General Motors and Lyft will begin testing a fleet of self-driving electric Chevrolet Bolt taxis within a year, according to a Lyft executive. The move, reported by the Wall Street Journal, follows a $500 million investment in Lyft by GM and will rely on technology from Cruise Automation, which GM plans to purchase. The self-driving taxi test is a direct challenge to ride-sharing app Uber, which has its own self-driving car testing center and plans to add autonomous cars to its service by 2020, according to the paper.