spec: explicity require ostruct for OpenStruct

thefloweringash · thefloweringash · commit 369bc208c93b · 2026-01-08T19:59:45.000+09:00
diff --git a/spec/unit/persistent_enum_spec.rb b/spec/unit/persistent_enum_spec.rb
@@ -4,6 +4,7 @@
 
 require 'persistent_enum'
 require 'byebug'
+require 'ostruct'
 
 require_relative '../spec_helper'
 
