[monitoring-plugins] Fix opttest script

[Lorenz Kästle]

 Module: monitoring-plugins
 Branch: master
 Commit: b982e12ecfee9db869d443d2a8524182b7d09b13
 Author: Lorenz Kästle <12514511+RincewindsHat at users.noreply.github.com>
   Date: Wed Feb 19 19:43:40 2025 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=b982e12e

Fix opttest script

---

 tools/opttest.pl | 31 +++++++++++++++++++++++++------
 1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/tools/opttest.pl b/tools/opttest.pl
index 96c4fb0a..56a5c88f 100755
--- a/tools/opttest.pl
+++ b/tools/opttest.pl
@@ -28,22 +28,41 @@ for my $prog (keys %progs) {
 
 	$idx = 1;
 	$output = `$prog -h 2>&1`;
-	if($?) {$state++;print "$prog failed test $idx\n";}
+	if(($? >> 8) != 3) {
+		$state++;
+		print "$prog failed test $idx (help exit code (short form))\n";
+		exit(1);
+	}
+
 	unless ($output =~ m/$progs{$prog}/ms) {
-		$idx++; $state++;print "$output\n$prog failed test $idx\n";
+		$idx++;
+		$state++;
+		print "$output\n$prog failed test $idx\n";
 	}
 
 	$idx++;
 	`$prog --help 2>&1 > /dev/null`;
-	if($?) {$state++;print "$prog failed test $idx\n";}
+	if(($? >> 8) != 3) {
+		$state++;
+		print "$prog failed test $idx (help exit code (long form))\n";
+		exit(1);
+	}
 
 	$idx++;
-		`$prog -V 2>&1 > /dev/null`;
-	if($?) {$state++;print "$prog failed test $idx\n";}
+	`$prog -V 2>&1 > /dev/null`;
+	if(($? >> 8) != 3) {
+		$state++;
+		print "$prog failed test $idx (version exit code (short form))\n";
+		exit(1);
+	}
 
 	$idx++;
 	`$prog --version 2>&1 > /dev/null`;
-	if($?) {$state++;print "$prog failed test $idx\n";}
+	if(($? >> 8) != 3) {
+		$state++;
+		print "$prog failed test $idx (version exit code (long form))\n";
+		exit(1);
+	}
 
 	print "$prog ($idx tests) ";
 	ok $state,0;