Learn how to set up Playwright for WordPress E2E testing and write tests using real-world examples so you have a solid foundation to adapt for your own project.
PHPUnit tests for HTML output are fragile. Attribute order changes, a trailing semicolon, and suddenly tests fail — even though the browser renders the same thing. WordPress 6.9 adds assertEqualHTML() to WP_UnitTestCase. It compares HTML semantically, so only real differences cause failures.
This tutorial shows WordPress plugin developers how to add automated unit testing from setup to GitHub integration. Learn to catch bugs before users do, prevent regressions in stable code, and build confidence across different WordPress versions and configurations.