During the audit in
MDL-63311, there have been identified some new functions to add, for supporting conversations between 3 or more users:
- add_members_to_conversation(userids, convid)
- remove_members_from_conversation(userids. convid)
We need to create these methods in the messaging API and add some phpunit tests for checking them.
We also should add some extra testing scenarios for the existing methods create_conversation_between_users and get_conversation_between_users for covering conversations with 3 or more members.