Add integration tests

[kptdobe]

The project is tested via "unit tests"-like but the running service under development is never tested.

One example: the PR #379 was green but a first use of the service revealed that some configurations are missing.

We have everything in-place (via a CI version of the service being deployed) to run tests against that service and make sure the API contract of the service is respected (and still respected).

This is slightly different from #89 which would be the next logical step where we run tests against the service with real test project consuming the service.
#89 would covers parts of the current issue but having the infrastructure and processes to have clean testing per service should still be a target.

[creatorpiyush]

Can I take this issue if no one is working on it?