1 files changed, 13 insertions, 0 deletions
diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index ecc7153649..bf88126973 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -744,6 +744,7 @@ class TestRefinement < Test::Unit::TestCase
                  PrependIntoRefinement::User.invoke_baz_on(x))
   end
 
+  PrependAfterRefine_CODE = <<-EOC
   module PrependAfterRefine
     class C
       def foo
@@ -777,6 +778,18 @@ class TestRefinement < Test::Unit::TestCase
       prepend Mixin
     end
   end
+  EOC
+  eval PrependAfterRefine_CODE
+
+  def test_prepend_after_refine_wb_miss
+    assert_normal_exit %Q{
+      GC.stress = true
+      10.times{
+        #{PrependAfterRefine_CODE}
+        undef PrependAfterRefine
+      }
+    }
+  end
 
   def test_prepend_after_refine
     x = eval_using(PrependAfterRefine::M,