Verizon IndyCar Series Teams Set to Test at Sonoma Raceway, Aug. 13 Six of 10 Drivers Eligible for Series Title to Test  SONOMA, Calif. (Aug. 6, 2015) – Race fans are invited to enjoy a taste of Verizon IndyCar Series action at a free test session at Sonoma Raceway onThursday, Aug. 13. Seven Verizon IndyCar Series…