1 files changed, 4 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index e3b433e2cb..c7acac05f9 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -981,4 +981,8 @@ class TestModule < Test::Unit::TestCase
     c.public_constant(:FOO)
     assert_equal("foo", c::FOO)
   end
+
+  def test_constants_with_private_constant
+    assert(!(::TestModule).constants.include?(:PrivateClass))
+  end
 end