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Test Driven Development: By Example
Download Test Driven Development: By Example
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From the Back Cover
Clean code that works--now. This is the seeming contradiction that lies behind much of the pain of programming. Test-driven development replies to this contradiction with a paradox--test the program before you write it. A new idea? Not at all. Since the dawn of computing, programmers have been specifying the inputs and outputs before programming precisely. Test-driven development takes this age-old idea, mixes it with modern languages and programming environments, and cooks up a tasty stew guaranteed to satisfy your appetite for clean code that works--now. Developers face complex programming challenges every day, yet they are not always readily prepared to determine the best solution. More often than not, such difficult projects generate a great deal of stress and bad code. To garner the strength and courage needed to surmount seemingly Herculean tasks, programmers should look to test-driven development (TDD), a proven set of techniques that encourage simple designs and test suites that inspire confidence. By driving development with automated tests and then eliminating duplication, any developer can write reliable, bug-free code no matter what its level of complexity. Moreover, TDD encourages programmers to learn quickly, communicate more clearly, and seek out constructive feedback. Readers will learn to: Solve complicated tasks, beginning with the simple and proceeding to the more complex. Write automated tests before coding. Grow a design organically by refactoring to add design decisions one at a time. Create tests for more complicated logic, including reflection and exceptions. Use patterns to decide what tests to write. Create tests using xUnit, the architecture at the heart of many programmer-oriented testing tools. This book follows two TDD projects from start to finish, illustrating techniques programmers can use to easily and dramatically increase the quality of their work. The examples are followed by references to the featured TDD patterns and refactorings. With its emphasis on agile methods and fast development strategies, Test-Driven Development is sure to inspire readers to embrace these under-utilized but powerful techniques. 0321146530B10172002
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About the Author
Kent Beck consistently challenges software engineering dogma, promoting ideas like patterns, test-driven development, and Extreme Programming. Currently affiliated with Three Rivers Institute and Agitar Software, he is the author of many Addison-Wesley titles.
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Product details
Paperback: 240 pages
Publisher: Addison-Wesley Professional; 1 edition (November 18, 2002)
Language: English
ISBN-10: 9780321146533
ISBN-13: 978-0321146533
ASIN: 0321146530
Product Dimensions:
7.3 x 0.8 x 9.2 inches
Shipping Weight: 1.6 pounds (View shipping rates and policies)
Average Customer Review:
4.0 out of 5 stars
76 customer reviews
Amazon Best Sellers Rank:
#28,988 in Books (See Top 100 in Books)
Let me say first off that I agree with much that Kent Beck has to say: 1. Testing should be done along with the coding. 2. Use regression tests to be confident of making changes. 3. In many ways testing can be used as documentation since it is much more definitive than specification documents. 4. Testing should be used to have the client sign off on a product. In reading the book I learned the specifics of how tests are designed in TDD. It seems reasonable and I am going to make a conscious effort at designing my tests in the way suggested.Where I disagree is in the use of the tests to drive software design. In the first part of the book, which I think is the most important part, a very good coding problem is analyzed - it is realistic, limited in scope and far from trivial. I followed along until I reached a point where things stopped making sense. I skipped ahead to see where things were headed and then things became clear.What is being advocated is a type of bottom up design approach. This may work for some. It may even be that the book faithfully reproduced Beck's reasoning process. It does not work for me. I first have to see the larger picture, what he refers to as the "metaphor." The whole thing would have been much clearer to me if at the beginning I was told that one approach to summing money in different currencies would be to use an array to store the information but that instead the implementation would create a list similar to how things are done in LISP.I urge the reader to judge for him/herself. Like I said this is a good example to go through. I even learned some things about more advanced uses of object oriented programming. As for software design I am going to stick with dataflow diagrams. They are still the best tool that I know of for putting together software, UML notwithstanding.
Kent Beck is one of my favorite authors. Learning and becoming proficient at TDD requires a shift in how software development is approached. Lots of people who have been doing TDD for quite a while make it seem like a trivial task to utilize, but for beginners who wonder how in the heck you start with a test it's not so easy. This book goes a long way to providing real world examples as well as demonstrates how to utilize TDD and will help anyone looking to wrap their brain around the TDD approach of software development.
While the first two parts of the book: "The Money Example" and "The xUnit Example" may seem discontenting for an experienced XP'er, the third part: "Patterns for Test-Driven Development" is amazingly impressive. It brings lot of valuable patterns: Test-Driven Development Patterns, Red Bar Patterns, Testing Patterns, Green Bar Patterns, xUnit Patterns and Design Patterns. Despite the book "Design Patterns" seems to be provisioning, design in test-driven-development requires a slightly different look at design patterns, and Kent Beck has done his best in providing not only the common vocabulary, but a gainful technique not known to be described anywhere else before.Before the publication of this book, there was a lack of a good manual for xUnit testing framework. The title "Testing Extreme Programming" by Lisa Crispin and Tip House, released a couple of month before this book, didn't fill the gap. This book is the first significant guidebook for xUnit ever released. While the work "Extreme Programming Installed" exposes most valuable testing experience among other XP titles, it didn't focus on xUnit as well.I would recommend "Design Pattern" and "Refactoring" in addition to this book, assuming that you are aware of the XP manifesto: "Extreme Programming Explained".
This is book is a necessary read for anyone who wants to ensure changes/bugfixes don't break what ain't broken. Well written and concepts clearly demonstrated. Overall it is a great read that will help you write understandable, extensible and maintainable code.
This is the most helpful book I've read so far on getting you familiar with testing. You get walked through creating a currency model using TDD and then walk through creating your own TDD framework using TDD so that you never have to be without it.
Mr Beck is my hero. This book is short and focused. It presents a pretty simple and seemingly silly process of writing the tests before the code that implements it. The way he does it is where the magic is. Its simple, humorous, and surprisingly humble. He presents a few simple but non trivial coding problems and the TDD process which leads to the solution. His humility is so strong its hard to believe he's the master craftsman that he is. I think any serious software developer that hasn't read this book and spent time with this approach is missing out. I considered myself a great developer before I read this book and it changed everything for me. Maybe I wasn't a great developer or maybe I got even better, hard to say. I recommend it 100%
This book is a must have if you really want to dig into the practice of TDD. Kent Beck describes how you should begin, how to step through tests and production code and comes with handy examples.The book begins with a full example of how to create and evolve software completely test driven. You'll learn how to write the tests, how to fill leaps if you don't have any clue how to write the next test on the list with intermediate tests and you see, how easy design decisions can be applied or reverted if necessary.At the end of the book there is also a discussion about what TDD is all about, how you can apply it to your own skills/practices and what you have to look for when applying it onto new but also existing applications.I liked reading it very much.
Excellent book!
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