- this is a small part of a bit of cleanup of our test files
- the goal is to make the existing tests clearer with a view to making it easier to write more tests
- this makes the test structure follow the codebase structure more closely
- eventually we will colocate the tests as we break the codebase down further
refs https://github.com/TryGhost/Team/issues/1083
The Offers service is going to need access to the StripeAPIService too,
so we need to move it out of the @tryghost/members-api module and make
it accessible to both.