问无法在Laravel 7找到工厂

EN

<?php

namespace Tests\Unit;

use Illuminate\Foundation\Testing\DatabaseMigrations;
use PHPUnit\Framework\TestCase;

class ThreadTest extends TestCase
{
    use DatabaseMigrations;



    public function test_a_thread_has_replies()
    {

        $thread = factory('App\Thread')->create();

        $this->assertInstanceOf('Illuminate\Database\Eloquent\Collection', $thread->replies);
    }
}

<?php

/** @var \Illuminate\Database\Eloquent\Factory $factory */

use App\Thread;
use Faker\Generator as Faker;

$factory->define(Thread::class, function (Faker $faker) {
    return [
        'user_id' => factory(App\User::class),
        'title' => $faker->sentence,
        'body' => $faker->paragraph
    ];
});