What types of test do scientists perform on robots

This is very vague but read below my response:

Explanation

according to https://link.springer.com/chapter/10.1007/978-1-4612-3148-6_12 it states," The forms of performance testing vary from the verification of the design goals by the robot manufacturer to the determination of the most appropriate robot for a specific use. The purpose of the robot reliability testing program is to obtain knowledge of failures—in particular, robot failure occurrence patterns. Robot reliability tests may be categorized into three broad groups [2]: reliability development and demonstration testing, qualification and acceptance testing, and operational testing." so pretty much on what its task to do and to learn from its mistake to reach towards it goal. The testings could be reliability development and demonstration testing, qualification and acceptance testing, and operational testing.

there is none because earth is stationary and flat.