enumerateDevices-with-selectAudioOutput.https.html

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This WPT test may be referenced by the following Test IDs:
- /audio-output/enumerateDevices-with-selectAudioOutput.https.html - WPT Dashboard Interop Dashboard

<!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>