Testing Client library

Is there a way to use Gatling to test client library?

In my test, there is a REST API service and a client library. The client library gets the JSON response from the service and then converts to a Java object to be consumed by the other project,

I have tested API service using Gatling and also preparing for load testing

But how do I test the client library? The developer have unit test but is there a way to test it via gatling?