Unit Test in WordPress

Take a look at the WordPress core setup with PHPUnit: https://make.wordpress.org/core/handbook/testing/automated-testing/phpunit/

Using this process rather than rolling your own allows you to leverage the boostrapping (and other customization) specific for WordPress.

From the Codex:

When phpunit is invoked, the test suite runs a script that sets up a
default installation of WordPress, with a configuration similar to
what you get with the GUI install. Before any tests are run, the
following steps take place:

  • WordPress is bootstrapped (by including wp-settings.php). This means that all tests run after the entire WP bootstrap (through wp_loaded).
  • All default content is deleted. This includes sample posts and pages, but does not include the default user or the ‘Uncategorized’ category.

Hope that helps!

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