A couple of relevant threads:

All of this seems to indicate that what you want is unfortunately not directly possible. One possible solution, although not the most satisfying, is to abstract the test out into a function that can be mocked...

sub check_perms {
    my $filename = shift;
    return -f -w -x $filename;
}
check_perms("filename") or die;

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In reply to Re: Overriding filetest operators via overriding stat()? by haukex
in thread Overriding filetest operators via overriding stat()? by perlancar

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