Question

我有一个Rails 4应用程序，这是我的lib / foobar：

jan@rmbp ~/D/r/v/l/foobar> tree
.
├── foo_bar.rb
└── foobar_spec.rb

0 directories, 2 files

文件：

foobar_spec.rb

require "spec_helper"

describe "FooBar" do
  subject { FooBar.new }
  its(:foo) { should == "foo"}
  #stubbed version of test crashes
  #FooBar.stub(:foo).and_return("bar")
  #subject { FooBar.new }
  #its(:foo) { should == "bar"}

end

foo_bar.rb

class FooBar
  def foo
    "foo"
  end
end

spec_helper.rb：

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
# commented for zeus two runs bug
require 'rspec/autorun'
require 'capybara/rspec'

# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }

# Checks for pending migrations before tests are run.
# If you are not using ActiveRecord, you can remove this line.
ActiveRecord::Migration.check_pending! if defined?(ActiveRecord::Migration)

RSpec.configure do |config|

  config.include Devise::TestHelpers, :type => :controller
  config.include Features::SessionHelpers, type: :feature

  # ## Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr
  config.mock_with :rspec

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  config.use_transactional_fixtures = false

  config.before(:suite) do
    DatabaseCleaner.strategy = :truncation
  end

  config.before(:each) do
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end

  # If true, the base class of anonymous controllers will be inferred
  # automatically. This will be the default behavior in future versions of
  # rspec-rails.
  config.infer_base_class_for_anonymous_controllers = false

  # Run specs in random order to surface order dependencies. If you find an
  # order dependency and want to debug it, you can fix the order by providing
  # the seed, which is printed after each run.
  #     --seed 1234
  config.order = "random"
end

规范很好。但是当我取消注释这一行时：

# FooBar.stub(:foo).and_return("bar")

失败了：

/Users/jan/.rvm/gems/ruby-2.0.0-p247/gems/rspec-mocks-2.14.3/lib/rspec/mocks.rb:26:in `proxy_for': undefined method `proxy_for' for nil:NilClass (NoMethodError)

有什么问题？

编辑：此外，我似乎也无法使用webmock。

  stub_request(:post, "https://accounts.google.com/o/oauth2/token")
         .with(:body => { "client_id"     => CLIENT_ID,
                         "client_secret" => CLIENT_SECRET,
                         "refresh_token" => refresh_token, }
         ).to_return(:status => 200,
                     :body => File.read("#{$fixtures}/refresh_token.json"))

返回：

/Users/jan/Documents/ruby/vince.re/lib/youtube/you_tube_test.rb:9:in block in <top (required)>': undefined method stub_request'for ＆LT;分类：0x007f8159bbe7c0＆gt; （NoMethodError）

解：感谢@gotva告诉我有关存储在it块内的存根要求。这是我新的固定webmock测试，它运行良好：

  context "when token is nil it" do
    it "called refresh method" do
      YouTube.any_instance.should_receive(:refresh_auth_token).with(data["refresh"]) 
      YouTube.new(data["uid"], nil, data["refresh"])
    end
    it "refreshed the authentation token" do
      stub_request(:post, "https://accounts.google.com/o/oauth2/token")
            .with(:body => { "client_id"     => CLIENT_ID,
                        "client_secret" => CLIENT_SECRET,
                        "grant_type"=>"refresh_token",
                        "refresh_token" => data["refresh"], }
            ).to_return(:status => 200,
                        :body => File.read("#{$fixtures}/refresh_token.json"))
        yt = YouTube.new(data["uid"], nil, data["refresh"])
        yt.token.should == data["access_token"]
    end
  end

Answer 1

在我看来，使用这个存根

FooBar.stub(:foo).and_return("bar")

你正在尝试存根不存在的方法。方法foo是实例方法，但你是存根类方法。

如果你想要实例方法FooBar＃foo使用any_instance

FooBar.any_instance.stub(:foo).and_return("bar")

从评论中更新

在stub或it块中应用before。

新变种：

it 'place here some description for method foo' do
  FooBar.any_instance.stub(:foo).and_return("bar") 
  expect(FooBar.new.foo).to eql('bar')
end

或

# the order is important! 
describe "FooBar" do 
  before { FooBar.any_instance.stub(:foo).and_return("bar") } 
  subject { FooBar.new } 
  its(:foo) { should == "foo"} 
end

不能用Rspec存根

1 个答案: