I'm having trouble finding out the answer to this..
I'm exposing an endpoint, JSON data is being sent to it.
Inside my service I'm then mapping this to a POJO, serialising to a JSON request, then firing that on to my service via OpenFeign (internal service within company).
Should I be mocking everything in terms of the response? Or are contract tests meant to test this integration?
Currently I am analysing the actual response from the service I'm calling.
On the producer side, your controller should have all the services mocked. It means that it will not call a database nor another service to get back the response. What you should do is to create a simple controller object and inject fake / mocked services that will return fixed responses. Contract tests are about checking if you can communicate, not about checking if the functionality is working fine.