Laravel Storage and Parallel Testing - Storage Facade

Illuminate\Support\Facades\Storage.php

<?php

// ...

public static function fake($disk = null, array $config = []) {
    $disk = $disk ?: static::$app['config']->get('filesystems.default');

    (new Filesystem)->cleanDirectory(
        $root = storage_path('framework/testing/disks/'.$disk)
    );

    static::set($disk, $fake = static::createLocalDriver(array_merge($config, [
        'root' => $root,
    ])));

    return $fake;
}

// ...