rails bug report with system test with miniproxy

test_rails_system.rb

# 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'
  gem 'rails', '~> 6.0.0'
  gem 'capybara'
  gem 'selenium-webdriver', require: false
  gem 'cuprite'
  gem 'miniproxy'
end

require 'action_controller/railtie'

class TestApp < Rails::Application
  config.root = __dir__
  config.hosts << '127.0.0.1'
  secrets.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'
require 'capybara/rails'
require 'capybara/minitest'
require 'capybara/cuprite'
require 'miniproxy'

Capybara.server = :webrick
Capybara.javascript_driver = :cuprite
Capybara.register_driver(:cuprite) do |app|
  driver = Capybara::Cuprite::Driver.new(
    app,
    window_size: [1200, 800],
    js_errors: true,
    browser_options: {
      'ignore-certificate-errors' => nil
    }
  )
  driver.set_proxy(MiniProxy.host, MiniProxy.port)
  driver
end


class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  driven_by Capybara.javascript_driver
end

class BugTest < ApplicationSystemTestCase
  test 'visits page' do
    MiniProxy.reset

    MiniProxy.stub_request(method: "GET", url: /google.com.ua/, response: {
      headers: { "Foo" => "bar" },
      code: 200,
      body: "test google azaza"
    })

    page.driver.browser.goto 'http://google.com.ua'
    assert_text 'test google azaza'

    MiniProxy.ignore_all_requests
    MiniProxy.stop
  end
end