As with car testing, it is usually preferable, on engineering grounds, to perform the tests in a more controlled environment where the parameters can be tightly controlled and the outcomes exhaustively measured.
Here's a description of one such series of tests, and some video:
Here's a description of one such series of tests, and some video:
https://aviation-safety.net/wikibase/13578
https://www.youtube.com/watch?v=ORrPSXuBQm8