Configure the peridot test directory

peridot.php

<?php

use Evenement\EventEmitterInterface;

/**
 * Configure peridot.
 *
 * @param EventEmitterInterface $eventEmitter
 */
return function (EventEmitterInterface $eventEmitter) {
    $eventEmitter->on('peridot.start', function (\Peridot\Console\Environment $environment) {
        $environment->getDefinition()->getArgument('path')->setDefault('specs');
    });
};