Yes I think part of the problem is that one has to get down to specifics in order to address the topics the OP wants to know about. Unit testing in Java is very different from unit testing browser-side JavaScript to pick an extreme example.
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This is difficult to answer without knowing what kind of problems you're trying to avoid or how the code (product?) is being modelled.
Can you shed any light on that?
Yes I think part of the problem is that one has to get down to specifics in order to address the topics the OP wants to know about. Unit testing in Java is very different from unit testing browser-side JavaScript to pick an extreme example.