Add missing test for trial service SMS usage
Add missing test for trial service SMS usage

This is pretty much impossible with the current query because it
filters on columns in the joined ft_billing table [^1]. However,
as we look at consolidating these queries it makes sense to have
an existing test we can tweak - like we have for orgs [^2].

[^1]: https://github.com/alphagov/notifications-api/blob/c4c9171cbaf27facb9f989e91d9741a94f19ce2e/app/dao/fact_billing_dao.py#L104
[^2]: https://github.com/alphagov/notifications-api/blob/c4c9171cbaf27facb9f989e91d9741a94f19ce2e/tests/app/dao/test_fact_billing_dao.py#L1000

alphagov/notifications-api,alphagov/notifications-api