You need to convert the test.svs file into a deepzoom format
First, install python 3.8 or greater, then run the script below
sudo apt update
sudo apt install -y openslide-tools python3 python3-openslide
python3 deepzoom_tile.py test.svs
This allows for the index.html to fetch the appropriate files.
Then, all you need to do is start your own http server in this folder
python3 -m http.server