I usually aim for 80% coverage from unit tests alone. 100% is definitely not achievable without wasting time for real. Problem with integration tests is that, before you know it, people start using it to test business logic, just because in a way, is more convenient (not easier or less verbose, just more convenient: no mocks/stubs, flows that translate 100% to user flows, tools that are more familiar, blackboxed etc)
In any case, I liked your comment because you're pointing out that in the end all of them are tools and each project is different.
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I usually aim for 80% coverage from unit tests alone. 100% is definitely not achievable without wasting time for real. Problem with integration tests is that, before you know it, people start using it to test business logic, just because in a way, is more convenient (not easier or less verbose, just more convenient: no mocks/stubs, flows that translate 100% to user flows, tools that are more familiar, blackboxed etc)
In any case, I liked your comment because you're pointing out that in the end all of them are tools and each project is different.