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How to get Started with TDD

Tuesday, November 17, 2009
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Labels: Misko Hevery

10 comments :

  1. GiorgioNovember 17, 2009 at 4:25:00 AM PST

    Interesting approach.. I usually test extensively the model and not the controller but I guess user-request handling constitutes the big part of this application.

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  2. DavidNovember 17, 2009 at 5:32:00 AM PST

    Nice initiative. Your TDD description is however missing the most important step: refactor. Without refactoring after making your tests pass, your code will quickly become unmaintainable.

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  3. JammyZNovember 17, 2009 at 8:24:00 AM PST

    OK, I've already started doing it.
    A few questions:
    What should the tick button do?
    Do we have to support more than two operands (e.g 168+152+23)?

    I like the test autorunning feature.

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  4. Esko LuontolaNovember 17, 2009 at 4:17:00 PM PST

    I also have created a tutorial for learning TDD. It's a bit larger than yours (a Tetris game) and has much more pre-written tests before it's time to write your own tests. Checkout the "tutorial" branch from http://github.com/orfjackal/tdd-tetris-tutorial and follow the instructions in the README file.

    This far I've used that as an exercise on one course (http://www.cs.helsinki.fi/u/luontola/tdd-2009/) and it appeared to get the students started in TDD quite nicely. It would be nice to get some feedback from others.

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  5. Néstor SalcedaNovember 18, 2009 at 2:40:00 AM PST

    Hey, I think you already know this, but the Test-First Challenge (http://xp123.com/xplor/xp0201/) can also help getting started on TDD.

    BTW a nice blog post !

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  6. UnknownNovember 18, 2009 at 7:00:00 AM PST

    Hi Misko,

    You're becoming a star - We do a webcast on testing called “This week in testing” and this week, we talk about this post about starting TDD.

    You’re welcome to watch and comment (http://learn.typemock.com/this-week-in-test/2009/11/18/episode-4-animals-that-talk-back.html) and if you like what you see, please tell the whole world.

    Thanks,

    Gil Zilberfeld
    Typemock

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  7. YvanNovember 18, 2009 at 11:43:00 PM PST

    Good idea, but it's a shame you didn't write proper build scripts.
    Some people don't use Eclipse.

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  8. Edwin Carlo Ribeiro MarinhoNovember 19, 2009 at 11:26:00 AM PST

    "I know it is trivial example, but you need to start someplace."

    I think that it will be a very good start point to those that are learning TDD, but with a previous knowledgement of JUnit.

    :)

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  9. JohnNovember 24, 2009 at 11:45:00 AM PST

    For windows developers you also need to change the ":" to a ";" in the arguments for the "Tests" builder. The line should be:
    -cp .;${workspace_loc:/01_Calculator/lib}/junit.jar AllTests

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  10. WimDecember 1, 2009 at 8:21:00 AM PST

    I don't usually do TDD (I write tests after) and I found it hard to get started with this one. I got a bit into trouble with writing a bunch of tests, then realising I'd rather change the model and ending up with a huge slew of tests that were now nonsensical.

    But maybe it's due to my resistance to using a String model for a numeric value. :-)

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