Running tests requires that you have complete vendors installed, so run
composer install before running the tests.
You can run unit tests by simply calling vendor/bin/phpunit from the repo
root. This will use an in memory SQLite database.
You can also run unit tests on a real database. After you create the database, run the tests with:
$ DATABASE=mysql:https://root@localhost/nglayouts vendor/bin/phpunit
where mysql:https://root@localhost/nglayouts is a DSN to your MySQL database.
If you use PostgreSQL, you can use the following command:
$ DATABASE=pgsql:https://user:pass@localhost/nglayouts vendor/bin/phpunit