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if ($test1 = $test2) {
   $comp = "EQUALS";
}  else  {
   $comp = "Does NOT Equal";
}

my $test1 = 123;
my $test2 = 456;
...
   $comp = "Does NOT Equal";
}
print "3. Test1: '$test1', test2: '$test2'\n";

=head2 C<decode_COMP3>

...
    else { $digits .= $sign; $sign = '?' };
    "$sign$digits"
};

sub decode_BCD {
    unpack "H*", $_[0];
};

use strict;
use Test::More tests => 4;
...
is decode_BCD("\x12\x34\x56","123456");
is decode_BCD("\x00\x34\x56","003456");
is decode_BCD("\x12","12");