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（来自“使用 Rails 6 进行敏捷 Web 开发”中的第 14 章） 我正在尝试运行一个系统测试，该测试涉及一个需要 /lib 目录中的文件的模型。该文件加载正常，代码在开发模式下的本地主机上运行良好，但是一旦我运行测试它就会出错：

Error:
OrdersTest#test_visiting_the_index:
DRb::DRbRemoteError: cannot load such file -- pago (LoadError)
    app/models/order.rb:1:in `<main>'

order.rb需要该文件的模型的摘录是：

require "pago"

class Order < ApplicationRecord
    enum pay_type: {
        "Cheque"                    => 0,
        "Credit card"           => 1,
        "Purchase order"    => 2
    }
    has_many :line_items, dependent: :destroy
    
    validates :name, :address, :email, presence: true
    validates :pay_type, inclusion: pay_types.keys
    
    def add_line_items_from_cart(cart)
        cart.line_items.each do |item|
            item.cart_id = nil
            line_items << item
        end
    end

    def charge!(pay_type_params)
        payment_details = {}
        payment_method = nil

        case pay_type
        when "Cheque"
            payment_method = :cheque
            payment_details[:routing] = pay_type_params[:routing_number]
            payment_details[:account] = pay_type_params[:account_number]
        when "Credit card"
            payment_method = :credit_card
            month,year = pay_type_params[:expiration_date].split(//)
            payment_details[:cc_num] = pay_type_params[:credit_card_number]
            payment_details[:expiration_month] = month
            payment_details[:expiration_year] = year
        when "Purchase order"
            payment_method = :po
            payment_details[:po_num] = pay_type_params[:po_number]
        end

        payment_result = Pago.make_payment(
            order_id: id,
            payment_method: payment_method,
            payment_details: payment_details
        )

        if payment_result.succeeded?
            OrderMailer.received(self).deliver_later
        else
            raise payment_result.error
        end
    end
end

摘自实际/lib/pago.rb：

require "ostruct"

class Pago
  
  def self.make_payment(order_id:,
                        payment_method:,
                        payment_details:)
    case payment_method
    when :cheque
      Rails.logger.info "Processing cheque: " +
        payment_details.fetch(:routing).to_s + "/" + 
        payment_details.fetch(:account).to_s
    when :credit_card
      Rails.logger.info "Processing credit_card: " +
        payment_details.fetch(:cc_num).to_s + "/" + 
        payment_details.fetch(:expiration_month).to_s + "/" + 
        payment_details.fetch(:expiration_year).to_s
    when :po
      Rails.logger.info "Processing purchase order: " +
        payment_details.fetch(:po_num).to_s
    else
      raise "Unknown payment_method #{payment_method}"
    end
    sleep 3 unless Rails.env.test?
    Rails.logger.info "Done Processing Payment"
    OpenStruct.new(succeeded?: true)
  end
end

我试图运行的测试文件： test/system/orders_test.rb

require "application_system_test_case"

class OrdersTest < ApplicationSystemTestCase
  include ActiveJob::TestHelper
  setup do
    @order = orders(:one)
  end

  test "visiting the index" do
    visit orders_url
    assert_selector "h1", text: "Orders"
  end

  test "destroying an Order" do
    visit orders_url
    page.accept_confirm do
      click_on "Destroy", match: :first
    end

    assert_text "Order was successfully destroyed"
  end

  test "check full payment with cheque flow" do
    LineItem.delete_all
    Order.delete_all

    visit store_index_url

    click_on 'Add to cart', match: :first

    click_on 'Checkout'

    fill_in 'order_name', with: 'Dave Thomas'
    fill_in 'order_address', with: '123 Main Street'
    fill_in 'order_email', with: 'dave@example.com'

    assert_no_selector "#order_routing_number"

    select 'Cheque', from: 'Pay type'
    fill_in 'Routing #', with: '123456'
    fill_in 'Account #', with: '678901'

    assert_selector "#order_routing_number"
    assert_selector "#order_account_number"

    perform_enqueued_jobs { click_button 'Place order' }
    
    orders = Order.all
    assert_equal 1, orders.size
    order = orders.first

    assert_equal 'Dave Thomas',       order.name
    assert_equal '123 Main Street',   order.address
    assert_equal 'dave@example.com',  order.email
    assert_equal 'Cheque',            order.pay_type 
    assert_equal 1, order.line_items.size     

    mail = ActionMailer::Base.deliveries.last
    assert_equal ['dave@example.com'],    mail.to
    assert_equal 'James Kemp<from@example.com>', mail[:from].value
    assert_equal 'Order received; thanks', mail.subject
  end


  test "check CC number for credit card payment choice" do
    visit store_index_url

    click_on 'Add to cart', match: :first

    click_on 'Checkout'

    fill_in 'order_name', with: 'Dave Thomas'
    fill_in 'order_address', with: '123 Main Street'
    fill_in 'order_email', with: 'dave@example.com'

    assert_no_selector "#order_credit_card_number"
    assert_no_selector "#order_expiration_date"

    select 'Credit card', from: 'Pay type'

    assert_selector "#order_credit_card_number"
    assert_selector "#order_expiration_date"
  end

  test "check PO number for purchase order payment choice" do
    visit store_index_url

    click_on 'Add to cart', match: :first

    click_on 'Checkout'

    fill_in 'order_name', with: 'Dave Thomas'
    fill_in 'order_address', with: '123 Main Street'
    fill_in 'order_email', with: 'dave@example.com'

    assert_no_selector "#order_po_number"

    select 'Purchase order', from: 'Pay type'

    assert_selector "#order_po_number"
  end

end

如果我运行 rails 控制台require 'pago'返回 true。我在各种配置和环境文件中没有看到任何关于问题可能是什么的线索。教程代码似乎与我的一样逐个字符。我只是无法弄清楚这里出了什么问题。任何人都可以帮忙吗？

我的 Gemfile 仅供参考（我已安装捆绑包）：

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

ruby '3.0.2'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails', branch: 'main'
gem 'rails', '~> 6.1.4', '>= 6.1.4.1'
# Use sqlite3 as the database for Active Record
gem 'sqlite3', '~> 1.4'
# Use Puma as the app server
gem 'puma', '~> 5.0'
# Use SCSS for stylesheets
gem 'sass-rails', '>= 6'
# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
gem 'webpacker', '~> 5.0'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.7'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use Active Model has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Active Storage variant
# gem 'image_processing', '~> 1.2'

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.4.4', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 4.1.0'
  # Display performance information such as SQL time and flame graphs for each request in your browser.
  # Can be configured to work on production as well see: https://github.com/MiniProfiler/rack-mini-profiler/blob/master/README.md
  gem 'rack-mini-profiler', '~> 2.0'
  gem 'listen', '~> 3.3'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 3.26'
  gem 'selenium-webdriver'
  # Easy installation and use of web drivers to run system tests with browsers
  gem 'webdrivers'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
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