We shouldn't be relying on the MWS resource creation functionality to work to test the next methods.

Alternatively, we can use [mocks](https://en.wikipedia.org/wiki/Mock_object) on the DB methods ([some additional motivation](https://en.wikipedia.org/wiki/Unit_test#Separation_of_interface_from_implementation)).

This is also relevant for our resource creation above (we shouldn't be actively editing the database).