Cannot send signal to process group on Windows

Author: nobu

tool/test-bundled-gems.rb

@@ -83,14 +83,16 @@
   if /mingw|mswin/ =~ RUBY_PLATFORM
     timeouts.delete(:TERM)      # Inner process signal on Windows
     group = :new_pgroup
+    pg = ""
   else
     group = :pgroup
+    pg = "-"
   end
   pid = Process.spawn(test_command, group => true)
   timeouts.each do |sig, sec|
     if sig
       puts "Sending #{sig} signal"
-      Process.kill("-#{sig}", pid)
+      Process.kill("#{pg}#{sig}", pid)
     end
     begin
       break Timeout.timeout(sec) {Process.wait(pid)}