Thanks for the appreciation and the hints.
Went through Michael Bolton’s articles a year ago when I had no idea from where to start tackling the functional coverage.
About your question, I don’t see this approach, of creating a map of functions, feasible for an app with such a big number of tests. It might become overwhelming keeping the map up to date and then do the correlation with the automated tests.
I’m still looking for a solution that covers that scenario too.