ruby-on-rails - Minitest 测试因 Rails 4.2 中的自定义 HTTP header 而失败

Question

我无法使用 minitest 在我的 Rails 4.2 应用程序中成功测试自定义 HTTP 变量——出于某种原因，Rails 似乎根本无法识别它们。

我有以下测试:

require "test_helper"

describe ApplicationController do
  tests HomeController

  before do
    cookies[:locale] = "ru"
    request.headers["Accept-Language"] = "zh-cn, en-us"
    request.headers["CloudFront-Viewer-Country"] = "FR"
    I18n.default_locale = :en
  end

  it "sets locale from URL params first" do
    get :index, locale: "de"
    I18n.locale.must_equal :de
  end

  it "sets locale from a cookie second" do
    get :index
    I18n.locale.must_equal :ru
  end

  it "sets locale from Accept-Language header third" do
    cookies.delete :locale
    get :index
    I18n.locale.must_equal :"zh-CN"
  end

  it "sets locale from CloudFront-Viewer-Country header last" do
    cookies.delete :locale
    request.headers["Accept-Language"] = nil
    get :index
    I18n.locale.must_equal :fr
  end
end

以及相应的 Controller :

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  before_filter :set_locale

  def default_url_options(options = {})
    { locale: I18n.locale }.merge options
  end

  private

  def set_locale
    I18n.locale = params[:locale] ||
                  cookies[:locale] ||
                  extract_locale_from_accept_language_header ||
                  set_locale_from_cloudfront_viewer_country ||
                  I18n.default_locale

    unless request.fullpath =~ /^\/(?:[a-z]{2,2})(?:[-|_](?:[A-Z]{2,2}))?/
      redirect_to %(#{request.protocol}#{request.host}/#{I18n.locale}#{request.fullpath unless request.fullpath == "/"}), status: :found
    end
  end

  def extract_locale_from_accept_language_header
    if request.env["Accept-Language"]
      request.env["Accept-Language"].scan(/(?:[a-z]{2,2})(?:[-|_](?:[A-Z]{2,2}))?/i).first
    end
  end

  def set_locale_from_cloudfront_viewer_country
    case request.env["CloudFront-Viewer-Country"]
    when "FR"
      return :fr
    else
      return I18n.default_locale
    end
  end
end

最后两个测试失败，因为 Rails 似乎无法识别我设置的 HTTP header 变量，并且一切都落入默认语言环境:

Failure:
ApplicationController#test_0004_sets locale from CloudFront-Viewer-Country header last [/Users/aporter/Developer/com/wavetronix/www/test/controllers/application_controller_test.rb:33]
Minitest::Assertion: Expected: :fr
  Actual: :en

Failure:
ApplicationController#test_0003_sets locale from Accept-Language header third [/Users/aporter/Developer/com/wavetronix/www/test/controllers/application_controller_test.rb:26]
Minitest::Assertion: Expected: :"zh-CN"
  Actual: :en

如果我改变 Accept-Language至 HTTP_ACCEPT_LANGUAGE ，该测试然后通过。

根据 Rails documentation ，我的测试应该有效。我用谷歌搜索了这个问题的几种不同方式来寻找答案，但结果是空的。 Stack Overflow 上有一些与此类似的问题，但这些问题的答案或建议都没有解决我的问题。

我错过了什么？

环境:

Mac OS X 10.11.1

ruby 2.2.2

rails 4.2.4

迷你测试 5.8.0

Answer 1

Rails 设置了 request.env自定义 HTTP header 的变量:

将标题转换为全大写

用下划线替换破折号

前置“HTTP_”

所以你可以设置 request.headers["Accept-Language"]在测试中，并使用 request.env["HTTP_ACCEPT_LANGUAGE"] 访问该值在 Controller 中。同样，您设置 request.headers["CloudFront-Viewer-Country"]在测试中，并使用 request.env["HTTP_CLOUDFRONT_VIEWER_COUNTRY"] 访问该值在 Controller 中。