About tests, referring to integration tests, I am asking if I should first refactor them as you have suggested in a comment above?

Moving them in a separate submodule before starting to solve this issue seems the most sensible thing to do to me.

Running test using maven in powershell leads to an error: gist

This is a successful build. The error you see at the end is caused by the embedded MongoDB when closing.
We didn't find a way yet to avoid it. But You can see that the maven build result is successful and the test result does not contain any failures or errors.

In all the other cases it seems you are running profiles that you shouldn't run and it is looking for external server. Probably something is wrong in your IDE configuration. Alternatively you can install the servers and setup the environment variables as described in the README.