Add local echo of connected devices in video rooms (#8368)

test/test-utils/test-utils.ts

@@ -379,6 +379,7 @@ export function mkStubRoom(roomId: string = null, name: string, client: MatrixCl
         getJoinRule: jest.fn().mockReturnValue("invite"),
         loadMembersIfNeeded: jest.fn(),
         client,
+        myUserId: client?.getUserId(),
         canInvite: jest.fn(),
     } as unknown as Room;
 }

test/test-utils/video.ts

@@ -21,7 +21,7 @@ import { mkEvent } from "./test-utils";
 import { VIDEO_CHANNEL_MEMBER } from "../../src/utils/VideoChannelUtils";
 import VideoChannelStore, { VideoChannelEvent, IJitsiParticipant } from "../../src/stores/VideoChannelStore";
 
-class StubVideoChannelStore extends EventEmitter {
+export class StubVideoChannelStore extends EventEmitter {
     private _roomId: string;
     public get roomId(): string { return this._roomId; }
     private _connected: boolean;