Starbucks CEO Brian Niccol is ready for some fizz.The company is testing a carbonated version of its Refreshers, which are iced juice and tea drinks often mixed with fruit pieces, that have become one of Starbucks' biggest beverage businesses since launching in 2012."I'm really excited that we're getting ready to go test sparkling. We're calling it Spritzers," he told investors on the company's third quarter earnings call Wednesday. The company delivered net sales of $9.3 billion for the period, with global ...