Implement small broadcast PiP (#9755)

test/voice-broadcast/components/atoms/VoiceBroadcastPlaybackControl-test.tsx

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+/*
+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 React from "react";
+import { render, RenderResult, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+import { VoiceBroadcastPlaybackControl, VoiceBroadcastPlaybackState } from "../../../../src/voice-broadcast";
+
+describe("<VoiceBroadcastPlaybackControl />", () => {
+    const renderControl = (state: VoiceBroadcastPlaybackState): { result: RenderResult; onClick: () => void } => {
+        const onClick = jest.fn();
+        return {
+            onClick,
+            result: render(<VoiceBroadcastPlaybackControl state={state} onClick={onClick} />),
+        };
+    };
+
+    it.each([
+        VoiceBroadcastPlaybackState.Stopped,
+        VoiceBroadcastPlaybackState.Paused,
+        VoiceBroadcastPlaybackState.Buffering,
+        VoiceBroadcastPlaybackState.Playing,
+    ])("should render state %s as expected", (state: VoiceBroadcastPlaybackState) => {
+        expect(renderControl(state).result.container).toMatchSnapshot();
+    });
+
+    describe("when clicking the control", () => {
+        let onClick: () => void;
+
+        beforeEach(async () => {
+            onClick = renderControl(VoiceBroadcastPlaybackState.Playing).onClick;
+            await userEvent.click(screen.getByLabelText("pause voice broadcast"));
+        });
+
+        it("should invoke the onClick callback", () => {
+            expect(onClick).toHaveBeenCalled();
+        });
+    });
+});