LoginTest.php

<?php

namespace Tests\Feature;

use Tests\DuskTestCase;
use Laravel\Dusk\Concerns\ProvidesBrowser;

class LoginTest extends DuskTestCase
{
    use ProvidesBrowser; // 1. Import this trait to your test
  
    public function tearDown()
    {
        parent::tearDown();
        
        static::closeAll(); // 2. And put this line
    }
  
    // your tests goes here
}