Fix useRoomMembers missing updates causing incorrect membership counts (#11392)

* Fix useRoomMembers missing updates

* Also fix useRoomMemberCount

* Add tests

src/hooks/useRoomMembers.ts

@@ -25,7 +25,7 @@ export const useRoomMembers = (room: Room, throttleWait = 250): RoomMember[] =>
     const [members, setMembers] = useState<RoomMember[]>(room.getJoinedMembers());
     useTypedEventEmitter(
         room.currentState,
-        RoomStateEvent.Update,
+        RoomStateEvent.Members,
         throttle(
             () => {
                 setMembers(room.getJoinedMembers());
@@ -42,7 +42,7 @@ export const useRoomMemberCount = (room: Room, throttleWait = 250): number => {
     const [count, setCount] = useState<number>(room.getJoinedMemberCount());
     useTypedEventEmitter(
         room.currentState,
-        RoomStateEvent.Update,
+        RoomStateEvent.Members,
         throttle(
             () => {
                 setCount(room.getJoinedMemberCount());

test/hooks/useRoomMembers-test.tsx

@@ -0,0 +1,122 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { waitFor } from "@testing-library/react";
+import { renderHook, act } from "@testing-library/react-hooks/dom";
+import { MatrixClient, MatrixEvent, Room } from "matrix-js-sdk/src/matrix";
+
+import { MatrixClientPeg } from "../../src/MatrixClientPeg";
+import { stubClient } from "../test-utils";
+import { useMyRoomMembership, useRoomMemberCount, useRoomMembers } from "../../src/hooks/useRoomMembers";
+
+describe("useRoomMembers", () => {
+    function render(room: Room) {
+        return renderHook(() => useRoomMembers(room));
+    }
+
+    let cli: MatrixClient;
+    let room: Room;
+
+    beforeEach(() => {
+        stubClient();
+        cli = MatrixClientPeg.safeGet();
+        room = new Room("!room:server", cli, cli.getSafeUserId());
+    });
+
+    it("should update on RoomState.Members events", async () => {
+        const { result } = render(room);
+
+        expect(result.current).toHaveLength(0);
+
+        act(() => {
+            room.currentState.markOutOfBandMembersStarted();
+            room.currentState.setOutOfBandMembers([
+                new MatrixEvent({
+                    type: "m.room.member",
+                    state_key: "!user:server",
+                    room_id: room.roomId,
+                    content: {
+                        membership: "join",
+                    },
+                }),
+            ]);
+        });
+        await waitFor(() => expect(result.current).toHaveLength(1));
+    });
+});
+
+describe("useRoomMemberCount", () => {
+    function render(room: Room) {
+        return renderHook(() => useRoomMemberCount(room));
+    }
+
+    let cli: MatrixClient;
+    let room: Room;
+
+    beforeEach(() => {
+        stubClient();
+        cli = MatrixClientPeg.safeGet();
+        room = new Room("!room:server", cli, cli.getSafeUserId());
+    });
+
+    it("should update on RoomState.Members events", async () => {
+        const { result } = render(room);
+
+        expect(result.current).toBe(0);
+
+        act(() => {
+            room.currentState.markOutOfBandMembersStarted();
+            room.currentState.setOutOfBandMembers([
+                new MatrixEvent({
+                    type: "m.room.member",
+                    state_key: "!user:server",
+                    room_id: room.roomId,
+                    content: {
+                        membership: "join",
+                    },
+                }),
+            ]);
+        });
+        await waitFor(() => expect(result.current).toBe(1));
+    });
+});
+
+describe("useMyRoomMembership", () => {
+    function render(room: Room) {
+        return renderHook(() => useMyRoomMembership(room));
+    }
+
+    let cli: MatrixClient;
+    let room: Room;
+
+    beforeEach(() => {
+        stubClient();
+        cli = MatrixClientPeg.safeGet();
+        room = new Room("!room:server", cli, cli.getSafeUserId());
+    });
+
+    it("should update on RoomState.Members events", async () => {
+        room.updateMyMembership("join");
+        const { result } = render(room);
+
+        expect(result.current).toBe("join");
+
+        act(() => {
+            room.updateMyMembership("leave");
+        });
+        await waitFor(() => expect(result.current).toBe("leave"));
+    });
+});