Basically I agree on the "it depends" argument that was given already. However, that approach can only work in a 1:1 mapping. Hence, not with integration/system tests.
I think it's much more interesting, to research better tooling for production/test code. One thing I'm particularly working on is a ReSharper plugin (github.com/matkoch/TestLinker) that provides navigation between the two entities, plus a few other things, like generating test stubs and detection of affected tests through production code changes.
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Basically I agree on the "it depends" argument that was given already. However, that approach can only work in a 1:1 mapping. Hence, not with integration/system tests.
I think it's much more interesting, to research better tooling for production/test code. One thing I'm particularly working on is a ReSharper plugin (github.com/matkoch/TestLinker) that provides navigation between the two entities, plus a few other things, like generating test stubs and detection of affected tests through production code changes.