Slice your PHPUnit test suite in chunks to run it in parallel.
Install phpunit-slicer using Composer:
composer require --dev wizaplace/phpunit-slicer
Instead of running your test suite with vendor/bin/phpunit, run phpunit-slicer instead:
vendor/bin/phpunit-slicer --slices 1/2
The --slices allows to define how many slices to use and which one to run. For example 1/2 means that the test suite will be split in 2, and only the first slice will be run.
PHPUnit-slicer is mainly useful for continuous integration: it allows to run a large test suite in parallel accross several jobs. To enable this, simply replace your single PHPUnit job with 2 (or more) jobs:
vendor/bin/phpunit-slicer --slices 1/2vendor/bin/phpunit-slicer --slices 2/2
This project is released under the MIT license.