crystoline/xpsr-router-fastroute
FastRoute adapter for XPSR's portable route definitions. This is the default adapter in the crystoline/xpsr skeleton.
composer require crystoline/xpsr-router-fastroute
Select it with ROUTER_ADAPTER=fastroute, or run php xpsr setup --router=fastroute. Route files stay the same whichever adapter you choose.
The adapter passes XPSR's shared router contract suite (Crystoline\Xpsr\Testing\RouterContractTestCase):
composer install
vendor/bin/phpunit