Fix `helper_method` in `ActionView::TestCase` to allow keyword arguments

actionview/lib/action_view/test_case.rb

@@ -75,8 +75,9 @@ def helper_method(*methods)
           methods.flatten.each do |method|
             _helpers.module_eval <<-end_eval, __FILE__, __LINE__ + 1
               def #{method}(*args, &block)                    # def current_user(*args, &block)
-                _test_case.send(%(#{method}), *args, &block)  #   _test_case.send(%(current_user), *args, &block)
+                _test_case.send(:'#{method}', *args, &block)  #   _test_case.send(:'current_user', *args, &block)
               end                                             # end
+              ruby2_keywords(:'#{method}') if respond_to?(:ruby2_keywords, true)
             end_eval
           end
         end

actionview/test/template/test_case_test.rb

@@ -176,14 +176,14 @@ class ViewAssignsTest < ActionView::TestCase
   class HelperExposureTest < ActionView::TestCase
     helper(Module.new do
       def render_from_helper
-        from_test_case
+        from_test_case(suffix: "!")
       end
     end)
     test "is able to make methods available to the view" do
       assert_equal "Word!", render(partial: "test/from_helper")
     end
 
-    def from_test_case; "Word!"; end
+    def from_test_case(suffix: "?"); "Word#{suffix}"; end
     helper_method :from_test_case
   end