showing coverage of functional tests without blind spots

Question

I have a production golang code and functional tests for it written not in golang. Functional tests run compiled binary. Very simplified version of my production code is her

Answer 1

In my pkglint project I have declared a package-visible variable:

var exit = os.Exit

In the code that sets up the test, I overwrite it with a test-specific function, and when tearing down a test, I reset it back to os.Exit.

This is a simple and pragmatic solution that works well for me, for at least a year of extensive testing. I get 100% branch coverage because there is no branch involved at all.