* Add missing spaces
* Use filter_map over map + reject/compact
* Simplify FactoryBot calls
* Use to_h with block instead of map + to_h
* Use guard clause
The tests around `Podcasts::Feed` helped catch a bug around the
migration of the podcast episode creation delayed job where the sidekiq
version was passing a string version of item hash to
`Podcasts::CreateEpisode` which was in fact expecting the hash to
contain symbols.
