chromium/third_party/blink/web_tests/media/encrypted-media/encrypted-media-setmediakeys.html

<!DOCTYPE html>
<html>
    <head>
        <title>setMediaKeys</title>
        <script src="encrypted-media-utils.js"></script>
        <script src="../../resources/testharness.js"></script>
        <script src="../../resources/testharnessreport.js"></script>
    </head>
    <body>
        <video></video>
        <script>
            async_test(function(test)
            {
                var mediaKeys;
                var video = document.querySelector('video');
                assert_not_equals(video, null);

                // Test MediaKeys assignment.
                assert_equals(video.mediaKeys, null);
                assert_equals(typeof video.setMediaKeys, 'function');

                // Try setting mediaKeys to null.
                video.setMediaKeys(null).then(function(result) {
                    assert_equals(video.mediaKeys, null);

                    // Try setting mediaKeys to the wrong type of object.
                    return video.setMediaKeys(new Date());
                }).then(function(result) {
                    assert_unreached('setMediaKeys did not fail when setting to Date()');
                }, function(error) {
                    // TypeError expected.
                    assert_equals(error.name, 'TypeError');

                    // Create a MediaKeys object and assign it to video.
                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', getSimpleConfiguration());
                }).then(function(access) {
                    assert_equals(access.keySystem, 'org.w3.clearkey');
                    return access.createMediaKeys();
                }).then(function(result) {
                    mediaKeys = result;
                    assert_not_equals(mediaKeys, null);
                    assert_equals(typeof mediaKeys.createSession, 'function');
                    return video.setMediaKeys(mediaKeys);
                }).then(function(result) {
                    assert_not_equals(video.mediaKeys, null);
                    assert_true(video.mediaKeys === mediaKeys);
                    test.done();
                }).catch(function(error) {
                    forceTestFailureFromPromise(test, error);
                });
            }, 'Setting MediaKeys on a video object.');
        </script>
    </body>
</html>