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    <p>If you're just getting started with testing in the ruby or Rails world, I'd make the following suggestions:</p> <ul> <li>Start with rspec. Automated acceptance/integration testing with a tool like Cucumber can be a large timesink for a single developer who has never used it before. Success with those tools is often contingent upon A) quality UI specs that are very very specific, B) UI conventions which are easily testable with headless browser emulators and C) Familiarity with the tools ahead of go time.</li> <li>Test individual methods. Test that they return the values you expect. Test that when you feed them bad data, they respond in an appropriate manner. Test any edge cases as you become aware of them.</li> <li>Be very careful that you are stubbing and mocking correctly in your tests. It's easy to write a test for 30 minutes only to discover that you're not really testing the thing you need to be testing.</li> <li>Don't go overboard with micro-managing your TDD - some folks will tell you to test every tiny step in writing a method: first test that the model has a method called 'foo', then test whether it returns non-nil, then test that it returns a string, then test that the string contains a certain substring. While this approach can be helpful when you're implementing something complex, it can be a time sink as well. Just skip the first two steps. That being said, it's easy to go too far in the other direction, specifying a method's behavior with a complex test before you begin implementing it, then beginning the implementation only to find you've botched the test.</li> <li>Don't write tests that just say 'this is how i wrote the feature, don't change it'. Tests should reflect the essential business logic of a method. If you are writing tests specifically so that they will fail if another developer changes some non-critical part of your implementation, you are wasting time and adding superfluous lines of code.</li> </ul> <p>These are just a few observations I've made from having been in similar situations. Best of luck, testing can be a lot of fun! No, really. I mean it.</p>
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