For those unaware, the Toyota Corolla is in for a redesign in its 2013 model year, and the Japanese automaker is currently testing it overseas. How does Motorcars Toyota know this? If we were to say that we're employing a group of secretive spies to photograph the next-gen compact, we'd be lying. Rather, the test vehicle was simply spotted by a lucky bystander who happened to snap a couple quick shots of it…