Asserting File Downloads

This short lesson is about a rarely used assertion for file downloads.

In the Controller, you have a method where the response is to download a file.

use Symfony\Component\HttpFoundation\BinaryFileResponse;
 
class ProductController extends Controller
{
    // ...
 
    public function download(): BinaryFileResponse
    {
        return response()->download(storage_path('files/product-specification.pdf'));
    }
}

How can you test if this download was successful and if the download returned that exact file name to the browser?

In the test, you can assert the...