How to run a single seeder during unit test?

I can't get it to work. I set basepath and seeder as per the documentation and get the following errors:
The seeders are in project/tests/_support/Database/Seeds/
tests/_support/Database/Seeds/TestSeeder.php:

PHP Code:

<?php

namespace Tests\Support\Database\Seeds;

use CodeIgniter\Database\Seeder;

class TestSeeder extends Seeder
{
    public function run()
    {
        $this->call('RolSeeder');
        $this->call('UsuarioSeeder');
    }
} 


With:

PHP Code:

protected $seed = 'TestSeeder';
protected $basePath = 'tests/_support/Database'; 


I get:

Code:

1) App\Controllers\UsersTest::testCreateUsuarioNuevo                                                                                          Error: Class 'App\Database\Seeds\TestSeeder' not found

With:

PHP Code:

protected $seed = 'TestSeeder';
protected $basePath = '/tests/_support/Database'; 


I get:

Code:

1) App\Controllers\UsersTest::testCreateUsuarioNuevo                                                                                                          InvalidArgumentException: The specified seeder is not a valid file: /tests/_support/Database/Seeds/TestSeeder.php

I'm running PHP 7.4.33 on wamp64 and CodeIgniter 4.2.11.