The test suite scripts exit with non-zero exit code if unable to run executables.

tests/test_base.pl

@@ -19,6 +19,10 @@ sub run_prg {
   print "\n*** run_prg: prg = @prg ***\n";
   if ((-x @prg) || (-x $arg[0])) {
     my @out = `@prg`;
+    if ($?) {
+      my $exitcode = $? >> 8;
+      die "ERROR: non-zero exit code ($exitcode) received from @prg"
+    }
     print "run_prg: [out]=[@out]\n";
     return @out;
   } else {