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Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
Tdd in php   a brief example
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Tdd in php a brief example

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  • 1. TDD in PHP: A Brief Example
  • 2. About Me Jeremy Kendall PHP Developer since 2001 Organizer Memphis PHP Contributor to FRAPI project (getfrapi.com) [email_address] @JeremyKendall http://jeremykendall.net
  • 3. TDD in PHP: A Brief Example Test Driven Development, you say?
  • 4. Frankly, my dear . . .
  • 5. Why You Should Give A Damn <ul>Test Driven Development is perhaps one of the best and fastest ways to improve your understanding and command of object-oriented principles and best practices. </ul>
  • 6. What is TDD? <ul><li>From Wikipedia:
  • 7. ” Test Driven Development (TDD) is a software development process that relies on the repetition of a very short development cycle . . .” </li></ul>
  • 8. TDD Development Process <ul><li>Write a test
  • 9. Run all tests, watch new test fail
  • 10. Write just enough code to make the test pass
  • 11. Run all tests, watch new test pass
  • 12. Lather, rinse, repeat . . .
  • 13. Refactor </li></ul>
  • 14. TDD: The Benefits <ul><li>High cohesion, loose coupling
  • 15. Confidence
  • 16. Faster time to resolution
  • 17. Documentation </li></ul>
  • 18. TDD: The Drawbacks <ul><li>Tests only cover what you think should be tested
  • 19. False sense of confidence
  • 20. Without management and team buy-in, TDD is DOA </li></ul>
  • 21. TDD: Live Code Example <ul>Live Coding? Really? Why? </ul>
  • 22. TDD: Live Code Example <ul><li>Code example will test a integer calculator for a fictional Math Tutor application
  • 23. Requirements </li><ul><li>Will add one integer to another
  • 24. Throws exceptions in the following cases: </li><ul><li>Non-integer arguments provided
  • 25. Integer overflow
  • 26. Integer underflow </li></ul></ul></ul>
  • 27. TDD: Live Code Example <ul><li>We'll be using PHPUnit
  • 28. PHPUnit will be configured with phpunit.xml
  • 29. phpunit.xml: </li><ul><li>Calls bootstrap.php
  • 30. Tells PHPUnit where to look for our tests
  • 31. Code coverage and testdox reports </li></ul><li>bootstrap.php: </li><ul><li>Adds our library to the include path
  • 32. Registers a simple autoloader </li></ul></ul>
  • 33. TDD: Live Code Example <ul><li>Design Decisions </li><ul><li>PEAR naming convention
  • 34. Interface, not implementation
  • 35. Interface: Tutor_Calculator_Interface
  • 36. Implementation: Tutor_Calculator_IntegerCalculator </li></ul></ul>
  • 37. LET'S GET IT ON!
  • 38. Resources <ul><li>Test Driven Development at Wikipedia - http://bit.ly/9Aa3Xr
  • 39. PHPUnit - http://www.phpunit.de/
  • 40. Xdebug - http://www.xdebug.org/
  • 41. 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 </li></ul>
  • 42. Thanks! <ul>[email_address] @JeremyKendall http://jeremykendall.net </ul>

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