What needs to be tested - adding/removing articles from default and specific lists
iOS app

• All articles - default reading list
• Reading - specific reading lists

Android app

• Saved - default reading list
• Specific reading lists

Test scenarios:

(1) Adding article to a Reading Lists and checking Saved status

• add an article to default list on Android
• go to web
  • check if an added article displays Saved status
  • check if the article is added to a Reading Lists
• go to iOS app
  • check if an added article displays Saved status
  • check if the article is added to a Reading Lists

(2) Removing a saved article from Reading Lists - remove via the un-save button and via removing directly from the Reading Lists

• remove an article from Android default/specific Reading lists
• check if it's removed from other devices' Reading Lists

• remove an article from iOS default/specific Reading lists
• check if it's removed from other devices' Reading Lists

• remove an article from web Reading lists
• check if it's removed from other devices' Reading Lists

TODO
Reference: review https://phabricator.wikimedia.org/T417923#11730417 for more granular testing