SeedDatabase trait along with SeedDatabaseState class gives your Laravel project the ability to seed the testing database once before running the full suite tests, which improves the speed of the tests than seeding the testing database before each test.
Also, it has the option to run custom seeders instead of the seeders that are called in the run() method of the DatabaseSeeder class you can achieve that as follows
...in the Testcase.php
public function setUp()
{