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

<!DOCTYPE html>
<html>
    <head>
        <title>onencrypted</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>
            var expectedInitData = stringToUint8Array('0123456789012345');

            // Will get 2 identical events, one for audio, one for video.
            var expectedEvents = 2;

            async_test(function(test)
            {
                var video = document.querySelector('video');
                var content = '../content/test-encrypted.webm';

                var onEncrypted = function(event)
                {
                    assert_equals(event.target, video);
                    assert_true(event instanceof window.MediaEncryptedEvent);
                    assert_equals(event.type, 'encrypted');
                    assert_equals(event.initDataType, 'webm');
                    assert_array_equals(new Uint8Array(event.initData), expectedInitData);

                    if (--expectedEvents == 0)
                        test.done();
                };

                waitForEventAndRunStep('encrypted', video, onEncrypted, test);
                video.src = content;
            }, 'encrypted fired on encrypted media file.');
        </script>
    </body>
</html>