Testo scored his 10th goal of the year at the 13:28 mark.
He stole the ball from an N.C. State defender and sent a shot from 12 yards out to the middle of the net.
North Carolina's Storey -- the ACC Rookie of the Year -- scored at the 73:00 mark for his ninth goal of the season.
Freshman Tim Merritt drove down the left side and passed the ball to senior midfielder Noz Yamauchi. Yamauchi crossed the ball to Storey, who flicked the ball in the goal from short range to cap the Tar Heels' scoring.
North Carolina is ranked sixth by Soccer America, the NSCAA and Soccertimes.com. The Tar Heels are seeded second in the conference tournament and N.C. State is seeded seventh.
North Carolina improved to 16-3 overall, while the Wolfpack fell to 4-15 overall this season.
North Carolina will play the winner of the Clemson-Maryland match Friday night at 8 p.m. on Historic Riggs Field.
This is the third consecutive year that the Tar Heels have advanced to the semifinals of the ACC Tournament.
