firefox-main/dom/media/mediacontrol/tests/browser/browser_media_control_mute.js (file symbol)

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Test Info: Warnings

const PAGE =
const testVideoId = "video";
add_task(async function setupTestingPref() {
await SpecialPowers.pushPrefEnv({
set: [["media.mediacontrol.testingevents.enabled", true]],
});
});
// Resolve once the controller's audible state reaches `audible`, driven by its
// onaudiblechange event (resolving immediately if it is already in that state).
function waitForControllerAudible(controller, audible) {
return new Promise(resolve => {
if (controller.isAudible === audible) {
resolve();
return;
}
controller.addEventListener("audiblechange", function handler() {
if (controller.isAudible === audible) {
controller.removeEventListener("audiblechange", handler);
resolve();
}
});
});
}
/**
* Muting and unmuting through the MediaController must update its muted state
* (isMuted) and silence then restore the tab's audio.
*/
add_task(async function testControllerMuteUnmute() {
info(`open page`);
const tab = await createLoadedTabWrapper(PAGE);
const controller = tab.controller;
ok(!controller.isMuted, "controller starts unmuted");
info(`start media; the controller should become audible`);
await Promise.all([
waitForControllerAudible(controller, true),
playMedia(tab, testVideoId),
]);
ok(controller.isAudible, "media is audible before muting");
info(`mute via the controller; it should become inaudible`);
const inaudible = waitForControllerAudible(controller, false);
controller.mute();
ok(controller.isMuted, "controller reports being muted");
await inaudible;
ok(!controller.isAudible, "media is inaudible after muting");
info(`unmute via the controller; it should become audible again`);
const audibleAgain = waitForControllerAudible(controller, true);
controller.unmute();
ok(!controller.isMuted, "controller reports being unmuted");
await audibleAgain;
ok(controller.isAudible, "media is audible again after unmuting");
info(`remove tab`);
await tab.close();
});