Question

我已按照 Everyday Rails Testing with RSpec 一书中的示例创建了一个自定义RSpec匹配器，用于重定向到登录页面（ requires_login 匹配器）。该匹配器的代码如下所示：

RSpec::Matchers.define :require_login do

  match do |actual|
    redirect_to Rails.application.routes.url_helpers.login_path
  end

  failure_message_for_should do |actual|
    "expected to require login to access the method"
  end

  failure_message_for_should_not do |actual|
    "expected not to require login to access method"
  end

  description do
    "redirect to the login form"
  end

end

然后在下面的示例中调用此匹配器：

describe "GET #edit" do

  it "requires login" do
    user = FactoryGirl.create(:user)
    get :edit, id: user
    expect(response).to require_login
  end

end # End GET #edit

出于某种原因，上述测试在以下情况下无效（即使它也检查重定向到登录路径）：

describe "GET #edit" do

  it "requires login" do
    user = FactoryGirl.create(:user)
    get :edit, id: user
    expect(response).to redirect_to login_path
  end

end # End GET #edit

我已多次查看我的代码以及上面提到的书中的示例，但找不到任何错误。任何有关如何正确实现此匹配器的见解将不胜感激。我也使用Ruby 2.0.0，Rails 3.2.13和RSpec-Rails 2.13.1。

解决方案（感谢Frederick Cheung的建议）

RSpec::Matchers.define :require_login do |attribute|

  match do |actual|
    expect(attribute).to redirect_to Rails.application.routes.url_helpers.login_path
  end

  failure_message_for_should do |actual|
    "expected to require login to access the method"
  end

  failure_message_for_should_not do |actual|
    "expected not to require login to access method"
  end

  description do
    "redirect to the login form"
  end

end

Answer 1

你的匹配块需要返回匹配匹配的匹配，但是当你返回的东西总是真的。

您可能希望对redirect_to匹配器采用类似的方法，该匹配器调用提供的assert_redirected_to的rails并根据是否引发ActiveSupport::TestCase::Assertion返回true / false

RSpec自定义重定向匹配器始终成功

1 个答案: