Testing "get" for uploaded images

Hi.

Following problem I can't get my head around:

...
$this->get('https://laravel.com')->assertOk(); // OK
$this->get('https://laravel.com/img/logotype.min.svg')->assertOk(); // 404
...

I just want to test, that my uploaded images are accessible via their URLs. First I thought I made a mistake when the second line didn't work for my public uploads, but it doesn't work for any image URL on the internet. Even so all URLs I tried are accessible using the browser.

What am I doing wrong?

Cheers