Improve test coverage

src/room/RingingAudioRenderer.test.tsx

@@ -0,0 +1,59 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { expect, type MockedFunction, test, vi } from "vitest";
+import { act, render } from "@testing-library/react";
+import { BehaviorSubject } from "rxjs";
+
+import { useAudioContext } from "../useAudioContext";
+import { createRingingMedia } from "../state/media/RingingMediaViewModel";
+import { alice, aliceId } from "../utils/test-fixtures";
+import { constant } from "../state/Behavior";
+import { RingingAudioRenderer } from "./RingingAudioRenderer";
+import { prefetchSounds } from "../soundUtils";
+
+vi.mock("../useAudioContext");
+vi.mock("../soundUtils");
+
+test("ringtone plays on loop while ringing", () => {
+  (prefetchSounds as MockedFunction<typeof prefetchSounds>).mockResolvedValue({
+    sound: new ArrayBuffer(0),
+  });
+  const endSoundLooping = vi.fn().mockReturnValue(Promise.resolve());
+  const playSoundLooping = vi.fn().mockReturnValue(endSoundLooping);
+  (useAudioContext as MockedFunction<typeof useAudioContext>).mockReturnValue({
+    playSound: vi.fn(),
+    playSoundLooping,
+    soundDuration: {},
+  });
+
+  const pickupState$ = new BehaviorSubject<"ringing" | "timeout" | "decline">(
+    "ringing",
+  );
+  const vm = createRingingMedia({
+    id: aliceId,
+    userId: alice.userId,
+    displayName$: constant("Alice"),
+    mxcAvatarUrl$: constant(undefined),
+    intent: "audio",
+    pickupState$,
+  });
+
+  // Begin ringing
+  render(<RingingAudioRenderer vm={vm} muted={false} />);
+  expect(playSoundLooping).toHaveBeenCalledExactlyOnceWith(
+    "ringtone",
+    expect.any(Number),
+  );
+  expect(endSoundLooping).not.toHaveBeenCalled();
+  vi.clearAllMocks();
+
+  // End ringing
+  act(() => pickupState$.next("decline"));
+  expect(playSoundLooping).not.toHaveBeenCalled();
+  expect(endSoundLooping).toHaveBeenCalledExactlyOnceWith();
+});