我正在为这个项目进行测试覆盖，现在我需要创建一个用户模型工厂。
我使用artisan命令创建了这个工厂：php artisan make:factory UserFactory
在调用User::factory()->create();后，我得到了下一个错误：

SQLSTATE[HY000]: General error: 1364 Field 'username' doesn't have a default value (SQL: insert into `admin_users` (`updated_at`, `created_at`) values (2023-01-01 10:00:00, 2023-01-01 10:00:00))

工厂代码：

<?php

namespace Database\Factories;

use Illuminate\Database\Eloquent\Factories\Factory;

class UserFactory extends Factory
{
    public function definition(): array
    {
        return [
            'username' => $this->faker->unique()->userName,
            'password' => bcrypt('password'),
            'name' => $this->faker->name,
            'avatar' => $this->faker->imageUrl(),
            'email' => $this->faker->unique()->safeEmail
        ];
    }
}

用户型号代码：

<?php

namespace App\Models;

use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class User extends Model implements AuthenticatableContract
{
    use Authenticatable, HasFactory;

    ...

    protected $fillable = [
        'username',
        'password',
        'name',
        'email',
        'avatar'
    ];

    ...
}

我尝试将受保护的属性设置为protected $guarded = []。
没用的项目中的其他工厂工作正常
UPD 1：User::create()方法得到了相同的错误。但下一个代码可以工作：

$user = new User();
$user->username = 'Test';
$user->password = Hash::make('test');
$user->name = 'Test';
$user->email = 'test@test.com';
$user->save();