Add thread notification with server assistance (MSC3773) (#9400)

Co-authored-by: Janne Mareike Koschinski <janne@kuschku.de>

test/components/views/rooms/NotificationBadge/NotificationBadge-test.tsx

@@ -0,0 +1,49 @@
+/*
+Copyright 2022 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 { fireEvent, render } from "@testing-library/react";
+import React from "react";
+
+import {
+    StatelessNotificationBadge,
+} from "../../../../../src/components/views/rooms/NotificationBadge/StatelessNotificationBadge";
+import { NotificationColor } from "../../../../../src/stores/notifications/NotificationColor";
+
+describe("NotificationBadge", () => {
+    describe("StatelessNotificationBadge", () => {
+        it("lets you click it", () => {
+            const cb = jest.fn();
+
+            const { container } = render(<StatelessNotificationBadge
+                symbol=""
+                color={NotificationColor.Red}
+                count={5}
+                onClick={cb}
+                onMouseOver={cb}
+                onMouseLeave={cb}
+            />);
+
+            fireEvent.click(container.firstChild);
+            expect(cb).toHaveBeenCalledTimes(1);
+
+            fireEvent.mouseEnter(container.firstChild);
+            expect(cb).toHaveBeenCalledTimes(2);
+
+            fireEvent.mouseLeave(container.firstChild);
+            expect(cb).toHaveBeenCalledTimes(3);
+        });
+    });
+});