Most software systems are not tested on "all possible scenarios". Instead you run some basic must-pass scenarios, like the one in the video, where there is a r

Most software systems are not tested on "all possible scenarios". Instead you run some basic must-pass scenarios, like the one in the video, where there is a red light in front of the car, and a left turn green, in clear conditions and daylight. If the model doesn't pass, then don't ship it!