testing - Deleberate Malware Insertion -

This question asked me to sit down for a while. I was thinking that malware is not an example of negligence by putting malware in the code that you are developing. It is a test process, is not it? I am sure that during the development of malware software, they need some kind of testing process so that they can see how much good it is with his / her software with malware. And when developing a software, does the developer or the testers not try to break the software and exploit it to see its weakness, and how well does it work to evaluate its ability, attribution, etc.?

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The answer to this question depends on how you define malware if you call it an attacker (malicious ), You will not allow malware to be inserted into your code, if it is for test reasons, you will be making it more secure instead.