Tests

[agallant]

Ideally we should be able to just run existing social provider unit/integration tests, but some level of rigging up will presumably be required.

[dborkan]

We will also want tests to verify that Firebase permissions continue working as intended. These test cases have all been manually verified, but it would be good to have tests:

• I can't write to users inboxes who aren't my friends
• I can't write to a users inbox meant for another friend
• I can't see clients of users who aren't my friends
• I can only write to my own clientStates
• I can't read another users list of friends (even if they are my friend)
• I can't read messages sent from one user to another, even for friends
• I can't see who my friends are friends with