In upcoming commits, we will introduce a new migration stream package
that will need to reference the db package, as well as the accounts,
session and firewalldb package in future commits. To avoid circular
dependencies, we therefore introduce a new migration stream that unit
tests can use, in order to avoid having to import the new migration
stream package.
We add a helper function to the functions that creates the test SQL
stores, in order to ensure that the store is properly closed when the
test is cleaned up.
In preparation for upcoming migration tests from a kvdb to an SQL store,
this commit updates the NewTestDB function to return the Store interface
rather than a concrete store implementation.
This change ensures that migration tests can call NewTestDB under any
build tag while receiving a consistent return type.
This commit adds the SQL implementation of the session.Store interface.
This can be run against all session unit tests via `make unit
pkg=session tags=test_db_sqlite` and `make unit pkg=session
tags=test_db_postgres`.
