Open source bridge testing antipatterns presentation
- 1. Testing Antipatterns Matt Robinson Puppet Labs
- 2. Anti - What?
- 3. Antipattern ( Dark Pattern ): A pattern that is commonly used but is ineffective and/or counterproductive
- 5. Who has an extensive test suite?
- 6. Who feels like they should test more?
- 7. Who dislikes, even dreads, writing tests?
- 8. Testing Can Be Fun Text Text Text Text http://xkcd.com/583/
- 9. For example:
- 10. Red Green TDD Addiction
- 11. Testing Framework Games (although these can be a distraction) (although these can be a distraction)
- 12. Not looking like an idiot - that’s fun right?
- 13. Why Automated Testing? Prevents regressions Improves confidence Documents requirements Catches errors before codes ships You fill in the blank _________
- 14. Overheard Reasons Not to Test Don’t trust the tests Who tests the tests? Quis custodiet ipsos custodes? Makes refactoring harder Not enough return on investment (ROI) Too hard and/or time consuming
- 15. Antipatterns that have bitten me the most
- 16. Not Running Tests Often Enough
- 17. If it’s Hard and Important Do it More Often
- 18. testing, deploying, releasing, exercising, meditating, writing, public speaking
- 19. How Often? Before deployment or release After every commit: CI (Continuous Integration) - Jenkins, Cruise Control, BuildBot, Cerebrus, CI Joe Before every commit (or push): discipline, git hooks Every save: autotest, watchr
- 20. Not Fixing Broken Tests Before Committing New Code
- 21. The Slowpoke
- 22. How Slow Is Too Slow?
- 23. Unit Test Suite Took 8 Hours to Run - On One Project
- 24. Single Test Took 2 Minutes to Start
- 25. So slow that rewriting it in PHP would make it faster
- 26. How to Get Faster Make your implementation code faster Run your tests in parallel Optimize your tests (new framework, trick garbage collector, rewrite culprits) Mark some tests as slow and only run them occasionally
- 27. The Mockery
- 28. Why mock when the real things will do?
- 29. Testing at the Wrong Level
- 30. unit, smoke, functional, integration, acceptance
- 31. Success Against All Odds (test never fails) (test never fails)
- 33. Testing Implementation Instead of Behavior
- 35. Testing Behavior
- 37. You’ve got too much global state
- 38. Excessive Setup
- 39. What are we testing again?
- 40. The Dodger - Never tests desired behavior The Stranger - Misplaced tests Local Hero - Worked on my dev box Generous Leftovers - Fills your hard drive The Giant - You may have a God object The Loudmouth - Spams your test logs Other Antipatterns
- 41. Summary
- 42. Avoid Antipatterns and Testing Can Be Fun
- 43. Links http://blog.james-carr.org/2006/11/03/tdd-anti-patterns/ http://jasonrudolph.com/blog/testing-anti-patterns-how-to-fail-with-100-test-coverage/ http://blog.rubybestpractices.com/posts/gregory/034-issue-5-testing-antipatterns.html http://c2.com/cgi/wiki?AntiPatternsCatalog http://martinfowler.com/articles/mocksArentStubs.html
Editor's Notes
- #2: Ask questions whenever you want
- #4: Talk about Design Patterns general reusable solution to a commonly occurring problem
- #9: Realized while writing this talk that I was focusing on what pissed me off and made me not want to talk about it. Should be humor in testing.
- #11: Red failing Green passing
- #17: Not really an antipattern since it’s really only solving being lazy
- #20: CI essentially glorified cron job
- #21: The Joel Test #5: Fix bugs before writing new code Mention Lava Lamps
- #28: Martin Fowler Mocks aren't Stubs. Never met a mockist whose tests I liked. Not mocking means mini integration tests. Possibly controversial. When to mock: code you don't control - file system, web server, external libraries like ssl
- #30: Too much mocking might indicate this
- #31: Everyone has their own terms
- #32: Test Driven Development prevents this
- #34: Behaviour Driven Development is a larger term with more meaning
- #37: These are annoying but can’t be ignored. How to find these failures - binary search.
- #38: Testing antipatterns can indicate antipatterns in your implementation code
- #40: Data driven web apps tend to be even worse