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 difficult to write !
- 7. HARD FACT #1 Tests assertions are needlessly difficult to write !
- 8. HARD FACT #1 Tests assertions are needlessly difficult to write !
- 9. HARD FACT #1 CONSEQUENCES error-prone reluctance to write tests relevance of tests? Tests assertions are needlessly difficult to write !
- 10. #1:WE DESERVE NO BRAINER ASSERTIONS!
- 11. HARD FACT #2 Test intentions may be difficult to grasp
- 12. HARD FACT #2 CONSEQUENCES tests are hard to maintain loss of trust in existing tests Removal of failing tests? Test intentions may be difficult 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 understand slowwww… TDD feedback loop Poor efficiency?!? 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 EASY…
- 19. TDD IS NOT EASY… … but NFluent will greatly help you
- 20. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! (source: http://www.thefreedictionary.com/fluent) UBIQUITOUS LANGUAGE Fluent [ˈfluːənt] adj 1. spoken or written with ease: fluent French. 2. able to speak or write smoothly, easily, or readily: fluent in three languages. 3. smooth; easy; graceful: fluent motion 4. flowing or capable of flowing; fluid ! [from Latin: fluere to flow, stream]
- 21. #1: NO BRAINER ASSERTIONS! NFLUENT’S ANSWERS #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL ERROR MESSAGES!
- 22. #1: NO BRAINER ASSERTIONS! NFLUENT’S ANSWERS A unique entry point for assertions (Check.That) IntelliSense guided writing (a.k.a. the super-duper-happy dot xp) #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL ERROR MESSAGES!
- 23. #1: NO BRAINER ASSERTIONS! NFLUENT’S ANSWERS Natural language assertions A unique entry point for assertions (Check.That) IntelliSense guided writing (a.k.a. the super-duper-happy dot xp) #2: OBVIOUSTESTS INTENTIONS! #3:TRUSTWORTHY & HELPFUL ERROR MESSAGES!
- 24. #1: NO BRAINER ASSERTIONS! NFLUENT’S ANSWERS Natural language assertions A unique entry point for assertions (Check.That) 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 ERROR MESSAGES!
- 25. COMBINING THOSE 3 WISHES, WE CAN REACH OUR IDEAL: EFFICIENT TDD!
- 27. DEMO
- 28. • NFluent is • An OSS .NET library for fluent assertions • Independent and compliant with all major .NET test runners • Directly inspired by the awesome Java FEST assert library • Available on IN A FEW WORDS
- 29. • A fully extensible model • No need to wait the NFluent team to add your own assertions on any kind of ‘value’ • The opportunity to use your own ubiquitous language (DSL) from within your tests ! • Some extra candies • Like the Properties extension method for IEnumerable • The HasFieldsWithSameValues(anonymous class) BONUS FEATURES
- 31. FINAL QUESTION
- 32. ! ! ! ! ! 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.) • Their usage of lambda expression predicates hurts the fluent experience new[] { 1, 2, 3 }.Should().Contain(item => item > 3, "at least {0} item should be larger than 3", 1); • (Red is dead, but) Should is weak… • We aim to be more ambitious in term of fluentness NFLUENT VS. OTHER ASSERTION LIBRARIES?
- 41. • For NFluent contributors • No warning (all warn as ERROR) • No StyleCop warning (full rules) • 100% of test coverage - all test passed of course! • The entire build lasts less than a minute (including all unit tests) DEFINITION OF DONE
- 43. Use NFluent! ! ! ! ! WRITEVALUABLETESTS (NFluent logo © rhwy) ! http://www.n-fluent.net Thank you!