TDD refresher
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TDD refresher
- 1. Test-driven development Kerry Buckley 2 November 2012
- 3. Towards TDD 0. manual testing Write Design Test Release code
- 4. Towards TDD 1. automated testing Write Write Design Test Release code tests
- 5. Towards TDD 2. test-first development Write Write Design Test Release tests code
- 6. Towards TDD 3. test-driven development Design Write Run Write test test code Release Run Refactor tests
- 7. Towards TDD 3. test-driven development Red Green Refactor
- 8. Beyond TDD? 4. behaviour-driven development Executable Customer Release examples Red Green TDD Refactor
- 10. Acceptance tests Test System
- 11. Integrated tests Test Test
- 12. Unit tests Test Test Mock Mock Mock
- 13. Anatomy of a test # Given some test accounts ➊ Setup account_1 = Account.new(100) account_2 = Account.new(50) # When I transfer money ➋ Act transfer(20, from: account_1, to: account_2) # Then the balances should be updated ➌ Assert account_1.balance.should eq(80) account_2.balance.should eq(70)
- 14. A good test…
- 15. A good test… • Expresses the programmer’s intent
- 16. A good test… • Expresses the programmer’s intent • Gives confidence that the code works
- 17. A good test… • Expresses the programmer’s intent • Gives confidence that the code works • Only tests one thing
- 18. A good test… • Expresses the programmer’s intent • Gives confidence that the code works • Only tests one thing • Gives clear failure message
- 19. A good test… • Expresses the programmer’s intent • Gives confidence that the code works • Only tests one thing • Gives clear failure message • Is independent of other tests
- 20. A good test suite…
- 21. A good test suite… • Gives confidence that the system works
- 22. A good test suite… • Gives confidence that the system works • Runs quickly
- 23. A good test suite… • Gives confidence that the system works • Runs quickly • Is well-maintained
- 24. A good test suite… • Gives confidence that the system works • Runs quickly • Is well-maintained • Isolates each area under test
- 25. Benefits of TDD
- 26. Benefits of TDD • Less manual testing required
- 27. Benefits of TDD • Less manual testing required • Faster feedback
- 28. Benefits of TDD • Less manual testing required • Faster feedback • Make it safe to change code
- 29. Benefits of TDD • Less manual testing required • Faster feedback • Make it safe to change code • Reduced rework and debugging
- 30. Benefits of TDD • Less manual testing required • Faster feedback • Make it safe to change code • Reduced rework and debugging • Improved design
- 31. How do I start?
- 32. How do I start? • Greenfield project? JFDI! Otherwise…
- 33. How do I start? • Greenfield project? JFDI! Otherwise… • Automate highest value tests first
- 34. How do I start? • Greenfield project? JFDI! Otherwise… • Automate highest value tests first • Important features
- 35. How do I start? • Greenfield project? JFDI! Otherwise… • Automate highest value tests first • Important features • Where the most bugs occur
- 36. How do I start? • Greenfield project? JFDI! Otherwise… • Automate highest value tests first • Important features • Where the most bugs occur • Use TDD for new features
- 37. How do I start? • Greenfield project? JFDI! Otherwise… • Automate highest value tests first • Important features • Where the most bugs occur • Use TDD for new features • Add tests for bugs when they’re found
- 38. Further reading
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