commit d779139859cb0fd1635ac702652acf54afe09b1a
Author: Reini Urban <rurban@cpan.org>
Date:   Sun Feb 19 09:35:12 2017 +0100

    avoid plan twice on cperl
    
    cperl sets Have_Plan on invalid plan args. upstream bug

diff --git lib/Test/Script.pm lib/Test/Script.pm
index fc4690f..4fa921b 100644
--- lib/Test/Script.pm
+++ lib/Test/Script.pm
@@ -68,7 +68,7 @@ sub import {
   my $pack = caller;
   my $test = Test::Builder->new;
   $test->exported_to($pack);
-  $test->plan(@_) if @_;
+  $test->plan(@_) if grep /^tests$/, @_;
   foreach ( @EXPORT ) {
     $self->export_to_level(1, $self, $_);
   }