toolkit/content/tests/browser/browser_delay_autoplay_webAudio.js


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const PAGE =
  "https://example.com/browser/toolkit/content/tests/browser/file_webAudio.html";

// The tab closing code leaves an uncaught rejection. This test has been
// whitelisted until the issue is fixed.
if (!gMultiProcessBrowser) {
  const { PromiseTestUtils } = ChromeUtils.importESModule(
    "resource://testing-common/PromiseTestUtils.sys.mjs"
  );
  PromiseTestUtils.expectUncaughtRejection(/is no longer, usable/);
}

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_web_audio() {
  info("- open new background tab -");
  let tab = BrowserTestUtils.addTab(window.gBrowser, "about:blank");
  BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, PAGE);
  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);

  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);
});