iPhone Unitesting using SenTestingKit. One LogicTest.m file and target file for all?

I recently started looking into how I can unit test my application. I configured my Xcode environment following Apple's iOS_Development_Guide in chapter 7 and I've run the sample LogicT开发者_开发百科ests Target file which is now dependent with my Application's target.

My Question now is: Am I supposed to create a new test-case class file for every Class file of my app and link it to the LogicTests target file?

What is the best approach for unit testing and existing application?

Thanks

---

You create a new test case for each "unit" that you would like to test. A typical convention is that you have one test class per actual class, but you don't have to, you can have one test class per feature, for example.

Off-topic: Take a look at GHUnit. It's so much more pleasant to work with than SenTestingKit.