Amazon.com Inc.’s (NASDAQ:AMZN) self-driving car unit Zoox on Wednesday said it will soon begin testing in Austin, Texas, and Miami. What Happened: The two cities will mark the fourth and fifth public testing locations for Zoox. The company started in San Francisco in 2018 and has since expanded to Las Vegas and Seattle. The company will initially deploy its Toyota Highlander test fleet retrofitted with its Automated Driving System (ADS) in small areas near business and entertainment districts of the two cities. These vehicles will also have safety drivers. Zoox won’t be deploying its purpose-…