ventListener("error", test.unreached_func("Unexpected event 'error'"));
              MediaSourceUtil.fetchManifestAndData(test, manifestFilenameAV, function (typeAV, dataAV)
              {
                  var sourceBuffer = mediaSource.addSourceBuffer(typeAV);

                  test.expectEvent(sourceBuffer.audioTracks, "addtrack");
                  test.expectEvent(sourceBuffer.videoTracks, "addtrack");
                  sourceBuffer.appendBuffer(dataAV);

                  test.waitForExpectedEvents