1 files changed, 68 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_delay_autoplay_playAfterTabVisible.js b/toolkit/content/tests/browser/browser_delay_autoplay_playAfterTabVisible.js
new file mode 100644
index 0000000000..198deeb85f
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_delay_autoplay_playAfterTabVisible.js
@@ -0,0 +1,68 @@
+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_audio() {
+  var audio = content.document.getElementById("testAudio");
+  if (!audio) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  audio.play();
+  return new Promise(resolve => {
+    audio.onplay = function () {
+      audio.onplay = null;
+      ok(true, "Audio starts playing.");
+      resolve();
+    };
+  });
+}
+
+add_task(async function setup_test_preference() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["media.useAudioChannelService.testing", true],
+      ["media.block-autoplay-until-in-foreground", true],
+    ],
+  });
+});
+
+/**
+ * This test is used for testing the visible tab which was not resumed yet.
+ * If the tab doesn't have any media component, it won't be resumed even it
+ * has already gone to foreground until we start audio.
+ */
+add_task(async function media_should_be_able_to_play_in_visible_tab() {
+  info("- open new background tab, and check tab's media pause state -");
+  let tab = BrowserTestUtils.addTab(window.gBrowser, PAGE);
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  await SpecialPowers.spawn(tab.linkedBrowser, [true], check_audio_pause_state);
+
+  info(
+    "- select tab as foreground tab, and tab's media should still be paused -"
+  );
+  await BrowserTestUtils.switchTab(window.gBrowser, tab);
+  await SpecialPowers.spawn(tab.linkedBrowser, [true], check_audio_pause_state);
+
+  info("- start audio in tab -");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], play_audio);
+
+  info("- audio should be playing -");
+  await waitForTabBlockEvent(tab, false);
+  await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [false],
+    check_audio_pause_state
+  );
+
+  info("- remove tab -");
+  BrowserTestUtils.removeTab(tab);
+});