TDD in PHP - Memphis PHP 2011-08-25
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The document is a presentation about test-driven development (TDD) in PHP. It introduces TDD and the speaker, defines the TDD process, lists benefits and drawbacks, and demonstrates a live coding example of using TDD to build a calculator and tutor class. The example shows writing tests first, then code to pass the tests, and refactoring with confidence due to the tests. The goals are to provide a practical TDD example and demonstrate how TDD impacts design decisions.
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TDD in PHP - Memphis PHP 2011-08-25
- 1. TDD in PHP: A Brief Example
- 2. About Me Jeremy Kendall PHP Developer since 2001 Organizer Memphis PHP Author at http://csiphp.com [email_address] @JeremyKendall http://about.me/jeremykendall
- 3. TDD in PHP: A Brief Example Test Driven Development, you say?
- 4. Frankly, my dear . . .
- 5. Frankly, my dear . . .
- 6. Why You Should Give A Damn ” Good design is testable, and design that isn't testable is bad.” – Michael C. Feathers
- 7. What is TDD? From Wikipedia:
- 8. ” Test Driven Development (TDD) is a software development process that relies on the repetition of a very short development cycle . . .”
- 9. TDD Development Process Write a test
- 10. Run all tests, watch new test fail
- 11. Write just enough code to make the test pass
- 12. Run all tests, watch new test pass
- 13. Lather, rinse, repeat . . .
- 14. Refactor
- 15. TDD: The Benefits High cohesion, loose coupling
- 16. Confidence
- 17. Faster time to resolution
- 18. Documentation
- 19. TDD: The Drawbacks Tests only cover what you think should be tested
- 20. False sense of confidence
- 21. Without management and team buy-in, TDD is DOA
- 22. TDD: Live Code Example Live Coding? Really? Why?
- 23. TDD: Live Code Example Goals Practical example of TDD in action
- 24. Demonstrate refactoring with confidence
- 25. Demonstrate TDD impact on design decisions
- 26. TDD: Live Code Example Code example will test a fictional math tutor application Calculator class
- 27. Tutor class (consumes calculator)
- 28. TDD: Live Code Example Calculator class Adds one integer to another
- 29. Throws exceptions in the following cases: Non-integer arguments provided
- 30. Integer overflow
- 31. Integer underflow Code to interface not implementation Tutor\Calculator\CalculatorInterface
- 33. TDD: Live Code Example Tutor class Verifies correct responses
- 34. Uses calculator class(es) to test responses
- 35. Favors composition over inheritance Tutor\MathTutor _construct(CalculatorInterface $c)
- 36. TDD: Live Code Example We'll be using PHPUnit
- 37. PHPUnit will be configured with phpunit.xml
- 38. phpunit.xml: Calls bootstrap.php
- 39. Tells PHPUnit where to look for our tests
- 40. Code coverage and testdox reports bootstrap.php: Adds our library to the include path
- 42. LET'S GET IT ON!
- 43. Resources Test Driven Development at Wikipedia - http://bit.ly/9Aa3Xr
- 44. PHPUnit - http://www.phpunit.de/
- 46. The code example in this presentation was adapted for PHP from Przemysław Bielicki's TDD video tutorial at Agile Software Development. - http://bit.ly/byDZOA
- 47. Resources
- 48. Resources s
- 49. Resources
- 50. Thanks! [email_address] @JeremyKendall http://about.me/jeremykendall