Bug 1262053 - part9 : add test case. r=baku,cpearce

MozReview-Commit-ID: DjoIr7jdZeq

--HG--
extra : rebase_source : c4a672cdf2816eaa0462928f42780c260660fb0b

toolkit/content/tests/browser/browser.ini

@@ -9,6 +9,10 @@ tags = audiochannel
 support-files =
   file_multipleAudio.html
 [browser_autoscroll_disabled.js]
+[browser_block_autoplay_media.js]
+tags = audiochannel
+support-files =
+  file_multipleAudio.html
 [browser_bug295977_autoscroll_overflow.js]
 [browser_bug451286.js]
 skip-if = !e10s

toolkit/content/tests/browser/browser_block_autoplay_media.js

@@ -0,0 +1,87 @@
+const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";
+
+var SuspendedType = {
+  NONE_SUSPENDED             : 0,
+  SUSPENDED_PAUSE            : 1,
+  SUSPENDED_BLOCK            : 2,
+  SUSPENDED_PAUSE_DISPOSABLE : 3
+};
+
+function* wait_for_tab_playing_event(tab, expectPlaying) {
+  if (tab.soundPlaying == expectPlaying) {
+    ok(true, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
+  } else {
+    yield BrowserTestUtils.waitForEvent(tab, "TabAttrModified", false, (event) => {
+      if (event.detail.changed.indexOf("soundplaying") >= 0) {
+        is(tab.soundPlaying, expectPlaying, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
+        return true;
+      }
+      return false;
+    });
+  }
+}
+
+function check_audio_suspended(suspendedType) {
+  var autoPlay = content.document.getElementById('autoplay');
+  if (!autoPlay) {
+    ok(false, "Can't get the audio element!");
+  }
+
+  is(autoPlay.computedSuspended, suspendedType,
+     "The suspeded state of autoplay audio is correct.");
+}
+
+add_task(function* setup_test_preference() {
+  yield new Promise(resolve => {
+    SpecialPowers.pushPrefEnv({"set": [
+      ["media.useAudioChannelService.testing", true],
+      ["media.block-autoplay-until-in-foreground", true]
+    ]}, resolve);
+  });
+});
+
+add_task(function* block_autoplay_media() {
+  info("- open new background tab1 -");
+  let tab1 = window.gBrowser.addTab("about:blank");
+  tab1.linkedBrowser.loadURI(PAGE);
+  yield BrowserTestUtils.browserLoaded(tab1.linkedBrowser);
+
+  info("- should block autoplay media for non-visited tab1 -");
+  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
+                          check_audio_suspended);
+
+  info("- open new background tab2 -");
+  let tab2 = window.gBrowser.addTab("about:blank");
+  tab2.linkedBrowser.loadURI(PAGE);
+  yield BrowserTestUtils.browserLoaded(tab2.linkedBrowser);
+
+  info("- should block autoplay for non-visited tab2 -");
+  yield ContentTask.spawn(tab2.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
+                          check_audio_suspended);
+
+  info("- select tab1 as foreground tab -");
+  yield BrowserTestUtils.switchTab(window.gBrowser, tab1);
+
+  info("- media should be unblocked because the tab was visited -");
+  yield wait_for_tab_playing_event(tab1, true);
+  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.NONE_SUSPENDED,
+                          check_audio_suspended);
+
+  info("- open another new foreground tab3 -");
+  let tab3 = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
+                                                         "about:blank");
+  info("- should still play media from tab1 -");
+  yield wait_for_tab_playing_event(tab1, true);
+  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.NONE_SUSPENDED,
+                          check_audio_suspended);
+
+  info("- should still block media from tab2 -");
+  yield wait_for_tab_playing_event(tab2, false);
+  yield ContentTask.spawn(tab2.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
+                          check_audio_suspended);
+
+  info("- remove tabs -");
+  yield BrowserTestUtils.removeTab(tab1);
+  yield BrowserTestUtils.removeTab(tab2);
+  yield BrowserTestUtils.removeTab(tab3);
+});