1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 6a1a1ccf80..fe1e23b656 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -520,4 +520,14 @@ class TestRefinement < Test::Unit::TestCase
     }
     assert_equal({c2 => c2_ext}, m2.refinements)
   end
+
+  def test_refine_without_block
+    c1 = Class.new
+    e = assert_raise(ArgumentError) {
+      Module.new do
+        refine c1
+      end
+    }
+    assert_equal("no block given", e.message)
+  end
 end