* Allow Cast to play Plex media
* Add Plex to after_dependencies, add missing constant
* Extract function from Sonos service to allow media lookups
* Move to non-async method
* Check if media_id exists
* Add test to make codecov happy
* Use CONF_CLIENT_ID & CONF_CLIENT_SECRET from homeassistant.const
* Fix pylint
* Use in tests
* Search for "client_id"
* Fix tests
* Fix test
* Fix test