* Creates a listener if not present and registers it.
*
*/
public void listen() {
if( _currentCoverageMonitor == null ) {
_currentCoverageMonitor = new CoverageStatusListener() {
public void coverageStatusChanged( int newCoverage ) {
//Notify manager of coverage changed event
//TODO: Add new coverage to the event argument if JS cares about it
_manager.onSystemEvent(_manager.EVENT_COV_CHANGE, "");
}