From df4f7febc25085c30f94693257c7682310a2cd2e Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Fri, 23 Jan 2026 11:31:37 +0000
Subject: [PATCH] test(ai): add unit tests for playbackService (agent)

---
 tests/services/playbackService.test.mjs | 213 ++++++++++++++++++++++++
 1 file changed, 213 insertions(+)
 create mode 100644 tests/services/playbackService.test.mjs

diff --git a/tests/services/playbackService.test.mjs b/tests/services/playbackService.test.mjs
new file mode 100644
index 00000000..b8a3d703
--- /dev/null
+++ b/tests/services/playbackService.test.mjs
@@ -0,0 +1,213 @@
+import { describe, test, mock, before, after, beforeEach, afterEach } from "node:test";
+import assert from "node:assert/strict";
+import { createUiDom } from "../ui/helpers/jsdom-test-helpers.mjs";
+import { PlaybackService } from "../../js/services/playbackService.js";
+
+describe("PlaybackService", () => {
+  let dom;
+  let document;
+  let window;
+
+  before(() => {
+    dom = createUiDom();
+    window = dom.window;
+    document = dom.document;
+
+    // Mock HTMLMediaElement constants if missing in JSDOM
+    if (!window.HTMLMediaElement) {
+      window.HTMLMediaElement = {
+        HAVE_NOTHING: 0,
+        HAVE_METADATA: 1,
+        HAVE_CURRENT_DATA: 2,
+        HAVE_FUTURE_DATA: 3,
+        HAVE_ENOUGH_DATA: 4,
+      };
+    }
+  });
+
+  after(() => {
+    dom.cleanup();
+  });
+
+  test("Initialization sets defaults and dependencies", () => {
+    const logger = mock.fn();
+    const service = new PlaybackService({ logger });
+
+    assert.ok(service);
+    assert.equal(typeof service.log, "function");
+    service.log("test");
+    assert.equal(logger.mock.callCount(), 1);
+    assert.equal(service.urlFirstEnabled, true);
+  });
+
+  test("prepareVideoElement respects localStorage and binds listener", () => {
+    const service = new PlaybackService();
+    const video = document.createElement("video");
+
+    // Default: muted (unless localStorage says unmuted)
+    localStorage.removeItem("unmutedAutoplay");
+    service.prepareVideoElement(video);
+    assert.equal(video.muted, true);
+    assert.equal(video.dataset.autoplayBound, "true");
+
+    // Simulate volume change
+    video.muted = false;
+    video.dispatchEvent(new window.Event("volumechange"));
+    assert.equal(localStorage.getItem("unmutedAutoplay"), "true");
+
+    // Test respecting stored value
+    const video2 = document.createElement("video");
+    service.prepareVideoElement(video2);
+    assert.equal(video2.muted, false);
+  });
+
+  test("registerUrlPlaybackWatchdogs triggers onFallback on error", () => {
+    const service = new PlaybackService();
+    const video = document.createElement("video");
+    const onFallback = mock.fn();
+    const onSuccess = mock.fn();
+
+    service.registerUrlPlaybackWatchdogs(video, { onFallback, onSuccess });
+
+    video.dispatchEvent(new window.Event("error"));
+    assert.equal(onFallback.mock.callCount(), 1);
+    assert.equal(onFallback.mock.calls[0].arguments[0], "error");
+  });
+
+  test("registerUrlPlaybackWatchdogs triggers onSuccess on playing", () => {
+    const service = new PlaybackService();
+    const video = document.createElement("video");
+    const onFallback = mock.fn();
+    const onSuccess = mock.fn();
+
+    service.registerUrlPlaybackWatchdogs(video, { onFallback, onSuccess });
+
+    video.dispatchEvent(new window.Event("playing"));
+    assert.equal(onSuccess.mock.callCount(), 1);
+  });
+
+  test("createSession returns a PlaybackSession", () => {
+    const service = new PlaybackService();
+    const session = service.createSession({ url: "https://example.com/video.mp4" });
+
+    assert.ok(session);
+    assert.equal(service.currentSession, session);
+    assert.equal(session.sanitizedUrl, "https://example.com/video.mp4");
+  });
+
