Unit testing is hardly news, but simply writing a ton of tests guarantees you no bliss. Gerard Meszaros's xUnit Test Patterns distills and codifies the crucial. xUnit Test Patterns is the definitive guide to writing automated tests using xUnit, the most popular unit testing framework in use today. Agile coach and test. If you go to ronaldweinland.info, you'll see a quote from me: "never in the field of software development have so many owed so much to so few lines of code". JUnit has been.
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software-development-ebooks/[xUnit Test Patterns Refactoring Test Code ( Addison-Wesley Signature Series (Fowler)) Kindle Edition by Gerard Meszaros. Editorial Reviews. From the Back Cover. Automated testing is a cornerstone of agile eBook features: Highlight, take . Explore limited-time discounted eBooks. Read "xUnit Test Patterns Refactoring Test Code" by Gerard Meszaros available from Rakuten Kobo. Sign up today and get $5 off your first download. Automated.
Part I consists of a series of introductory narratives that describe some aspect of test automation using xUnit. This includes a list of Goals and Principles which are summarized on the left size of this diagram: Sketch Goals-Smells embedded from Goals-Smells. These symptoms are summarized in the right side of the previous diagram. Part III contains descriptions of the patterns. The chapters correspond to the major boxes in the following diagram: Sketch Patterns Summary embedded from Patterns Summary. Selecting a category provides a list of patterns or smells in the category and selecting a specific pattern or smell adds a list of aliases, causes and variations of the chosen pattern or smell.
Automated test are more repeatable than manual tests because they execute exactly the same way every time. They don't forget things after long weekends and vacations. They don't leave to work on other projects. They don't get sick or run over by a bus. Automated tests take a lot less effort to run than manual tests. As a result, they are more likely to be run often.
The more often the better.
Fully assimilated agile developers run their tests pretty well every time they save and compile their code. And any time they need a quick vote of confidence! The tests act as a comforting "safety net" that promises to catch the developer's mistakes. This allows them to work more quickly and with less paranoia and that makes them more productive despite the extra effort involved in writing the tests.
Cost effective test automation is all about repeatability, maintainability and communication. Repeatability of results requires repeatability of test fixture setup and repeatability of the interactions with the software under test. And that requires interfaces into the software under test that allow you to put it in the right state before the test and to find out what state it is in after the test.
And that can be hard. Throw in the need to make the tests easy to understand and easy to maintain and the problem gets even harder. Automating tests using XUnit is a form of software whether you write the tests before or after the code it tests. But the goals of this test software "testware" is very different from the software most people are used to writing.
Writing it is optional so we can stop writing it or maintaining it at any time.
So we need compelling reason to keep writing them. And there is a lot to think about when automating tests. How do I interact with the SUT? What is the best way to express the expected outcome? How can I keep tests from breaking each other?
How can I ensure the tests will work next week, next month, even next year? How do I test when the software under test depends on software that hasn't been written yet?
Or cannot be used in our test environment? Or makes the tests take too long to run?
If writing the tests is hard and has little benefit, we just won't do it any more! I have been reading the various conference papers and mostly JUnit-based books on test automation for quite some time.
Each author seems to have a particular area of interest and favorite techniques. This is one of the major different between prose that merely explains a technique and a pattern.
Patterns help the reader understand the WHY behind each practice so they can make intelligent choices between the alternative patterns and thereby avoid nasty consequences from surprising them later. Some projects are using the XUnit tools to automate regression tests.
All of these initiatives are more successful when the test developers have experience building tests. And the next best thing to having experience test automaters on your project which ClearStream Consulting would be more than happy to supply is a well-documented set of good test automation practices in the form of patterns.
I've assembled this site to catalog the good practices in xUnit test automation I've encountered over the years. It's more than just JUnit, of course. Ports of JUnit have been written for lots of programming languages. This loose family of tools, often referred to as xUnit tools, have spread their way far beyond the java roots. And of course the roots weren't really in Java, as Kent Beck wrote this code for Smalltalk years before.
XUnit tools, and more importantly the philosophy, offer up a huge opportunity to programming teams. An opportunity to write powerful regression test suites that enable teams to make drastic changes to a code-base with far less risk.
Opportunities to re-think the design process with Test Driven Development. But with these opportunities come new problems and new techniques. Like any tool, the xUnit family can be used well or badly. A great reference book on patterns around testing, not so interesting to read from cover-to-cover.
However, when you have a problem with your automated tests, then there is most likely a solution in this book. Many problems you run into with starting test automation are covered.
I wish I had read this book years before and would not have needed to make the errors for myself. If you are testing your software with automated tests, then this book is a must-read. Go on and read part one and the chapters who answer the questions you have at the moment. This will be time well spend and saves you hours of pain.
An amazing text on testing. I read the first pages, the narrative , and skimmed the rest of the catalog of patterns. It does a great job of defining a vocabulary for unit testing and really nails down the terminology.
The narrative format really brings the language to life, shows how all the terminology fit together very nicely. A must read for anyone doing unit testing with any of the xUnit frameworks. This book starts with philosophy, principles, and then gets into foundations of unit tests and finally with the catalog of patterns.
It also discusses smells and refactoring. Definitely the best resource I've found to understanding the xUnit framework and how to apply it effectively.
It took me the better part of the year to get through it all although I was reading it in 15 minute intervals. An exhaustive essay about unit testing. I really love this book because I learned so much, event if it's sometimes somewhat tiring to read due to many repetions because the book is desiged as a reference book.
Great book learns you a lot about how to tackle writing tests in a lot of different cases. Awesome betook that really expanded my thinking on testing. I learned much from this book. It was a turning point in my career. I cannot recommend it highly enough! One of the bests books for unit testing.
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