https://github.com/solid/node-solid-server#testing-solid-loc...
> In order to really get a feel for the Solid platform, and to test out solid, you will need the following:
> 1. A WebID profile and browser certificate from one of the Solid-compliant identity providers, such as solid.community.
EDIT: Seems if you run `solid init` and accept the defaults, it will configure a local WebID provider that you can register to on first use.