You should be able to clone the project, then execute
mvn jetty:run
From your browser visit http://127.0.0.1:8080/application
which is a sample demo website that wants to call 3 of your apis
click on top menu "Authorise" will direct you to the demo oauth2 server to permit access to some or all 3 of the apis you provide. You then go back to demo website with a token which is then used to get an access_token to call the apis.
To run the integration tests /mvn clean package jetty:start failsafe:integration-test
the tests show calling the api's to the auth code, access token with limited scope and calling the final demo api.