Windows guard

Author: eregon

core/process/spawn_spec.rb

@@ -567,12 +567,14 @@ def child_pids(pid)
     end
   end
 
-  it "redirects non-default file descriptor to itself" do
-    File.open(@name, 'w') do |file|
-      -> do
-        Process.wait Process.spawn(
-          ruby_cmd("f = IO.new(#{file.fileno}, 'w'); f.print(:bang); f.flush"), file.fileno => file.fileno)
-      end.should output_to_fd("bang", file)
+  platform_is_not :windows do
+    it "redirects non-default file descriptor to itself" do
+      File.open(@name, 'w') do |file|
+        -> do
+          Process.wait Process.spawn(
+            ruby_cmd("f = IO.new(#{file.fileno}, 'w'); f.print(:bang); f.flush"), file.fileno => file.fileno)
+        end.should output_to_fd("bang", file)
+      end
     end
   end