Call to a member function connection() on null Laravel 5.4

Question

Try write a unit test and i need do sql query

class UpdateThrowsTest extends TestCase
{

protected $bgame;
protected $game_id = 95;

public function setUp()         


        

Answer 1

I had this error on laravel 7 (nothing worked even php artisan serve) and fixed it with

composer dumpautoload 

Before that update my vendor with composer update and then everything worked fine.