firefly-iii/database/factories/AccountFactory.php

<?php
declare(strict_types=1);

namespace Database\Factories;

use FireflyIII\Enums\AccountTypeEnum;
use FireflyIII\Models\AccountType;
use Illuminate\Database\Eloquent\Factories\Factory;

class AccountFactory extends Factory
{
    public function definition(): array
    {
        return [
            'name' => $this->faker->name(),
            'active' => true,
        ];
    }

    public function withType(AccountTypeEnum $type): static
    {
        return $this->for(AccountType::where('type', $type->value)->first());
    }
}