Answer:
Beta Testing
Explanation:
Beta Testing is the product development stage when a product is tested in a real enviroment with the goal of finding any issues (in software development these are referred to as bugs) the product may have, in order to sort them out in the final stage.
A racing car running under extreme conditions is a good way to do beta testing because in such circumstances issues or bugs are likely to arise, since the situation by definition is extreme. The auto company can later on check for the issues, and solve them before releasing the products.