1 files changed, 10 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/routing/concerns_test.rb b/actionpack/test/dispatch/routing/concerns_test.rb
index 8600da32ad..0289f38ba7 100644
--- a/actionpack/test/dispatch/routing/concerns_test.rb
+++ b/actionpack/test/dispatch/routing/concerns_test.rb
@@ -103,4 +103,14 @@ class RoutingConcernsTest < ActionDispatch::IntegrationTest
 
     assert_equal "No concern named foo was found!", e.message
   end
+
+  def test_concerns_executes_block_in_context_of_current_mapper
+    mapper = ActionDispatch::Routing::Mapper.new(ActionDispatch::Routing::RouteSet.new)
+    mapper.concern :test_concern do
+      resources :things
+      return self
+    end
+
+    assert_equal mapper, mapper.concerns(:test_concern)
+  end
 end