Fix warning on arg forwarding in integration tests

Kwargs need to be forwarded for this method_missing to avoid warnings in Ruby 2.7.

actionpack/lib/action_dispatch/testing/integration.rb

@@ -432,6 +432,7 @@ def method_missing(method, *args, &block)
           super
         end
       end
+      ruby2_keywords(:method_missing) if respond_to?(:ruby2_keywords, true)
     end
   end
 

actionpack/test/controller/integration_test.rb

@@ -170,9 +170,10 @@ def method_missing(name, *args)
 class IntegrationTestUsesCorrectClass < ActionDispatch::IntegrationTest
   def test_integration_methods_called
     reset!
+    headers = { "Origin" => "*" }
 
-    %w( get post head patch put delete ).each do |verb|
-      assert_nothing_raised { __send__(verb, "/") }
+    %w( get post head patch put delete options ).each do |verb|
+      assert_nothing_raised { __send__(verb, "/", headers: headers) }
     end
   end
 end