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xUnit Test Patterns: Refactoring Test Code Hardcover – May 31, 2007

24 customer reviews
ISBN-13: 978-0131495050 ISBN-10: 0131495054

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Editorial Reviews

From the Back Cover

Automated testing is a cornerstone of agile development. An effective testing strategy will deliver new functionality more aggressively, accelerate user feedback, and improve quality. However, for many developers, creating effective automated tests is a unique and unfamiliar challenge.

xUnit Test Patternsis the definitive guide to writing automated tests using xUnit, the most popular unit testing framework in use today. Agile coach and test automation expert Gerard Meszaros describes 68 proven patterns for making tests easier to write, understand, and maintain. He then shows you how to make them more robust and repeatable--and far more cost-effective.

Loaded with information, this book feels like three books in one. The first part is a detailed tutorial on test automation that covers everything from test strategy to in-depth test coding. The second part, a catalog of 18 frequently encountered "test smells," provides trouble-shooting guidelines to help you determine the root cause of problems and the most applicable patterns. The third part contains detailed descriptions of each pattern, including refactoring instructions illustrated by extensive code samples in multiple programming languages.

Topics covered include

  • Writing better tests--and writing them faster
  • The four phases of automated tests: fixture setup, exercising the system under test, result verification, and fixture teardown
  • Improving test coverage by isolating software from its environment using Test Stubs and Mock Objects
  • Designing software for greater testability
  • Using test "smells" (including code smells, behavior smells, and project smells) to spot problems and know when and how to eliminate them
  • Refactoring tests for greater simplicity, robustness, and execution speed

This book will benefit developers, managers, and testers working with any agile or conventional development process, whether doing test-driven development or writing the tests last. While the patterns and smells are especially applicable to all members of the xUnit family, they also apply to next-generation behavior-driven development frameworks such as RSpec and JBehave and to other kinds of test automation tools, including recorded test tools and data-driven test tools such as Fit and FitNesse.


Visual Summary of the Pattern Language 
Foreword

Preface

Acknowledgments

Introduction

Refactoring a Test

PART I: The Narratives
Chapter 1 A Brief Tour
Chapter 2 Test Smells
Chapter 3 Goals of Test Automation
Chapter 4 Philosophy of Test Automation
Chapter 5 Principles of Test Automation
Chapter 6 Test Automation Strategy
Chapter 7 xUnit Basics
Chapter 8 Transient Fixture Management
Chapter 9 Persistent Fixture Management
Chapter 10 Result Verification
Chapter 11 Using Test Doubles
Chapter 12 Organizing Our Tests
Chapter 13 Testing with Databases
Chapter 14 A Roadmap to Effective Test Automation
PART II: The Test Smells 
Chapter 15 Code Smells
Chapter 16 Behavior Smells
Chapter 17 Project Smells
PART III: The Patterns 
Chapter 18 Test Strategy Patterns
Chapter 19 xUnit Basics Patterns
Chapter 20 Fixture Setup Patterns
Chapter 21 Result Verification Patterns
Chapter 22 Fixture Teardown Patterns
Chapter 23 Test Double Patterns
Chapter 24 Test Organization Patterns
Chapter 25 Database Patterns
Chapter 26 Design-for-Testability Patterns
Chapter 27 Value Patterns
PART IV: Appendixes
Appendix A Test Refactorings  
Appendix B xUnit Terminology 
Appendix C xUnit Family Members
Appendix D Tools
Appendix E Goals and Principles
Appendix F Smells, Aliases, and Causes
Appendix G Patterns, Aliases, and Variations
Glossary
References 

Index 


About the Author

Gerard Meszaros is Chief Scientist and Senior Consultant at ClearStream Consulting, a Calgary-based consultancy specializing in agile development. He has more than a decade of experience with automated unit testing frameworks and is a leading expert in test automation patterns, refactoring of software and tests, and design for testability.
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Product Details

  • Hardcover: 833 pages
  • Publisher: Addison-Wesley (May 31, 2007)
  • Language: English
  • ISBN-10: 0131495054
  • ISBN-13: 978-0131495050
  • Product Dimensions: 7.4 x 2.1 x 9.6 inches
  • Shipping Weight: 3.3 pounds (View shipping rates and policies)
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (24 customer reviews)
  • Amazon Best Sellers Rank: #98,926 in Books (See Top 100 in Books)

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Customer Reviews

Most Helpful Customer Reviews

45 of 45 people found the following review helpful By Thing with a hook on August 4, 2007
Format: Hardcover
Let me start by stating the obvious: this is a patterns book about the organisation of tests and the workings of the xUnit family of unit testing frameworks. It is _not_ a book about Test Driven Development, although there is material that is pertinent to that. Given that the use of JUnit and TDD is pretty intertwined in the minds of many Java developers, it's worth making this distinction, so you know what sort of book you're getting. Speaking of JUnit, most of the code examples uses Java, although there are some examples in C#, VB and Ruby.

