It's failing for three reasons.

• Your first test throws an exception.
• You OS test fails.
• BAIL_OUT causes the process to exit with a non-successful return.

If you had had more tests in the file, those would fail too by virtue of your early bail out.

To skip all tests, you want the skip_all functionality.

use Test::More;

BEGIN {
   if ($^O =~ /^(?:MSWin|VMS|dos|MacOS|os2|epoc|cygwin)/i) {
      plan skip_all => "OS unsupported. It may or may not work, but yo
+u won't know since the tests are being skipped. Use at your own risk"
+;
   } else {
      plan tests => 1;
   }

   use_ok('Term::Menu::Hierarchical');
}
[download]

Or maybe you're really trying to do something other than confuse would-be users.

• Are you trying to prevent the installation of the module on those platforms? You'll need to muck around with Makefile.PL.

  if ($^O =~ /^(?:MSWin|VMS|dos|MacOS|os2|epoc|cygwin)) {
      die "OS unsupported\n";
  }
  [download]

• Are you trying to suppress the emails? Setup a mail filter.

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