This spec actually depends on fchdir being available

Author: headius

core/dir/chdir_spec.rb

@@ -177,7 +177,7 @@ def to_str;  DirSpecs.mock_dir; end
       dir.close
     end
 
-    platform_is_not :windows do
+    guard -> { Dir.respond_to? :fchdir } do
       it "does not raise an Errno::ENOENT if the original directory no longer exists" do
         dir_name1 = tmp('testdir1')
         dir_name2 = tmp('testdir2')