1 files changed, 66 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_delay_autoplay_notInTreeAudio.js b/toolkit/content/tests/browser/browser_delay_autoplay_notInTreeAudio.js
new file mode 100644
index 0000000000..3e2df53648
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_delay_autoplay_notInTreeAudio.js
@@ -0,0 +1,66 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+const PAGE =
+  "https://example.com/browser/toolkit/content/tests/browser/file_nonAutoplayAudio.html";
+
+function check_audio_pause_state(expectPause) {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  is(audio.paused, expectPause, "The pause state of audio is corret.");
+}
+
+function play_not_in_tree_audio() {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  content.document.body.removeChild(audio);
+
+  // Add timeout to ensure the audio is removed from DOM tree.
+  content.setTimeout(function () {
+    info("Prepare to start playing audio.");
+    audio.play();
+  }, 1000);
+}
+
+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 block_not_in_tree_media() {
+  info("- open new background tab -");
+  let tab = BrowserTestUtils.addTab(window.gBrowser, PAGE);
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  info("- tab should not be blocked -");
+  await waitForTabBlockEvent(tab, false);
+
+  info("- check audio's playing state -");
+  await SpecialPowers.spawn(tab.linkedBrowser, [true], check_audio_pause_state);
+
+  info("- playing audio -");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], play_not_in_tree_audio);
+
+  info("- tab should be blocked -");
+  await waitForTabBlockEvent(tab, true);
+
+  info("- switch tab -");
+  await BrowserTestUtils.switchTab(window.gBrowser, tab);
+
+  info("- tab should be resumed -");
+  await waitForTabBlockEvent(tab, false);
+
+  info("- tab should be audible -");
+  await waitForTabPlayingEvent(tab, true);
+
+  info("- remove tab -");
+  BrowserTestUtils.removeTab(tab);
+});