Calling Laravel Seeder inside folder

I've upgraded to Laravel 8, but my custom seeder in a subdirectory is not working. The file is at database/seeders/tests/TestSeeder.php.

When I run the command php artisan db:seed --class="TestSeeder" it return an error message:

Target class [Database\Seeders\TestSeeder] does not exist.

Seeder

<?php

namespace Database\Seeders\Tests;

class TestSeeder extends BaseSeeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
       // codes
    }
}

composer.json

"autoload": {
    "psr-4": {
        "App\\": "app/",
        "Database\\Factories\\": "database/factories/",
        "Database\\Seeders\\": "database/seeders/",
        "Database\\Seeders\\Tests\\": "database/seeders/tests/"
    }
},

Laravel assumes you are running a seeder from the Database\Seeders\DatabaseSeeder class. If you provide an unqualified class name such as TestSeeder, it will assume you mean the Database\Seeders\TestSeeder class.

So, you should specify the fully qualified class name.

php artisan db:seed --class="Database\\Seeders\\Tests\\TestSeeder"