public async Task LastUserLeavingCausesRoomDisband()
{
SetUserContext(ContextUser);
await Hub.JoinRoom(ROOM_ID);
Database.Verify(db => db.AddRoomParticipantAsync(It.IsAny <MultiplayerRoom>(), It.IsAny <MultiplayerRoomUser>()), Times.Exactly(1));
SetUserContext(ContextUser2);
await Hub.JoinRoom(ROOM_ID);
Database.Verify(db => db.AddRoomParticipantAsync(It.IsAny <MultiplayerRoom>(), It.IsAny <MultiplayerRoomUser>()), Times.Exactly(2));
SetUserContext(ContextUser);
await Hub.LeaveRoom();
Database.Verify(db => db.RemoveRoomParticipantAsync(It.IsAny <MultiplayerRoom>(), It.IsAny <MultiplayerRoomUser>()), Times.Exactly(1));
// room still exists even though the original host left
Assert.True(Hub.CheckRoomExists(ROOM_ID));
SetUserContext(ContextUser2);
await Hub.LeaveRoom();
Database.Verify(db => db.RemoveRoomParticipantAsync(It.IsAny <MultiplayerRoom>(), It.IsAny <MultiplayerRoomUser>()), Times.Exactly(2));
// room is gone.
Assert.False(Hub.CheckRoomExists(ROOM_ID));
}