refs https://github.com/TryGhost/Team/issues/1115
This allows users to create Offers for Tier/Cadence pairs in order to
provide discounted subscriptions to Members! We have support for
percentage based discounts & fixed price discounts, either for the first
payment, all payments, or a number of monthly payments.
Offers also have a code, which can be used as an easy way to share them,
as visiting https://site.com/offer-code will automatically open Portal
with the Offer prepopulated.
- 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 frontend tests with the frontend code
