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The Importance of Test Coverage
I would say it's easier than it looks because most of the projects that we have been working on for the last 15 years, the test coverage is not very high. Even if the coverage is high, they don't consider many cases. So breaking the code is not very difficult. On top of that, doing some exploratory testing and thinking of what are the edges of the system and how to break it,. I'll say an essential skill that you should have also. But often it is not. The critical part is that there are no enough unit tests to make the code maintainable with ease.