function runTest(config,qualifier) {

    var testname = testnamePrefix( qualifier, config.keysystem )
                        + ', persistent-license, '
                        + /video\/([^;]*)/.exec( config.videoType )[ 1 ]
                        + ', playback, destroy and acknowledge';

    var configuration = {   initDataTypes: [ config.initDataType ],
                            audioCapabilities: [ { contentType: config.audioType } ],
                            videoCapabilities: [ { contentType: config.videoType } ],
                            sessionTypes: [ 'persistent-license' ] };

    async_test( function(test) {

        var _video = config.video,
            _mediaKeys,
            _mediaKeySession,
            _mediaSource,
            _sessionId,
            _startedReleaseSequence = false;

        function onFailure(error) {
            forceTestFailureFromPromise(test, error);
        }

        function onMessage(event) {
            assert_equals(event.target, _mediaKeySession);
            assert_true(event instanceof window.MediaKeyMessageEvent);
            assert_equals(event.type, 'message');

            config.messagehandler(event.messageType, event.message).then(function(response) {
                return _mediaKeySession.update(response);
            }).catch(onFailure);
        }

        function onEncrypted(event) {
            assert_equals(event.target, _video);
            assert_true(event instanceof window.MediaEncryptedEvent);
            assert_equals(event.type, 'encrypted');

            waitForEventAndRunStep('message', _mediaKeySession, onMessage, test);
            _mediaKeySession.generateRequest(   config.initData ? config.initDataType : event.initDataType,
                                                config.initData || event.initData ).then( test.step_func(function() {
                assert_not_equals( _mediaKeySession.sessionId, undefined, "SessionId should be defined" );
                _sessionId = _mediaKeySession.sessionId;
            })).catch(onFailure);
        }

        function onTimeupdate(event) {
            if (_video.currentTime > ( config.duration || 1 ) && !_startedReleaseSequence) {
                _video.removeEventListener('timeupdate', onTimeupdate);
                _video.pause();
                _video.removeAttribute('src');
                _video.load();

                _startedReleaseSequence = true;
                _mediaKeySession.closed.then(onClosed);
                _mediaKeySession.remove().catch(onFailure);
            }
        }

        function onPlaying(event) {
            // Not using waitForEventAndRunStep() to avoid too many
            // EVENT(onTimeUpdate) logs.
            _video.addEventListener('timeupdate', onTimeupdate, true);
        }

        function onClosed() {
            // Try and reload and check this fails
            var mediaKeySession = _mediaKeys.createSession( 'persistent-license' );
            mediaKeySession.load(_sessionId).then( test.step_func(function(success) {
                assert_false( success, "Load of removed session shouold fail" );
                test.done();
            })).catch(onFailure);
        }

        navigator.requestMediaKeySystemAccess(config.keysystem, [configuration]).then(function(access) {
            return access.createMediaKeys();
        }).then(function(mediaKeys) {
            _mediaKeys = mediaKeys;
            return _video.setMediaKeys(_mediaKeys);
        }).then(function() {
            _mediaKeySession = _mediaKeys.createSession('persistent-license');
            waitForEventAndRunStep('encrypted', _video, onEncrypted, test);
            waitForEventAndRunStep('playing', _video, onPlaying, test);
            return testmediasource(config);
        }).then(function(source) {
            _mediaSource = source;
            _video.src = URL.createObjectURL(_mediaSource);
            return source.done;
        }).then(function(){
            _video.play();
        }).catch(onFailure);
    }, testname);
}