Setting up Unit Testing for WordPress Core

Recently I was running into issues with VVV running some units tests for AJAX. I was not able to remedy the issue so I decided to create a testing environment from the SVN repo directly.

I went to the page on the codex and while the information there was great, part of the instructions are to setup a different database for your tests but not how to get mysql setup and ready for anything to connect to it.

After a bit of digging around I found a simple approach for setting up a test suite for WordPress core unit tests. This setup does not account for viewing WordPress in a browser it was really only meant for unit testing but you could easily set that up as well if required.

Using homebrew, install mysql

Once installed, start the server

Once the server has started you can login using the default user (root) and password (blank)

You may be prompted for a password  if so, just hit enter.

Now you can create the tables as needed. There are two commands here because we need a database for WordPress regular use and one for unit testing because the test suite will drop all of the tables in the database each time it’s run.

That’s it! Now your databases are all setup to use.

Next, checkout the WordPress repo into your user folder and change to that directory

Now edit the wp-config.php and wp-test-config.php adding in the appropriate database connection info for each.

I found that I needed to set the DB_HOST constant to instead of localhost to have the connection work.

If everything is setup correctly, you can run the unit test suite from inside the root of the core repo.

Once you’re done with your testing you stop the mysql server as it can cause conflicts with other tools that use their own mysql installations.

That’s it! Happy unit testing!