NFluent Brown bag lunch January 2014
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Slides of the Brown Bag Lunch session at SG CIB, dedicated to NFluent. Video also available here: https://www.youtube.com/watch?v=fJuDLWJiIJc
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NFluent Brown bag lunch January 2014
- 1. ASYOU MEANT IT⊠⚠NFluent: the craft you needed ⚠to boost yourTDD⚠Brown Bag Lunch - 2014 ! ! @tpierrain @cyrdup
- 2. WHO ARE WE? use case driven (blog) Many Cores (blog)
- 4. COMMENTS?
- 5. IDEAL WORLD
- 6. HARD FACT #1 Tests assertions are needlessly difïŹcult to write !
- 7. HARD FACT #1 Tests assertions are needlessly difïŹcult to write !
- 8. HARD FACT #1 Tests assertions are needlessly difïŹcult to write !
- 9. HARD FACT #1 CONSEQUENCES error-proneâš reluctance to write testsâš relevance of tests? Tests assertions are needlessly difïŹcult to write !
- 10. #1:WE DESERVE NO BRAINER ASSERTIONS!
- 11. HARD FACT #2 Test intentions may be difïŹcult to grasp
- 12. HARD FACT #2 CONSEQUENCES tests are hard to maintainâš loss of trust in existing testsâš Removal of failing tests? Test intentions may be difïŹcult to grasp
- 13. #2: TESTS INTENTIONS SHOULD BE OBVIOUS!
- 14. HARD FACT #3 When reliable⊠error messages are often unhelpful
- 15. HARD FACT #3 CONSEQUENCES Need to debug the failing test to understandâš slowwww⊠TDD feedback loopâš Poor efïŹciency?!? When reliable⊠error messages are often unhelpful
- 16. #3:WE WANTTRUSTWORTHY & HELPFUL ERROR MESSAGES!
- 17. #3:WE WANTTRUSTWORTHY & HELPFUL ERROR MESSAGES!
- 18. TDD IS NOT EASYâŠ
- 19. TDD IS NOT EASY⊠âšâš ⊠but NFluent will greatly help you
- 20. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! (source: http://www.thefreedictionary.com/ïŹuent) UBIQUITOUS LANGUAGE Fluent [ËïŹuËÉnt] adj 1. spoken or written with ease: ïŹuent French. 2. able to speak or write smoothly, easily, or readily: ïŹuent in three languages. 3. smooth; easy; graceful: ïŹuent motion 4. ïŹowing or capable of ïŹowing; ïŹuid ! [from Latin: ïŹuere to ïŹow, stream]
- 21. #1: NO BRAINER ASSERTIONS! NFLUENTâS ANSWERS #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL âš ERROR MESSAGES!
- 22. #1: NO BRAINER ASSERTIONS! NFLUENTâS ANSWERS A unique entry point for assertions (Check.That)âšâš IntelliSense guided writing (a.k.a. the super-duper-happy dot xp) #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL âš ERROR MESSAGES!
- 23. #1: NO BRAINER ASSERTIONS! NFLUENTâS ANSWERS Natural language assertions A unique entry point for assertions (Check.That)âšâš IntelliSense guided writing (a.k.a. the super-duper-happy dot xp) #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL âš ERROR MESSAGES!
- 24. #1: NO BRAINER ASSERTIONS! NFLUENTâS ANSWERS Natural language assertions A unique entry point for assertions (Check.That)âšâš IntelliSense guided writing (a.k.a. the super-duper-happy dot xp) Non ambiguous, contextualized and explicit error messages #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL âš ERROR MESSAGES!
- 25. COMBINING THOSE 3 WISHES, WE CAN REACH OUR IDEAL:âš EFFICIENT TDD!
- 27. DEMO
- 28. âą NFluent is âą An OSS .NET library for ïŹuent assertions âą Independent and compliant with all major .NET test runners âą Directly inspired by the awesome Java FEST assert library âą Available on IN A FEW WORDS
- 29. âą A fully extensible model âą No need to wait the NFluent team to add your own assertions on any kind of âvalueâ âą The opportunity to use your own ubiquitous language (DSL) from within your tests ! âą Some extra candies âą Like the Properties extension method for IEnumerable âą The HasFieldsWithSameValues(anonymous class) BONUS FEATURES
- 31. FINAL QUESTION
- 32. ! ! ! ! ! âš Does your test framework dictate the way you work, or is it the other way around? FINAL QUESTION
- 33. APPLYTDD!
- 38. APPENDIX
- 39. TDD:A WORKFLOW
- 40. (like: FluentAssertion, SharpTests Ex, etc.)âš âą Their usage of lambda expression predicates hurts the ïŹuent experience new[] { 1, 2, 3 }.Should().Contain(item => item > 3, "at least {0} item should be larger than 3", 1); âą (Red is dead, but) Should is weak⊠⹠We aim to be more ambitious in term of ïŹuentness NFLUENT VS. OTHER ASSERTION LIBRARIES?
- 41. âą For NFluent contributors âą No warning (all warn as ERROR) âą No StyleCop warning (full rules) âą 100% of test coverage - all test passed of course! âą The entire build lasts less than a minute (including all unit tests) DEFINITION OF DONE
- 43. âš Use NFluent! ! ! ! ! WRITEVALUABLETESTS (NFluent logo © rhwy) ! http://www.n-ïŹuent.net Thank you!