Laravel 8 Model Factory resolver

TestCase.php

<?php

namespace Tests;

use Illuminate\Database\Eloquent\Factories\Factory;
use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;
use ReflectionClass;
use SplFileInfo;

abstract class TestCase extends BaseTestCase
{
    use CreatesApplication;

    protected function setUp(): void
    {
        parent::setUp();

        $factoryFiles = collect(File::allFiles(database_path('factories')));
        Factory::guessFactoryNamesUsing(function ($modelName) use ($factoryFiles) {
            return $factoryFiles->map(function (SplFileInfo $splFileInfo) {
                return 'Database\\Factories\\' .
                    str_replace(
                        '/',
                        '\\',
                        Str::between($splFileInfo->getPathName(), database_path('factories/'), '.php')
                    );
            })
                ->filter(function (string $className) use ($modelName) {
                    $factory = new $className;
                    $reflection = new ReflectionClass($className);
                    $property = $reflection->getProperty('model');
                    $property->setAccessible(true);

                    return $property->getValue($factory) === $modelName;
                })
                ->first();
        });
    }
}