- starting and stopping Ghost is part of our rather unloved acceptance test framework
- moving them into their own file to make the different pieces clearer and also to start to make improvements
- first improvement had to happen as an aside - exposing the existingData property via a function and making the API clearer
- this was a weird thing set on module.exports, very hidden and hard to follow
- Note: stopGhost is only used once in the regression/modles/model_posts_spec.js file to make the test run fast enough...
- These tests are effectively "DB integration" tests e.g. non-unit tests because they do use the DB, they need their own framework
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