Rspec + Capybara：未定义 last_response

Question

我正在使用Rspec + Capybara设置我的测试环境，但是我遇到了undefined last_response。我在网上和SO上搜索了一些关于版本、使用git仓库而不是rubygem源等方面的信息...但对我来说都没有什么帮助。

下面是回溯信息： rspec --backtrace spec/controllers/api/plist/providers_listing_spec.rb 失败：

1) Api::Plist::ProvidersController should return a successfull plist containing a list of providers
 Failure/Error: last_response.status.shoud be_success
 NameError:
   undefined local variable or method `last_response' for #<RSpec::Core::ExampleGroup::Nested_1:0x105658e10>
 # ./.gems/ruby/1.8/gems/rspec-expectations-2.6.0/lib/rspec/matchers/method_missing.rb:9:in `method_missing'
 # ./.gems/ruby/1.8/gems/actionpack-3.0.5/lib/action_dispatch/testing/assertions/routing.rb:175:in `method_missing'
 # ./spec/controllers/api/plist/providers_listing_spec.rb:19
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:48:in `instance_eval'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:48:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:107:in `with_around_hooks'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:45:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:294:in `run_examples'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:290:in `map'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:290:in `run_examples'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:262:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `map'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/reporter.rb:12:in `report'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:21:in `run'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:80:in `run_in_process'
 # /Library/Ruby/Gems/1.8/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:69:in `run'`

这是我的用于测试的宝石配置：

gem 'ruby-prof' # perf
gem 'rspec-rails', :git => 'git://github.com/rspec/rspec-rails.git'
gem 'shoulda' # Shoulda
gem 'factory_girl_rails' #=> mocking
gem 'capybara', :git => "http://github.com/jnicklas/capybara.git" 
gem 'database_cleaner'

gem 'rb-fsevent', :require => false if RUBY_PLATFORM =~ /darwin/i #guard mac dependency

gem 'guard-livereload' # browser reloading
gem 'guard-rspec'
gem 'guard-test'
gem 'growl' #grow notification

我正在使用database_clearner来处理MongoDB数据库...

直到现在，我还没有真正使用：

require 'spec_helper'

describe Api::Plist::ProvidersController, :type => :api do
  let (:user) {Factory(:confirmed_user)}
  let (:api_account) {user.new_api_account}
  let (:api_token) {api_account.authentication_token}
  let (:email) {api_account.email}

  it "should return a successfull plist containing a list of providers" do
    get 'index', :auth_token => api_token, :email => email
    last_response.status.shoud be_success
    last_response.body.should eql({:sucess => true}.to_plist.to_s)
  end
end

以下是我已经阅读的帖子，尽管它们主要讨论webrat：

• http://codingfrontier.com/integration-testing-setup-with-rspec-2-and-ca
• https://github.com/rspec/rspec-rails/issues/174
• ...

如果有人对该怎么做，使用哪个gem版本有任何想法吗？

- ProxyGear

Answer 1

You can add...

config.include Rack::Test::Methods

将以下代码添加到你的spec_helper.rb文件中，这将会在所有测试中添加last_response等方法。

但是，你可能并不需要这样做，更好的做法是按需从模块中引入。在spec/support文件夹中创建一个helper模块，然后添加以下代码：

module ApiHelper
  include Rack::Test::Methods
  def app
    Rails.application
  end
end

RSpec.configure do |c|
  c.include ApiHelper, type: :api
end

现在，你所拥有的:type => :api将会实际执行某些操作，即将Rack::Test::Methods添加到该规范中。

describe Api::Plist::ProvidersController, :type => :api do
  # etc
end

- IAmNaN

Answer 2

last_response 是 rack/test 的一个东西。如果你没有使用它，就需要将其移除。

- Achilles

Answer 3

这是对Rspec的误解。 "last_response"并不存在。它应该通过支持模块或其他方式提供。

- ProxyGear