Intro To TDD

A short session introducing Test Driven Development presented at Evergreen State University in Olympia, Washington.

Transcript

1. Intro to Test Driven Development
2. Jim Holmes Executive Consultant, Guidepost Systems LLC Jim@GuidepostSystems.com GitHub: JimHolmes Xbox: FrazzledDad Blogs: http://GuidepostSystems.com http://FrazzledDad.com Coding for Non-Coders: Lesson 1—Course Introduction Who am I?
3. Slides: https://speakerdeck.com/ jimholmes/intro-to-tdd
4. How do you know your stuff works?
5. How do you know you built the right thing?
6. How do you keep your stuff working?
7. Goals for today: Talk about building test cases Spend some writing tests and code
8. Level Set: What are all y’all working with? (testing, specs, etc.)
9. Why writing tests matters
10. Correctness
11. Maintainability
12. Why writing tests first matters
13. Stay lean
14. Focus on value
15. Red Refactor Green
16. Think Refactor Green Red
17. The problem
18. Customer wants a payroll system
19. Today’s work: Figure payroll for hourly workers
20. Let’s write some specs!
21. Hours Worked Hourly Rate Wages Should Be 0 10 0 1 10 10 40 10 400 41 10 415 60 10 700 61 10 Error. Requires supervisor review (Business rule!) -1 10 Error. Do not process 1 -1 Error. Do not process 10 Max Value (500) 10 * max value. 10 Max Value + 1 Error. Requires supervisor review (Business rule!) 10 1 10
22. Let’s write some tests!