Integration Test with_routing bug

integration_with_routing.rb

# typed: true
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", github: "rails/rails", branch: "main"
end

require "action_controller/railtie"

class TestApp < Rails::Application
  config.root = __dir__
  config.hosts << "www.example.com"
  config.secret_key_base = "secret_key_base"

  config.logger = Logger.new($stdout)
  Rails.logger  = config.logger

  routes.draw do
    get "/" => "test#index"
  end
end

class TestController < ActionController::Base
  include Rails.application.routes.url_helpers

  def index
    render(plain: "Home")
  end
end

require "minitest/autorun"
require "rack/test"

class TestControllerTest < ActionDispatch::IntegrationTest
  def test_returns_success
    with_routing do |routes|
      routes.draw do
        get "/test" => "test#index"
      end
      get("/test")
      assert_response(:ok)
    end
  end

  private

  def app
    Rails.application
  end
end