Like Martin Fowler's Patterns of Enterprise Application Architecture, the book is split into two main sections, a narrative that weaves together a lot of the patterns and strategies, and then a catalogue of individual patterns. Between the two, there is a catalogue of 'test smells', similar to the 'code smells' discussed by Fowler in Refactoring, which I would suggest can be read profitably with the narrative section, rather than used as reference material.

There are a lot of patterns here on the mechanics of xUnit, such as 'Test Runner', 'Garbage-Collected Teardown' and 'Named Test Suite'. I was a bit confused about who this material is aimed at -- maybe someone looking at porting xUnit to a new programming language would find it useful, but a lot of it is fairly obvious to anyone who's used an xUnit in a non-trivial fashion (and certainly, if you haven't done so, this book is not a format that makes for a good introduction), or requires playing against xUnit's strengths (e.g.
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15 of 16 people found the following review helpful By S. Gentile on June 16, 2007
Format: Hardcover
We went over 2,000 unit tests this past week during Iteration 72 on our Agile project. Of course, over the course of the last 18-24 months we have removed some tests, and in many cases, refactored the existing tests many times. We also have been learning a whole lot about TDD and the actual domain that we are building and testing. As we were doing this, we were implicitly discovering Test Smells, and discovering test automation patterns. The value in establishing patterns, and more precisely a pattern language in a particular domain are substantial. It's not so much that the "collector" of patterns is defining something new (some often mistakenly criticize pattern books in that regard) that you didn't know, but defining a shared terminology of our practices that we keep doing over and over. To that end, the patterns themselves not only define a shared vocabulary but serve other functions, not the least of which is learning from others. An obvious example of this is Martin's PEAA collection of patterns that enables us to say things like PageController or Lazy Load or TableDataGateway and we all know what it means. In fact, when I am talking about Interaction versus State/Behavior type of testing on CB, and others here use much of this terminology, I am in fact, talking about patterns like TestDoubles and MockObjects, among others.

When I became aware that Gerard Meszaros ' xUnit Test Patterns book was going to ship Friday, I ordered it for overnight delivery on Saturday. I read well over 200 pages yesterday pretty much at one sitting, contented with a book that will change the face of the software industry, just as JUnit and all the other xUnit family have fundamentally altered software development for the better.
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17 of 19 people found the following review helpful By Gregor Hohpe on June 6, 2007
Format: Hardcover
Writing good tests is not easy. Different developers have come up with many techniques to improve tests. You might have used Backdoor Manipulation to make tests faster or used Custom Assertions to make an Obscure Test more readable. Sometimes a failing test caused you to play Assertion Roulette while you were trying to figure out who the Mystery Guest in this test is and what role he plays.

Gerard documented these (and many more) smells and patterns to help you write better tests. If you have written tests, you have probably used some of them, but even then looking at the patterns described in this book will help you tune your technique. For example Custom Assertions should always take the actual and expected values as parameters, so assertMagicObjectsAreEqual(actual, expected) is good, assertEverythingIsAlright(actual) is bad. And now you have a name for this technique, which makes it easier to explain to your fellow developers what you are doing. At 800+ pages you are bound to find plenty of new techniques as well.

If you are worried that this is another work by the pattern weenies, rest assured. The book follows the very simple and pragmatic "How It Works" and "When to Use It" format also used by Martin Fowlers' Patterns of Enterprise Application Architecture.
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6 of 6 people found the following review helpful By Thomas Duff HALL OF FAMETOP 1000 REVIEWERVINE VOICE on July 4, 2007
Format: Hardcover
By now, the concept of "patterns" in program design is pretty well accepted. And the concept of test-driven development has a solid foundation also. But are there certain "patterns" to building and running those tests? The answer is yes, and the book that covers it is xUnit Test Patterns: Refactoring Test Code by Gerard Meszaros. If you use any of the xUnit software in your development efforts, you need to have this book...

Contents:
Part 1 - The Narratives: A Brief Tour; Test Smells; Goals of Test Automation; Philosophy of Test Automation; Principles of Test Automation; Test Automation Strategy; xUnit Basics; Transient Fixture Management; Persistent Fixture Management; Result Verification; Using Test Doubles; Organizing Our Tests; Testing with Databases; A Roadmap to Effective Test Automation
Part 2 - The Test Smells: Code Smells; Behavior Smells; Project Smells
Part 3 - The Patterns: Test Strategy Patterns; xUnit Basics Patterns; Fixture Setup Patterns; Result Verification Patterns; Fixture Teardown Patterns; Test Double Patterns; Test Organization Patterns; Database Patterns; Design-for-Testability Patterns; Value Patterns
Part 4 - Appendixes: Test Refactorings; xUnit Terminology; xUnit Family Members; Tools; Goals and Principles; Smells, Aliases, and Causes; Patterns, Aliases, and Variations
Glossary; References; Index

Most of the books that cover xUnit software do so from the perspective of a technical manual. Everything is geared to writing the actual code for the test. Meszaros takes a different tack. He covers more of the "why" behind test writing in xUnit, as well as the basic patterns and principles you should be aware of when you're putting together your tests.
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