One of the laptops has a FreeRADUS instance that is configured as an Identity Provider.

There is a user defined in /etc/freeradius/users

Username: steve@example.com
Password: testing

FreeRADIUS is configured to return a SAML authentication assertion in the post-auth section of sites-available/default.

Any RADIUS client using a secret of testing123 in 192.168/16 will work (see /etc/freeradius/clients.conf)