit level and the integration process begins, someone must be responsible for the smooth flow and testing of the integration. This is also the level where the ever-present customer, another fundamental principle of XP, really sees the functionality of the code for the first time. While XP proponents speak a great deal about having the customer at the side of the coding team, realism dictates that they will generally be restricted from that level. Only the most technically sophisticated customer will be able to glean any useful information from most of the unit tests that will be performed. This is where the additional layer of the test manager is of use. By creating and demonstrating the higher level tests, the test manager can give the customer information that they will understand and can respond to.
The authors also put forward a very controversial statement, "No manual tests. All acceptance tests on an Extreme Programming project must be automated." While I am in general agreement with the principle that tests should be automated for easy repetition at each level, the reality is that nearly every use of words such as { "no", "never", "all"} is too extreme. Especially when you are describing something as subjective as the behavior of computer programs and the human response to them. How one can automate the response of a customer to the appearance of a GUI interface is something I do not yet understand, and this is mentioned, but not examined in the book.
One very positive aspect of the book is the exercises at the end of the chapters, and the authors do the very commendable thing and provide solutions at the end. After years of frustration with math and computer books that list exercises but avoid solutions, any book where they are included must be given a higher rating.
After reading this book, my confidence in the value of XP has increased, ironically because one of the fundamental weaknesses is examined with an explanation of how to overcome it. The uber-tester is a concession to the problems of scaling, and the inclusion of such individuals will definitely make the development process run smoother. If you are going to use XP and your project is of any size, then you should read this book.
Published in the online Journal of Object Technology, reprinted with permission.
Rating: 5
Summary: Rave Review for "Testing Extreme Programming"
Comment: What a great book on Testing in the Xtreme Programming Environment! I expect this book to become the Bible for test engineers and customers who are engaged in formal testing on an Xtreme Programming project. Lisa and Tip walk us through some introductory theory, and then provide a detailed case-study to illustrate their methods. Though appearing somewhat complex to a non-programmer, their chapters 21 through 25 show the important principles of how to automate your acceptance test.
Though I haven't yet had the experience of working on an Xtreme Programming project, I do have 30 years of hardware, systems, and software testing experience. Prior to reading this book, I read Kent Beck's "eXtreme Programming eXplained", so I had an introduction to Xtreme Programming.
Once again, this is a great book. My welcome to 2 new authors; I hope we see more books from them in the future.
Rating: 3
Summary: Extreme programming from the tester's perspective
Comment: This book is a professional tester's perspective of being involved into an XP project. The book will invigorate the testers who never worked in XP environment to start doing this practice. The book starts with an introductory overview on XP, which is self-contained and should be easily understood by any tester, unless he or she has prejudices against XP. This introduction is helpful for those who inherently would like to use XP. The skeptical readers should first take attention to Kent Beck's "Extreme Programming Explained".
For those who don't like to imagine of someone in the tester "role" on an XP project, the authors encourage to think of having a programmer with a "tester focus". The authors define the tester role to fill the communication gap between the user and the programmers.
For those who are already practicing XP, this book should be a good repetition of the core XP practices. If you like to refresh in memory the essential aspects of XP, read this book. The authors give their own vantage point on XP, which compliments the original Kent Beck's idea.
This book also contains the introduction to some automated test tools like JUnit (a testing framework for Java) or JWebArt (an HTTP-based web testing tool). However, the JUnit introduction given in this book won't help great deal to the C++ programmers, because the CppUnit, the C++ testing framework, have sufficient differences from JUnit. What the XP community who work with C++ really miss at the date of publication of this book is a good CppUnit manual.
The book also have essential focus on story estimation and iteration planning, from the tester's perspective. However, from the programmer's point of view, this book contain very few useful ideas. The programmers might want to refer to Ron Jeffries' "Extreme Programming Installed" for some useful testing strategies, tips and tricks.
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Title: Test Driven Development: By Example by Kent Beck ISBN: 0321146530 Publisher: Addison-Wesley Pub Co Pub. Date: 08 November, 2002 List Price(USD): $29.99 |
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Title: Extreme Programming Explained: Embrace Change by Kent Beck ISBN: 0201616416 Publisher: Addison-Wesley Pub Co Pub. Date: 05 October, 1999 List Price(USD): $28.95 |
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Title: Planning Extreme Programming by Kent Beck, Martin Fowler ISBN: 0201710919 Publisher: Addison-Wesley Pub Co Pub. Date: 13 October, 2000 List Price(USD): $45.99 |
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Title: Extreme Programming Applied: Playing to Win by Ken Auer, Roy Miller ISBN: 0201616408 Publisher: Addison-Wesley Pub Co Pub. Date: 01 October, 2001 List Price(USD): $36.99 |
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Title: Extreme Programming Installed by Ron Jeffries, Ann Anderson, Chet Hendrickson ISBN: 0201708426 Publisher: Addison-Wesley Pub Co Pub. Date: 13 October, 2000 List Price(USD): $29.95 |
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