Quick introduction to the behaviour driven development and the Behat bundle for Symfony 2

1. Behaviour Driven
Development
Testing with Behat

2. Kate Lanyon
Business Analyst @ elabor8
PHP, Symfony, iOS developer
Agency / Start up background
@katalisha

3. Introduction to BDD
Requirements & tests in natural language
Adds a structure to Test Driven Development
Collaboration between developers and non-techies
Driven by business value (outside-in)

4. Writing Tests is Hard
What should I test?
How should I name this test?
What is a unit?
Where do I start

5. Write Behaviours Instead
Describes a Feature
Includes Scope
Assists Prioritisation
Can be Estimated
Common definition of
“Done”

6. Example: ATM

7. Behat: BDD for PHP
Inspired by Ruby Cucumber & Gherkin
PHP 5.3
Built on Symfony 2 Components
Standalone
Plugin for symfony 1.4
Bundles for symfony 2

8. More Behat
Define a feature
Define a scenario
Run tests - fail
Build feature
Run tests - success

9. Define a Feature
Feature:
In Order to [A] A - The business value
As a [B] B - The persona
I need to [C] C - Description of
feature

10. Define a Feature - Example
Create features/ls.feature

11. Define Scenarios
Scenario
Given [D] D - The initial context
When [E] E - A user or other
event
Then [F]
F - What should
happen (acceptance
criteria)
As many as needed to describe the feature

12. Define Scenarios - Example

13. fail

14. Steps: The Secret Sauce
Code
Regex to grab test values
Use any assertion tool (PHPUnit, PHP Exceptions)

15. Steps
Acceptance tests go here in code
Passed
Pending - BehatBehatExceptionPending
Undefined
Ambiguous
Failed - Exception()
Skipped - following a non-passing step

16. Example

17. Behat Symfony Bundle
Install behat & gherkin
Install behat bundle
app/console -e=test behat --init @AcmeDemoBundle
app/console -e=test behat @AcmeDemoBundle
app/console -e=test behat -dl @AcmeDemoBundle

18. Resources
http://docs.behat.org/quick_intro.html
http://dannorth.net/whats-in-a-story/
http://symfony.com/video/Paris2011/576
http://www.odino.org/378/behaviour-driven-development-in-php
http://docs.behat.org/cookbook/
bdd_in_symfony2_with_behat_mink_and_zombiejs.html
https://github.com/katalisha/behat-tutorial