<!doctype html> <head> <title>Test effect of selectAudioOutput() on audiooutput devices from enumerateDevices()</title> <link rel="help" href="https://w3c.github.io/mediacapture-output/#dom-mediadevices-selectaudiooutput"> </head> <body> <p class="instructions">If prompted, <strong>please allow</strong> access to an audio output device.</p> </body> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/resources/testdriver.js"></script> <script src="/resources/testdriver-vendor.js"></script> <script> 'use strict'; promise_test(async () => { const devices = await navigator.mediaDevices.enumerateDevices(); const outputDevices = devices.filter(info => info.kind == "audiooutput"); assert_equals(outputDevices.length, 0, "number of audiooutput devices."); }, "enumerateDevices() returns no audiooutput devices before permission grant"); let selected; promise_test(async t => { await test_driver.bless('transient activation for selectAudioOutput()'); selected = await navigator.mediaDevices.selectAudioOutput(); assert_true(selected instanceof MediaDeviceInfo, "resolves with a MediaDeviceInfo."); assert_equals(selected.kind, "audiooutput", "selected.kind"); assert_greater_than(selected.deviceId.length, 0, "selected.deviceId.length"); assert_greater_than(selected.groupId.length, 0, "selected.groupId.length"); assert_not_equals(selected.label, undefined, "selected.label"); }, "selectAudioOutput()"); promise_test(async () => { // "Once a device is exposed after a call to selectAudioOutput, it MUST be // listed by enumerateDevices() for the current browsing context." const devices = await navigator.mediaDevices.enumerateDevices(); const outputDevices = devices.filter(info => info.kind == "audiooutput"); assert_equals(outputDevices.length, 1, "number of audiooutput devices."); assert_not_equals(selected, undefined); const [info] = outputDevices; assert_equals(info.deviceId, selected.deviceId, "deviceId exposed"); assert_equals(info.groupId, selected.groupId, "groupId exposed"); assert_equals(info.label, selected.label, "label exposed"); }, "enumerateDevices() after selectAudioOutput()"); </script>