[8.x] Update the ParallelRunner to allow for a custom Runner to be resolved

[lukeraymonddowning]

Howdy all!

This PR comes on the back of a new requirement for Collision, in which we want the ability to define the Paratest Runner that should be used under the ParallelRunner.

This allows for the following syntax:

\Illuminate\Testing\ParallelRunner::resolveRunnerUsing(fn($options, $output) => new CustomRunner($options, $output));

When a resolver is defined, the runner will be returned based on the provided resolver logic. When a resolver is not defined, the runner will be returned using the default WrapperRunner currently used.

Thanks for all the hard work and for continuing to maintain the framework.

Kind Regards,
Luke

[LastDragon-ru]

How it is supposed to work? I've tried

1. Calling it in AppServiceProvider
2. Adding it into bootstrap.php and phpunit.xml
3. Adding it into bootstrap/app.php

nothing work :(