Misko Hevery made a presentation at Google Tech Talks about unit testing. He tells us that “There is no secret to writing tests… … there are only secrets to writing testable code!”. He describes the different category of tests and shows the importance of unit testing. He describes how to avoid writing untestable code.
[youtube wEhu57pih5w]
Additional resources
Slides of the presentation (requires google account)
Testability-explorer is a tool which analyzes java byte-codes and computes how difficult it will be to write unit-test. It attempts to help you quantitatively determine how hard your code is to test and, where to focus to make it more testable