Behaviour Driven Development in WordPress

slid.es/tmf/bdd-wp

Automated Tests in WordPress

• make.wordpress.com: test suite
• Great presentation by @ptahdunbar
• wptest.io great test data set

Unit Tests

• 1 test per "unit"
  most common example: Calculator
• prepare testing environment
• set up your object (i.e. instantiation)
• mock dependencies
• execute
• assert result

WordPress & Dependencies

Calculator

A more suitable testing approach: BDD

• Dan North introduced BDD in 2006 
• TDD problems: where should we start, what and
  how should we test?
• Describe the features in a common language
  understood by all stakeholders: clients, PMs, Devs...
• Prioritize features by business value
• Describe the desired and undesired behaviours of these features with scenarios (examples)
• Use these stories as a recipe for automated tests
• Implement the features

Gherkin

The common language for

describing features and scenarios

Feature: Read published blog posts
    In order to published read blog posts
    As a reader
    I need to be able to see a list of published posts and read each post individually

    Background:
        Given there are posts
            | post_title      | post_content              | post_status | post_author |
            | Just my article | The content of my article | publish     | 1           |
            | My draft        | This is just a draft      | draft       | 1           |

    Scenario: List my blog posts
        Given I am on the homepage
        Then I should see "Just my article"
        And I should not see "My draft"

    Scenario: Read a blog post
        Given I am on the homepage
        When I follow "Just my article"
        Then I should see "The content of my article"

Mink: browser abstraction

Missing Link: WordPress Extension

A Behat Extension for common WordPress tasks in feature descriptions

Demo

• Plugin Example:
  https://github.com/tmf/bdd-plugin-example
• Reusable Service for plugins and themes:
  https://github.com/tmf/wp-metabox-helper

Read more:

• https://knpuniversity.com/screencast/behat/intro
• Behat 2.x WordPress Context by Walter Dal Mut
  http://walterdalmut.com/2014/04/06/bdd-wordpress-behat-extension/

Thanks!