1 files changed, 97 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_delay_autoplay_playMediaInMuteTab.js b/toolkit/content/tests/browser/browser_delay_autoplay_playMediaInMuteTab.js
new file mode 100644
index 0000000000..c333021697
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_delay_autoplay_playMediaInMuteTab.js
@@ -0,0 +1,97 @@
+const PAGE =
+  "https://example.com/browser/toolkit/content/tests/browser/file_nonAutoplayAudio.html";
+
+function wait_for_event(browser, event) {
+  return BrowserTestUtils.waitForEvent(browser, event, false, event => {
+    is(
+      event.originalTarget,
+      browser,
+      "Event must be dispatched to correct browser."
+    );
+    return true;
+  });
+}
+
+function check_audio_volume_and_mute(expectedMute) {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  let expectedVolume = expectedMute ? 0.0 : 1.0;
+  is(expectedVolume, audio.computedVolume, "Audio's volume is correct!");
+  is(expectedMute, audio.computedMuted, "Audio's mute state is correct!");
+}
+
+function check_audio_pause_state(expectedPauseState) {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  is(audio.paused, expectedPauseState, "Audio is paused.");
+}
+
+function play_audio() {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  audio.play();
+  ok(audio.paused, "Can't play audio, because the tab was still blocked.");
+}
+
+add_task(async function setup_test_preference() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["media.useAudioChannelService.testing", true],
+      ["media.block-autoplay-until-in-foreground", true],
+    ],
+  });
+});
+
+add_task(async function unblock_icon_should_disapear_after_resume_tab() {
+  info("- open new background tab -");
+  let tab = BrowserTestUtils.addTab(window.gBrowser, PAGE);
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  info("- audio doesn't be started in beginning -");
+  await SpecialPowers.spawn(tab.linkedBrowser, [true], check_audio_pause_state);
+
+  info("- audio shouldn't be muted -");
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [false],
+    check_audio_volume_and_mute
+  );
+
+  info("- tab shouldn't display unblocking icon -");
+  await waitForTabBlockEvent(tab, false);
+
+  info("- mute tab -");
+  tab.linkedBrowser.mute();
+  ok(tab.linkedBrowser.audioMuted, "Audio should be muted now");
+
+  info("- try to start audio in background tab -");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], play_audio);
+
+  info("- tab should display unblocking icon -");
+  await waitForTabBlockEvent(tab, true);
+
+  info("- select tab as foreground tab -");
+  await BrowserTestUtils.switchTab(window.gBrowser, tab);
+
+  info("- audio shoule be muted, but not be blocked -");
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [true],
+    check_audio_volume_and_mute
+  );
+
+  info("- tab should not display unblocking icon -");
+  await waitForTabBlockEvent(tab, false);
+
+  info("- remove tab -");
+  BrowserTestUtils.removeTab(tab);
+});