As mentioned in the contributing guidelines document, all pull requests related to new features or bug fixes should contain relevant tests, that pass.
In order to write tests for this project, you'll need to know how it's built and how it expects unit tests to be written and executed.
To run the tests, you will need to make sure you have all the dependencies available:
$ cd /path/to/cakephp-cache-engines
$ composer install
You are now ready to run the tests:
$ bin/phpunit test
The tests can also be ran using Docker with the following commands:
$ make start-build
$ make run-composer-install
$ make run-unit-tests