First, I tried scanning lib-authtest.cgi---nothing happened. Then I tried it as "lib-authtest": bingo. You'll also need to use a dumper for $value. Here's what worked for me on a hybrid Linux system:

#!/usr/bin/perl -l

use strict;
use autodie;
use warnings;
use Module::ScanDeps;
use Data::Dumper::Concise;

my $hash_ref = scan_deps(
    files    => [ '/root/Desktop/lib-authtest' ],
    recurse  => 1,
);

print "Now starting: \n";

while (my ($key, $value) = each(%{$hash_ref})) {
     print  $key, Dumper($value);
}
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