Rails 4.2 中的自定义 HTTP headers Minitest 测试失败

Minitest tests fail with custom HTTP headers in Rails 4.2

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

以及对应的控制器:

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

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

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

如果我将 Accept-Language 更改为 HTTP_ACCEPT_LANGUAGE 那个 测试就会通过。

根据 Rails documentation,我的测试应该有效。我用谷歌搜索了这个问题,用几种不同的方式寻找答案,但一无所获。 Stack Overflow 上有几个与此类似的问题,但是 none 这些问题的答案或建议解决了我的问题。

我错过了什么?

环境:

Rails 测试指南告诉我们 Setting Headers:

"HTTP headers and CGI variables can be set directly on the @request instance variable:..."

所以你需要这样写:

@request.headers["Accept-Language"] = "zh-cn, en-us"

我认为最好不要在before方法中设置header,而是直接在测试中设置。因此,每次您只设置此测试所需的 header 。你不需要先设置cookie,然后再删除它。

Rails 通过以下方式为自定义 HTTP header 设置 request.env 变量:

  • 将 header 转换为全部大写
  • 用下划线替换破折号
  • 前置 "HTTP_"

因此您可以在测试中设置 request.headers["Accept-Language"],并在控制器中使用 request.env["HTTP_ACCEPT_LANGUAGE"] 访问该值。同样,您在测试中设置 request.headers["CloudFront-Viewer-Country"],并在控制器中使用 request.env["HTTP_CLOUDFRONT_VIEWER_COUNTRY"] 访问该值。