I like to use JUnit to test my classes and them QUnit to test services (unit testing) those are very similar test tools, it helps a lot at the dev cycle, not just to validate the code.
Moreover, take care with "sample" data in dev environment, it is trick! Tests go ok in dev environment and fail in production with the full dataset!
For UI and more advanced tests call a tester! To test is not simple, do not underestimate tests! Testers are really crazy people! They come um for example with sophisticated test tools such as "mutation code testing", this is something that the devs are not really going to do by hand!
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