I always achieve 100% relevant code coverage. I just set up a test with one input which tests my main(), which then obviously calls all the relevant parts of th

I always achieve 100% relevant code coverage. I just set up a test with one input which tests my main(), which then obviously calls all the relevant parts of the code. Or am I missing something in the definition of code coverage? I don't see anyone using exhaustive-input tests, which is usually impossible anyway, or splitting up each branch of conditionals into separate functions so as to make them unit testable. I only see people splitting up the code into arbitrary function blocks, having at least one unit test for such function and then declaring all lines of code of that function as test-covered.