Rakefile in pws-otp-0.9.0 vs Rakefile in pws-otp-0.9.1

@@ -30,9 +30,13 @@
 # # #
 # Run specs
 
 desc "#{gemspec.name} | Spec"
 task :spec do
-  sh "for file in spec/*_spec.rb; do ruby $file; done"
+  if RbConfig::CONFIG['host_os'] =~ /mswin|mingw/
+    sh "for %f in (spec/\*.rb) do ruby spec/%f"
+  else
+    sh "for file in spec/*.rb; do ruby $file; done"
+  end
 end
 task default: :spec