Is Unit Testing worth the effort? -

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i working integrate unit testing development process on team work on , there sceptics. ways convince sceptical developers on team of value of unit testing? in specific case adding unit tests add functionality or fixed bugs. unfortunately our code base not lend easy testing.

every day in our office there exchange goes this:

"man, love unit tests, i've been able make bunch of changes way works, , able confirm hadn't broken running test on again..."

the details change daily, sentiment doesn't. unit tests , test-driven development (tdd) have many hidden , personal benefits obvious ones can't explain until they're doing themselves.

but, ignoring that, here's attempt!

  1. unit tests allows make big changes code quickly. know works because you've run tests, when make changes need make, need tests working again. saves hours.

  2. tdd helps realise when stop coding. tests give confidence you've done enough , can stop tweaking , move on next thing.

  3. the tests , code work achieve better code. code bad / buggy. test bad / buggy. in tdd banking on chances of both being bad / buggy being low. it's test needs fixing that's still outcome.

  4. tdd helps coding constipation. when faced large , daunting piece of work ahead writing tests moving quickly.

  5. unit tests understand design of code working on. instead of writing code something, starting outlining conditions subjecting code , outputs you'd expect that.

  6. unit tests give instant visual feedback, feeling of green lights when we've done. it's satisfying. it's easier pick left off after interruption because can see got - next red light needs fixing.

  7. contrary popular belief unit testing not mean writing twice code, or coding slower. it's faster , more robust coding without tests once you've got hang of it. test code relatively trivial , doesn't add big overhead you're doing. 1 you'll believe when you're doing :)

  8. i think fowler said: "imperfect tests, run frequently, better perfect tests never written @ all". interpret giving me permission write tests think they'll useful if rest of code coverage woefully incomplete.

  9. good unit tests can document , define supposed do

  10. unit tests code re-use. migrate both code and tests new project. tweak code till tests run again.

a lot of work i'm involved doesn't unit test (web application user interactions etc.), we're test infected in shop, , happiest when we've got our tests tied down. can't recommend approach highly enough.


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