+  describe("PlaybackSession Flow", () => {
+    let service;
+    let video;
+    let playMock;
+    let loadMock;
+    let pauseMock;
+
+    beforeEach(() => {
+      mock.timers.enable({ apis: ['setTimeout'] });
+      service = new PlaybackService({
+        logger: () => {},
+        isValidMagnetUri: () => true, // Allow all magnets
+      });
+      video = document.createElement("video");
+
+      // Mock methods not implemented in JSDOM
+      playMock = mock.fn(async () => {});
+      loadMock = mock.fn();
+      pauseMock = mock.fn();
+
+      video.play = playMock;
+      video.load = loadMock;
+      video.pause = pauseMock;
+
+      Object.defineProperty(video, 'readyState', {
+        writable: true,
+        value: window.HTMLMediaElement.HAVE_NOTHING
+      });
+      Object.defineProperty(video, 'networkState', {
+        writable: true,
+        value: 0
+      });
+    });
+
+    test("URL Probe Success starts playback", async () => {
+      const probeUrl = mock.fn(async () => ({ outcome: "good", status: 200 }));
+      const playViaWebTorrent = mock.fn();
+
+      const testSession = service.createSession({
+        url: "https://example.com/video.mp4",
+        videoElement: video,
+        probeUrl,
+        playViaWebTorrent,
+      });
+
+      const startPromise = testSession.start();
+
+      // Allow execute() to proceed past await probeUrl() and install watchdogs
+      await new Promise(resolve => process.nextTick(resolve));
+      await new Promise(resolve => process.nextTick(resolve));
+
+      // Trigger success event
+      video.dispatchEvent(new window.Event("playing"));
+
+      const result = await startPromise;
+
+      assert.equal(probeUrl.mock.callCount(), 1);
+      assert.equal(playMock.mock.callCount(), 1);
+      assert.equal(result.source, "url");
+      assert.equal(playViaWebTorrent.mock.callCount(), 0);
+    });
+
+    test("URL Probe Failure triggers fallback", async () => {
+      const probeUrl = mock.fn(async () => ({ outcome: "bad", status: 404 }));
+      const playViaWebTorrent = mock.fn(async () => ({ infoHash: "123" }));
+
+      const session = service.createSession({
+        url: "https://example.com/video.mp4",
+        magnet: "magnet:?xt=urn:btih:123",
+        videoElement: video,
+        probeUrl,
+        playViaWebTorrent,
+      });
+
+      const result = await session.start();
+
+      assert.equal(probeUrl.mock.callCount(), 1);
+      assert.equal(playViaWebTorrent.mock.callCount(), 1);
+      assert.equal(result.source, "torrent");
+    });
+
+    test("Watchdog Stall triggers fallback", async () => {
+        const probeUrl = mock.fn(async () => ({ outcome: "good", status: 200 }));
+        const playViaWebTorrent = mock.fn(async () => ({ infoHash: "123" }));
+
+        const session = service.createSession({
+          url: "https://example.com/video.mp4",
+          magnet: "magnet:?xt=urn:btih:123",
+          videoElement: video,
+          probeUrl,
+          playViaWebTorrent,
+        });
+
+        const startPromise = session.start();
+
+        // Allow execute() to proceed past await probeUrl() and install watchdogs
+        await new Promise(resolve => process.nextTick(resolve));
+        await new Promise(resolve => process.nextTick(resolve));
+        await new Promise(resolve => process.nextTick(resolve));
+
+        // Advance time to trigger stall (default 8000ms)
+        mock.timers.tick(10000);
+
+        const result = await startPromise;
+
+        assert.equal(probeUrl.mock.callCount(), 1);
+        assert.equal(playMock.mock.callCount(), 1); // It tried to play
+        assert.equal(playViaWebTorrent.mock.callCount(), 1); // Fallback happened
+        assert.equal(result.source, "torrent");
+      });
+
+    afterEach(() => {
+        mock.timers.reset();
+    });
+  });
+});