withoutFaker.php

<?php

...

public function it_can_store_a_zipped_game_file()
{
  //   Storage::fake('games');
  
  $slug = "my-game";
  $gameFile = UploadedFile::fake()->create('foo.zip', '800');

  Game::storeZippedGame($gameFile, $slug);

  Storage::disk('games')->assertExists("my-game");
  //   Delete the directory manually!
  Storage::disk('games')->deleteDirectory('my-game');
}