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Test Info:

<!doctype html>
<title>enumerateDevices is returning new MediaDeviceInfo objects every time</title>
<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 src=permission-helper.js></script>
function doTest(callGetUserMedia, testName)
promise_test(async () => {
if (callGetUserMedia) {
await setMediaPermission();
await navigator.mediaDevices.getUserMedia({audio : true, video: true});
const deviceList1 = await navigator.mediaDevices.enumerateDevices();
const deviceList2 = await navigator.mediaDevices.enumerateDevices();
assert_equals(deviceList1.length, deviceList2.length);
for (let i = 0; i < deviceList1.length; i++) {
const device1 = deviceList1[i];
const device2 = deviceList2[i];
assert_not_equals(device1, device2);
assert_equals(device1.deviceId, device2.deviceId, "deviceId");
assert_equals(device1.kind, device2.kind, "kind");
if (!callGetUserMedia) {
/* For camera and microphone devices,
if the browsing context did not capture (i.e. getUserMedia() was not called or never resolved successfully),
the MediaDeviceInfo object will contain a valid value for kind
but empty strings for deviceId, label, and groupId. */
assert_equals(device1.deviceId, "", "deviceId is empty before capture");
assert_equals(device1.groupId, "", "groupId is empty before capture");
assert_equals(device1.label, "", "label is empty before capture");
assert_in_array(device1.kind, ["audioinput", "audiooutput", "videoinput"],
"kind is set to a valid value before capture");
/* Additionally, at most one device of each kind
will be listed in enumerateDevices() result. */
// FIXME: ensure browsers are tested as if they had multiple devices of at least one kind -
// this probably needs support
if (!callGetUserMedia) {
const deviceKinds = => d.kind);
for (let kind of deviceKinds) {
assert_equals(deviceKinds.filter(x => x===kind).length, 1, "At most 1 " + kind + " prior to capture");
}, testName);
doTest(false, "enumerateDevices exposes mostly empty objects ahead of successful getUserMedia call");
doTest(true, "enumerateDevices exposes expected objects after successful getUserMedia call");