Getting Started with Unit Testing
A bit about me
- SFNdesign <- my agency
- running it for 6 years
- WordPress eCommerce and Membership
- usually high scale stuff with lots of externals
- curtismchale.ca <- personal site (business topics)
- WP Theme Tutorial <- dev centric WP topics
What is Unit Testing
Only PHPUnit today use QUnit for JS testing
Why would I write tests?
image via: nukamari
Really Why!
Saves Time - old workflow
- write code
- browser
- add data
- save
- check for output (WP_DEBUG on!)
- click around to check other stuff
- deal with clients finding problems later
Saves time - New Workflow
- write a test for your code
- write the code
- run your tests
- check results
- move on
Save time - New code
Remember Curtis M
make sure it doesn't break old code
Save Time - Refactoring Safely
make it better without breaking
Save Time - Initial Costs
Yes it does take a bit longer to start
but all those long term benefits
Simpler Testable Code
- higher number of smaller functions
- no more monolithic 900 line functions with logic, templates...
Provides some docs
Future developers can use the tests on code they don't know
Test First or last?
Pure TDD says write first
Write last is Regression Testing
Tools of the trade
PhPunit
This is a unit testing framework for WordPress
- $this->assertTrue( $a === $b );
- $this->assertArrayHasKey( 'foo', array( 'foo' => 'bar' ) );
- $this->assertNull( NULL );
- PHPUnit Docs
WP_Unittestcase
WordPress API that extends PHPUnit
WARNING: Don't run the core tests on a live or dev site
WP_Unittestcase
setUp & tearDown
WP_unittestcase
post creation
WP_Unittestcase
users
Mock roles for plugins like WooCommerce
WP_unittestcase
term creation
WP_Mock
Alternative to the WordPress->factory
Mimics the WordPress API
- functions
- filters
- actions
- install with Composer
WP_Mock
- more abstract
WP_CLI
It's simply awesome so use it
Can build out your starting tests for a plugin
wp scaffold plugin-tests $pluginname
VVV
WHOA that's a lot of stuff!!!
Just use VVV as your dev environment
Nope:
For Windows use Composer
All the windows stuff I found said use PEAR
Travis-ci
Continuous Integration
- checks branches
- checks pull requests
Now Meet c. McHale
image via: great8
Some basic principles
- test success
- test failures
- test the 'public' API
- cover as much as possible
More Code Time
RCP Email Passwords
Emails passwords to users imported by RCP CSV Import
WordPress Test Patterns
- register_post_type returns WP_Error
- use has_cap to write a new cap test
Questions???
Resources: Presentations
Resources: Books
Resources: Blog Posts
- WP_UnitTestCase: The hidden API
- Unit Testing for WordPress Plugins: The Right Way
- How to add Unit Testing and continuous Integration to your WordPress plugin
- Test Driven PHP
- Series by Tom McFarlin on Unit Testing 1, 2, 3
Getting Started with Unit Testing
By curtismchale
Getting Started with Unit Testing
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