tests: write unit tests for all endpoints

[90-008]

todo: fill all endpoints here as todos

[90-008]

First we need to add an in memory DB (sled with temporary on should be good). We also need to write a macro that will setuo the db, setuo mock transport and return a client that one can use to perform the requests.

[90-008]

This is already done and we now have a unit_test macro.