How to uncoverable the last else in an if-elsif-else?

[macrotex]

How to uncoverable the last else in an if-elsif-else?

[dolmen]

It is a bad idea to try to cheat with what Devel::Cover reports.
If you want 100% code coverage, you should instead fix your testsuite:

use Test::Exception;
throws_ok { mysub(0) } 'this should never happen', 'unexpected case';

[macrotex]

While I agree that in most circumstances you want to try and achieve full coverage, there are instances and circumstances where it is either very difficult or impossible to generate full coverage in testing (e.g., external faults that are hard to simulate).

[dolmen]

I think that your problem is that you fixed 100% code coverage as an aim to reach. That's broken, as 100% doesn't mean much anyway: that doesn't measure if you tested all combinations of code branches.

[pjcj]

I don't disagree with what dolmen says, but I also think that there are times when you know that you cannot exercise some code, for whatever reason, and in such cases it is useful to be able to mark the code such that it doesn't keep showing up as an error, thus making real problems harder to see.

In this particular case, add the following comment on the line before if ($x > 0):

uncoverable branch false count:2

This indicates that the second branch coming up (this is how perl models elsif) should never be false. If it is, it will be marked as an error.

ac4e370 documents this, to a certain extent.