How to automatically break your code to check tests?

Question

Python

I heard that there are tools that make random changes to the code and check that the tests fail. If you didn’t fall, then this place is not covered by tests. Please advise such a tool. If you really used it, I will be glad to some feedback.

Answer 1

mutmut ( https://github.com/boxed/mutmut)

Answer 2

You are probably confusing with tests where various random changes are made to the input data, and the reaction is checked.
Since accidental editing in the code will break the program itself and it will stupidly not start.

Answer 3

Um, almost any character, in almost any part of the code, will kill your code, you are confusing something.

Answer 4

Perhaps you need to change not the code, but the data. Then it is called "fixtures" (Test fixture). Generate them yourself and in the tests describe the desired result for each.