closes https://github.com/TryGhost/Team/issues/1125
refs 3c822e0457
- Email-only is not considered a general availability feature and can be used without special flags.
- It allows to publish a new post type "email only" that only goes out as an email newletter and is available through an undescoverable URL (does not appear anywhere publicly similarly to preview posts) on the site.
- 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
