Delegate respond_to? in ActionView::Helpers::ControllerHelper

Since methods defined in the controller helper are mostly delegated to
the controller, delegate respond_to? as well, so that for example
`respond_to?(:params)` behaves as expected.

1 files changed, 11 insertions, 0 deletions

diff --git a/actionview/test/template/controller_helper_test.rb b/actionview/test/template/controller_helper_test.rb
index 8dd0cedb75..ea0e790d9b 100644
--- a/actionview/test/template/controller_helper_test.rb
+++ b/actionview/test/template/controller_helper_test.rb
@@ -18,4 +18,15 @@ class ControllerHelperTest < ActionView::TestCase
 
     assert_nil default_form_builder
   end
+
+  def test_respond_to
+    @controller = OpenStruct.new
+    assign_controller(@controller)
+    assert_not respond_to?(:params)
+    assert respond_to?(:assign_controller)
+
+    @controller.params = {}
+    assert respond_to?(:params)
+    assert respond_to?(:assign_controller)
+  end
 end