tripal_blast/tests/DatabaseSeeders/UsersTableSeeder.php

<?php

namespace Tests\DatabaseSeeders;

use StatonLab\TripalTestSuite\Database\Seeder;

class UsersTableSeeder extends Seeder
{
    /**
     * Seeds the database with users.
     */
    public function up()
    {
        $new_user = [
            'name' => 'test user',
            'pass' => 'secret',
            'mail' => 'test@example.com',
            'status' => 1,
            'init' => 'Email',
            'roles' => [
                DRUPAL_AUTHENTICATED_RID => 'authenticated user',
            ],
        ];

        // The first parameter is sent blank so a new user is created.
        user_save(new \stdClass(), $new_user);
    }
}