1 files changed, 13 insertions, 0 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index 87d5f0f79e..ade680c55b 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1033,4 +1033,17 @@ q.pop
     assert_not_predicate(status, :signaled?, FailDesc[status, bug9751, output])
     assert_predicate(status, :success?, bug9751)
   end if Process.respond_to?(:fork)
+
+  def test_subclass_no_initialize
+    t = Module.new do
+      break eval("class C\u{30b9 30ec 30c3 30c9} < Thread; self; end")
+    end
+    t.class_eval do
+      def initialize
+      end
+    end
+    assert_raise_with_message(ThreadError, /C\u{30b9 30ec 30c3 30c9}/) do
+      t.new {}
+    end
+  end
 end