PHPUnit is a testing framework for PHP that can be used to write and run unit tests for WordPress. Here are the general steps to set up and run PHPUnit tests on a WordPress website:

Install PHPUnit:

You will need to have PHPUnit installed on your server in order to run the tests. You can install it via composer or by downloading the PHAR file.

Install WordPress testing library:

You will also need to install the WordPress testing library, which provides the necessary functions and classes to run the tests. You can install it via composer or by downloading the library from the WordPress repository.

Create a test case:

To create a test case, you will need to extend the WP_UnitTestCase class and write test methods for the functionality you want to test.

Configure the test environment:

You will need to configure the test environment by setting up a test database and defining the test configuration in a bootstrap file.

Run the tests:

Once you have set up the test environment, you can run the tests by running the phpunit command from the command line.

Automate the process:

You can automate the process by using a plugin like WordPress Test Suite that allows to run the tests automatically on each change on the codebase.

It’s important to note that creating unit tests for WordPress can be a bit more complex than for other PHP projects, as it requires some knowledge of the WordPress codebase and architecture.

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