public GridTestPrintStream(PrintStream out,ThreadGroup baseGrp){
  super(out);
  assert baseGrp != null;
  this.baseGrp=baseGrp;
}

public GridTestPrintStream ( PrintStream out , ThreadGroup baseGrp ) { super ( out ) ; assert baseGrp != null ; this . baseGrp = baseGrp ; }
creates test print stream around the base stream passed in also specifying root thread group .
