1 files changed, 13 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 6673852d9c..e72a6ab8c9 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -669,6 +669,19 @@ class TestModule < Test::Unit::TestCase
     m.instance_eval { remove_const(:Foo) }
   end
 
+  class Bug9413
+    class << self
+      Foo = :foo
+    end
+  end
+
+  def test_singleton_constants
+    bug9413 = '[ruby-core:59763] [Bug #9413]'
+    c = Bug9413.singleton_class
+    assert_include(c.constants(true), :Foo, bug9413)
+    assert_include(c.constants(false), :Foo, bug9413)
+  end
+
   def test_frozen_class
     m = Module.new
     m.freeze