Build an app instance compatible with with_routing

As of rails/rails#49819 the internals of
`ActionDispatch::Assertions::RoutingAssertions` changed and the way we
were building our app instance was no compatible with it. This gets us
back to passing tests for Rails 7.2+. I hope 🤞

Author: stevenharman

test/helper.rb

@@ -46,14 +46,14 @@ class ActionDispatch::IntegrationTest < ActiveSupport::TestCase
 
   def self.build_app(routes, options)
     RoutedRackApp.new(routes || ActionDispatch::Routing::RouteSet.new) do |middleware|
-      middleware.use ActionDispatch::Session::ActiveRecordStore, options.reverse_merge(:key => '_session_id')
       middleware.use ActionDispatch::DebugExceptions
       middleware.use ActionDispatch::ActionableExceptions
       middleware.use ActionDispatch::Callbacks
       middleware.use ActionDispatch::Cookies
       middleware.use ActionDispatch::Flash
       middleware.use Rack::MethodOverride
       middleware.use Rack::Head
+      middleware.use ActionDispatch::Session::ActiveRecordStore, options.reverse_merge(key: "_session_id")
       yield(middleware) if block_given?
     end
   end
@@ -71,7 +71,8 @@ def with_test_route_set(options = {})
           actions.each { |action| get action, controller: "#{controller_namespace}/test" }
         end
 
-        @app = self.class.build_app(set, options)
+        self.class.app = self.class.build_app(set, options)
+
         yield
       end
     end

test/logger_silencer_test.rb

@@ -39,7 +39,9 @@ def setup
   def test_log_silencer_with_logger_not_raise_exception
     with_logger ActiveSupport::Logger.new(Tempfile.new("tempfile")) do
       with_test_route_set do
-        get "/set_session_value"
+        assert_nothing_raised do
+          get "/set_session_value"
+        end
       end
     end
   end