Thanks Corion. So all I can do is *for each* of my test files to first check if chrome is available (via your helper, e.g. https://metacpan.org/release/CORION/WWW-Mechanize-Chrome-0.71/source/t/helper.pm#L21) and skip all tests in that test file gracefully, so that the testers think that tests have been passed, albeit with a stderr message for the real users. Correct?

That is how I do it, but it may also make sense to simply skip the test using something like this:

use Test::More;

if( chrome_is_unavailable ) {
    plan skip_all => "Chrome / chromium not found/installed, skipping 
+test.";
    exit 0;
};

plan tests => $test_count;
...
done_testing();
[download]

got it thanks