Use `args` instead of `*args` in `kwargs_request?` method

`*args` is not required here and should be avoided when not necessary
because `*args` are slower than `args` and create unnecessary array
allocations.

actionpack/lib/action_controller/test_case.rb

@@ -604,7 +604,7 @@ module ActionController
       def process(action, *args)
         check_required_ivars
 
-        if kwarg_request?(*args)
+        if kwarg_request?(args)
           parameters, session, body, flash, http_method, format, xhr = args[0].values_at(:params, :session, :body, :flash, :method, :format, :xhr)
         else
           http_method, parameters, session, flash = args
@@ -745,7 +745,7 @@ module ActionController
       private
 
       def process_with_kwargs(http_method, action, *args)
-        if kwarg_request?(*args)
+        if kwarg_request?(args)
           args.first.merge!(method: http_method)
           process(action, *args)
         else
@@ -757,7 +757,7 @@ module ActionController
       end
 
       REQUEST_KWARGS = %i(params session flash method body xhr)
-      def kwarg_request?(*args)
+      def kwarg_request?(args)
         args[0].respond_to?(:keys) && (
           (args[0].key?(:format) && args[0].keys.size == 1) ||
           args[0].keys.any? { |k| REQUEST_KWARGS.include?(k) }

actionpack/lib/action_dispatch/testing/integration.rb

@@ -81,7 +81,7 @@ module ActionDispatch
       #
       #   xhr :get, '/feed', params: { since: 201501011400 }
       def xml_http_request(request_method, path, *args)
-        if kwarg_request?(*args)
+        if kwarg_request?(args)
           params, headers, env = args.first.values_at(:params, :headers, :env)
         else
           params = args[0]
@@ -291,7 +291,7 @@ module ActionDispatch
         end
 
         def process_with_kwargs(http_method, path, *args)
-          if kwarg_request?(*args)
+          if kwarg_request?(args)
             process(http_method, path, *args)
           else
             non_kwarg_request_warning if args.present?
@@ -300,7 +300,7 @@ module ActionDispatch
         end
 
         REQUEST_KWARGS = %i(params headers env xhr)
-        def kwarg_request?(*args)
+        def kwarg_request?(args)
           args[0].respond_to?(:keys) && args[0].keys.any? { |k| REQUEST_KWARGS.include?(k) }
         end