Verify that route constraints respond to the expected messages instead of silently failing to enforce the constraint

1 files changed, 15 insertions, 0 deletions

diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index 8e4339aa0c..e1ce3648e8 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -3593,6 +3593,21 @@ class TestFormatConstraints < ActionDispatch::IntegrationTest
   end
 end
 
+class TestCallableConstraintValidation < ActionDispatch::IntegrationTest
+
+  def test_constraint_with_object_not_callable
+    assert_raise(ArgumentError) do
+      ActionDispatch::Routing::RouteSet.new.tap do |app|
+        app.draw do
+          ok = lambda { |env| [200, { 'Content-Type' => 'text/plain' }, []] }
+          get '/test', to: ok, constraints: Object.new
+        end
+      end
+    end
+  end
+
+end
+
 class TestRouteDefaults < ActionDispatch::IntegrationTest
   stub_controllers do |routes|
     Routes = routes