I take a pragmatic approach to Unit tests so find some use but don't feel the 100% gold standard of coverage is realistic or even sensible to aspire too but in response to Q3) never - but then I'd return the question When you deploy an app WITH 100% coverage how can you be confident that there are no regressions? I'm pretty sure the answer is never too as 100% test coverage doesn't prevent 100% of bugs.
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