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Test Driven Development/Design

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An introduction to TDD and how it relates to design and best practices.

An introduction to TDD and how it relates to design and best practices.

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Test Driven Development/Design Test Driven Development/Design Presentation Transcript

  • “Can you make *any+ class work outside the application? Can you get it to the point where you can tinker with it, in real time, build it alone in less than a second, and add tests to find out what it really does in certain situations? (…) That's where we are in the industry now (…) Best practices have gotten a whole lot better in the last five years.” _ Michael Feathers http://www.artima.com/weblogs/viewpost.jsp?thread=42486
  • TDD lets you take off the blindfold. Tests are a safety net which allow us to refactor code relentlessly without worrying about accidentally breaking stuff.
  • Each test is an (executable) example which tells you how some particular part of the system works.
  • When you have tests that both document how your code works and verifies that it does work, you’ll spend a lot less (or no) time debugging.
  • “One of the most useful times to write tests is before you start programming. When you need to add a feature, begin by writing the test. (…) By writing the test you are asking yourself what needs to be done.” _ Martin Fowler http://www.amazon.com/Refactoring-Improving-Existing-Addison-Wesley- Technology/dp/0201485672/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1233235687 &sr=8-1
  • “We get a double benefit from test-first approaches; not only do they lead us to think deeply about design at design time, but their legacy is a test suite that documents and supports ongoing development of the system.” _ Jim Webber http://jim.webber.name/2009/01/30/83fba2cc-d1a5-4271-86a4-55e7f6b51c06.aspx
  • You do not talk about TDD.
  • You are not allowed to write any production code unless it is to make a failing unit test pass. http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
  • You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures. http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
  • You are not allowed to write any more production code than is sufficient to pass the one failing unit test. http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
  • “Every genuine test of a theory is an attempt to falsify it, or to refute it. (…) Confirming evidence should not count except when (..) it can be presented as a serious but unsuccessful attempt to falsify [a] theory.” _ Sir Karl Popper http://iridescence.no/post/Testability-is-Falsifiability.aspx
  • You can verify the resulting state of the System Under Test (SUT), or verify the protocol of the interactions with its collaborators. http://benpryor.com/blog/2007/01/16/state-based-vs-interaction-based-unit-testing/ http://www.infoq.com/news/2009/01/classic-mockist-tdd http://www.natpryce.com/articles/000342.html
  • 1. Set up the test context 2. Exercise the SUT 3. Verify the result state (or interactions). http://www.lostechies.com/blogs/jimmy_bogard/archive/2008/07/24/arrange-act-assert-and-bdd-specifications.aspx
  • The Single Responsibility Principle (SRP) applied to testing: One test should be responsible for verifying only one thing about the SUT. Each test should have only one reason to fail. http://blog.jayfields.com/2007/06/testing-one-assertion-per-test.html http://www.ayende.com/Blog/archive/2007/08/05/What-is-one-assert.aspx
  • I write a failing test. Ping. You write the necessary code to make my test pass, and then write a new, failing test. Pong. I write the necessary code to pass your test. Rinse and repeat. http://www.stickyminds.com/sitewide.asp?Function=edetail&ObjectType=COL&ObjectId=9101 http://xprogramming.com/blog/2009/01/28/pair-programming-how-important-is-it/
  • “Failure of the team to inspect and adapt, especially in taking on good development practices such as found in XP (…) can DISABLE Scrum “ _ Ron Jeffries http://www.scrummaster.com.au/Article.mvc/detail/48
  • “*The fact that+ design patterns makes code easier to test is more proof that they actually work, but this is just a side effect of the more primary issue: these patterns make programming easier... period.“ _ Scott Bellware http://iridescence.no/post/Unit-Testing-Gives-Merit-to-Design-Patterns.aspx
  • “TDD forces you to (…) create better, less coupled designs.“ _ Uncle Bob Martin http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
  • “*care about+ things that aren't just functional, but easy to read, elegantly maintainable (…) and sometimes flat-out sexy. A passion for aesthetics can mean the difference between code that others enjoy working on vs. code that's stressful to look at.” _ Kathy Sierra http://headrush.typepad.com/creating_passionate_users/2006/03/code_like_a_gir.html
  • According to a study, people procrastinate when asked to think in the abstract, and act in a timely way when given concrete tasks. http://www.economist.com/science/displaystory.cfm?story_id=12971028 http://twitter.com/mfeathers/statuses/1148828932
  • http://www.amazon.com/xUnit-Test-Patterns-Refactoring-Addison-Wesley/dp/0131495054 http://www.amazon.com/Working-Effectively-Legacy-Robert-Martin/dp/0131177052 http://www.amazon.com/Test-Driven-Development-Addison-Wesley-Signature/dp/0321146530/ http://www.amazon.com/gp/product/0321125215/