Use a preconfigured service provider to test your own Identity Provider (IdP).

You only need Docker and Docker-Compose.

cp docker-compose.override.yml.example docker-compose.override.yml
# Now edit your docker-compose.override.yml file with proper info about IdP
docker-compose build
docker-compose up -d
docker-compose exec sp composer install

Then access http://localhost:8000. You should be able to see the default page.

If you need to change something, take a look at settings.php

You must configure your IdP with whatever of these info they ask:

• The service name is SP test
• The return URL is http://localhost:8000/acs.php
• The metadata URL is at http://localhost:8000/metadata.php
• The login URL is at http://localhost:8000/login.php

After everything is configured, just start SAML flow on http://localhost:8000/login.php and you are ready to go. You should be redirected to your IDP_SSO_URL and after authentication, you should be redirected back to /acs.php and be able to see info about user.