Slashdot Mirror
Test Driven Development Examples?
esnyder queries: "I find the pragmatic/agile/XP hype about test driven development compelling, but find it hard to see how to test first (or even unit test at all) in some situations. I would like to explore some extended examples of it in a moderate to large scale real world codebase to improve my test design skills. Can anyone recommend some F/OSS software projects that consistently use test driven development processes that I could check out? Preferable over 50K lines of code, but I'd welcome pointers to anything that people think would be helpful."
Where I work we're coding a dating site. Currently, it's up to about 180K lines of scripts written in PHP. However, not a lot of it was written with unit testing (and test-driven development) in mind. I'm a big believer in unit testing but it's been hard to get the other members on board as they complain how hard it is to write unit tests for web pages. Bah.
So, most of the library functions that I wrote (stuff like except an integer, return a text string from a list) have been unit tested by myself, and every time I change a function or a class, I try and write a unit test for it.
Seriously, you just need to dive right in and think about how you make your code easy to test. I use the SimpleTest testing framework (it's PHP), and I always feel good when my array of tests all run correctly when I make a major change to the code that impacts a huge portion of the site.
If test-driven development has done one thing, it's forced me to carefully examine my code to create a way to make sure it is actually working according to the business logic we've been asked to implement.