refs https://linear.app/tryghost/issue/CORE-1/multiple-adapters-per-type
- While digging around this area refactored the code to use more readable async/await syntax instead of chaining then's
- Dropped unneeded "catch" block in save method as all it was doing was rethrowing an error with out additional handling
- 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
