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Yoast SEO Development: Set up integration tests

When running integration tests we have to set up some WordPress Docker containers. This allows us to test against WordPress, which is the 'integration' part. An added bonus of this is that you also have a separate setup for writing patches and unit tests.

Clone the repository

Clone WordPress/wordpress-develop.

Expose MySQL port

After cloning has been done, you have to expose the MySQL port, which allows us to connect to it later on.

In wordpress-develop, open the docker-compose.yml file and change:

- "3306"


- "3306:3306"

This will expose the port to the local environment.

Edit your hosts file

Edit your hosts file by running sudo nano /etc/hosts in your terminal and add the following: localhost mysql

Making your database accessible

To make your database accessible, run the following command:

sudo ifconfig lo0 alias

Tying it all together

The last step is to tie it together with your wordpress-seo cloned repository.

To do this, please ensure you've followed the steps regarding setting up PhpUnit.

Spin up the containers

If you've gone through all the above steps, it's time to start the containers!

In your terminal, run the following commands:

npm install
npm run build:dev
npm run env:start
npm run env:install

When you want to stop the containers, you simply can do:

npm run env:stop

Accessing the admin

Before running the tests, you will need to access the admin of this testing environment, to activate Yoast SEO to ensure all the necessary database tables are created.

By default, the credentials to access the WordPress admin, are:

  • Host - http://localhost:8889/wp-admin
  • Username - admin
  • Password - password

Accessing the database

In case you need to access the database to check something (i.e. whether or not all database tables have been created), you can use the following credentials in your database tool of choice:

  • Host -
  • Username - root
  • Password - password
  • Database - wordpress_develop
  • Port - 3306


If you get errors about the database connection, make sure other no MySQL processes are running in the background by running brew services stop mysql in your terminal.