pass the starting env and session to build_request

actionpack/lib/action_controller/test_case.rb

@@ -516,7 +516,7 @@ def setup_controller_request_and_response
           end
         end
 
-        @request          = build_request
+        @request          = build_request({}, TestRequest.new_session)
         @request.env["rack.request.cookie_hash"] = {}.with_indifferent_access
         @response         = build_response @response_klass
         @response.request = @request
@@ -527,8 +527,8 @@ def setup_controller_request_and_response
         end
       end
 
-      def build_request
-        TestRequest.new({}, TestRequest.new_session)
+      def build_request(env, session)
+        TestRequest.new(env, session)
       end
 
       def build_response(klass)

actionpack/lib/action_dispatch/testing/assertions/routing.rb

@@ -183,7 +183,7 @@ def recognized_request_for(path, extras = {}, msg)
           end
 
           # Assume given controller
-          request = build_request
+          request = build_request({}, ActionController::TestRequest.new_session)
 
           if path =~ %r{://}
             fail_on(URI::InvalidURIError, msg) do