Use string eval instead of define_method for integration session me…

…thod delegation

This is an alternative of b7e591a and a43de73.

Handling `if options.any?` is not preferable solution for kwargs.

actionpack/lib/action_dispatch/testing/integration.rb

@@ -354,20 +354,22 @@ def remove! # :nodoc:
       end
 
       %w(get post patch put head delete cookies assigns follow_redirect!).each do |method|
-        define_method(method) do |*args, **options|
-          # reset the html_document variable, except for cookies/assigns calls
-          unless method == "cookies" || method == "assigns"
-            @html_document = nil
-          end
+        # reset the html_document variable, except for cookies/assigns calls
+        unless method == "cookies" || method == "assigns"
+          reset_html_document = "@html_document = nil"
+        end
 
-          result = if options.any?
-            integration_session.__send__(method, *args, **options)
-          else
-            integration_session.__send__(method, *args)
+        definition = RUBY_VERSION >= "2.7" ? "..." : "*args"
+
+        module_eval <<~RUBY, __FILE__, __LINE__ + 1
+          def #{method}(#{definition})
+            #{reset_html_document}
+
+            result = integration_session.#{method}(#{definition})
+            copy_session_variables!
+            result
           end
-          copy_session_variables!
-          result
-        end
+        RUBY
       end
 
       # Open a new session instance. If a block is given, the new session is