"Having a good test coverage encourages developers to make changes more confidently..."
How many % of the codebase should be covered with tests in your opinion?
It's not just a number.
It's also the importance. The more important the bit of logic (and the more other modules depend on it) the better it should be tested.
Looking at a single number is not productive because you can always increase coverage by adding more tests to not-so-important code.
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