As NC State prepares to battle Tennessee in the Duke’s Mayo Classic this weekend, Volunteers coach Josh Heupel talked about what challenge the Wolfpack presents for his team. “Really good opponent that we’re playing,” Heupel told reporters in Knoxville on Monday. “They play all three phases of the game really well together. Defensively, they’ve been really good and it will be a great test for us up front. Offensively, they’ve got a really experienced quarterback with playmakers around him. Their special teams are really good, too. Huge test for us this week, one that we’re really excited about…