xshop/database/seeders/InvoiceSeeder.php

<?php

use Illuminate\Database\Seeder;

class InvoiceSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        factory(\App\Invoice::class,10)->state(\App\Invoice::COMPLETED)->create();
    }
}