Good tutorials on WordPress + phpunit
- https://make.wordpress.org/core/handbook/testing/automated-testing/phpunit/
- https://deliciousbrains.com/unit-testing-ajax-api-requests-wordpress-plugins/
- https://carlalexander.ca/introduction-wordpress-unit-testing/
- https://developer.yoast.com/unit-testing-wordpress-plugins-with-phpunit-in-phpstorm/
- https://www.smashingmagazine.com/2017/12/automated-testing-wordpress-plugins-phpunit/
- https://pippinsplugins.com/unit-tests-wordpress-plugins-setting-up-testing-suite/
- https://torquemag.io/2018/05/advanced-oop-for-wordpress-part-5-using-the-wordpress-test-suite-for-integration-testing/
- https://torquemag.io/2018/08/advanced-oop-for-wordpress-part-7-refactoring-is-an-opportunity-to-adopt-test-driven-development/
- https://torquemag.io/2018/08/advanced-oop-for-wordpress-part-8-developing-new-features-for-extensible-wordpress-plugins-using-test-driven-development/