La classe cible [] n'existe pas.
composer dump-autoload
Illuminate\Contracts\Container\BindingResolutionException la cible calss n'existe pas
Routing namespaces have been updated on Laravel 8.X
On your router, you should define:
use App\Http\Controllers\TestController;
And then, declare:
Route::get('test',[TestController::class, 'test']);
Illuminate\Contracts\Container \ BindingResolutionException La classe cible [SlugController] n'existe pas.
Route::get('/test/{slug}', 'App\Http\Controllers\SlugController@show' );