BDD with Behat

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Richard Shank

A talk I gave at pdxphp about using Behat for Behavior Driven Development

Technology

Who am I? Richard D Shank [email_address] @IamPersistent Freelancer Symfony2 developer Wanna be rock star

What is BDD? Behavior Driven Development

Testing We know we should do it, why don't we? ,[object Object]

TDD Test written before code ,[object Object]

BDD What makes it different? Its written from the outside in, driven by the business value

BDD How does it work? You tell a story When a customer clicks on a blue widget, it is added to their shopping cart.

It is written in everyday, spoken language

Makes everyone think about the requirements

It keeps you focused on what is necessary - YAGNI

Installation $ pear channel-discover pear.everzet.com $ pear install everzet/behat-beta

Step 2 – Object Definition Steps are generated Calculator.php

Step 2 – Object Definition *Writing a stub class is not really the BDD way of doing things, PHP doesn't handle 'method not found' exceptions very well, so the stub class is necessary for PHP

Step 2 – Step Definition steps/calculator.php

Wash, rinse, repeat Keep repeating the process until all tests pass.

Behat is a tool that makes behavior driven development (BDD) possible. With BDD, you write human-readable stories that describe the behavior of your Drupal site. These stories can then be auto-tested against your website, whether in the midst of development, or on a live site. And yes, it’s as cool as it sounds! Behat, if embraced by enough Drupal folks, has the potential to vastly improve the way we build and test Drupal websites. Testing language can be developed by module maintainers, and allow nearly codefree testing to be developed by everyone, as needed, per site. Behat IS NOT unit testing nor a specification testing tool. Behat is a Scenario-oriented BDD framework with functional testing capabilities as part of a communication process between stake-holders and developers. Think Agile User Stories meets Selenium. Behat is currently used to test Drupal.org, allowing a variety of coders to work on a single site, and ensure that no existing functionality will break as they add new features. Or as it's migrated from one version to another. Imagine that on your site. We will review Behat (and Mink, and related code), how to use it with Drupal, Drush, and the existing modules/code to support that. We will demo live testing, and so how easy it is to write tests, with and without code.

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BDD with Behat

1. BDD with Behat

2. Who am I? Richard D Shank [email_address] @IamPersistent Freelancer Symfony2 developer Wanna be rock star

3. What is BDD? Behavior Driven Development

4. What is BDD? What does that mean?

6. It slows me down

7. The boss won't let me

8. I'm not really sure how

10.

11. It carries the bias of our code

12. Its just too much trouble

13. TDD Solution: Test Driven Development

14.

15. You know the test will be written

16. TDD What the hell do I test?

17. BDD Behavior Driven Development

18. BDD What makes it different? Its written from the outside in, driven by the business value

19. BDD How does it work? You tell a story When a customer clicks on a blue widget, it is added to their shopping cart.

20.

21. It is written in everyday, spoken language

22. Anyone can understand and write stories

23. Makes everyone think about the requirements

24. It keeps you focused on what is necessary - YAGNI

25. Gherkin

26.

27. Uses Gherkin syntax

28. 6 step process

29. PHP 5.3

30. Installation $ pear channel-discover pear.everzet.com $ pear install everzet/behat-beta

31. File organization

32. Step 1 - Behavior addition.feature

33. Step 2 – Object Definition Steps are generated Calculator.php

34. Step 2 – Object Definition *Writing a stub class is not really the BDD way of doing things, PHP doesn't handle 'method not found' exceptions very well, so the stub class is necessary for PHP

35. Step 2 – Generate Steps

36. Step 2 – Step Definition steps/calculator.php

37. Step 2 – Add support support/env.php

38. Step 3 - Write a definition

39. Step 4 – Run it, watch it fail

40. Step 5 – Write the code

41. Step 6 – Run it, watch it pass!

42. Wash, rinse, repeat Keep repeating the process until all tests pass.

43. Write step for add

44. Watch it fail

45. Write the code

46. Watch it pass

47. Write step for result

48. Watch it fail

49. Write the code

50. Watch it pass

51. Unit Testing Does not replace unit testing, It supplements it

52. More complex

53. Scenario Outlines

54. Backgrounds

55. Hooks

56. In-step calls

57. New feature

58. Learn more http://en.wikipedia.org/wiki/Behavior_Driven_Development http://blog.dannorth.net/introducing-bdd https://github.com/aslakhellesoy/cucumber/wiki http://cukes.info http://everzet.com/Behat https://github.com/everzet/Behat http://www.pragprog.com/titles/achbd/the-rspec-book http://scotland-on-rails.s3.amazonaws.com/1A06_JosephWilk-SOR.mp4

BDD with Behat

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