rspec - 用法拉第和 Rspec 打桩

Question

我有一个看起来像这样的模型:

class Gist
    def self.create(options)
    post_response = Faraday.post do |request|
      request.url 'https://api.github.com/gists'
      request.headers['Authorization'] = "Basic " + Base64.encode64("#{GITHUB_USERNAME}:#{GITHUB_PASSWORD}")
      request.body = options.to_json
    end
  end
end

和一个看起来像这样的测试:

require 'spec_helper'

describe Gist do
  context '.create' do
    it 'POSTs a new Gist to the user\'s account' do
      Faraday.should_receive(:post)
      Gist.create({:public => 'true',
                   :description => 'a test gist',
                   'files' => {'test_file.rb' => 'puts "hello world!"'}})
    end
  end
end

不过，这个测试并不能真正让我满意，因为我正在测试的是我正在使用 Faraday 进行一些 POST，但我实际上无法测试 URL、标题或正文，因为它们是通过一个块。我尝试使用法拉第测试适配器，但我也没有看到任何测试 URL、标题或正文的方法。

有没有更好的方法来编写我的 Rspec stub ？或者我是否能够以某种我无法理解的方式使用法拉第测试适配器？

谢谢!

Answer 1

我的 friend @n1kh1l 将我指向 and_yield Rspec 方法和 this SO post让我这样写我的测试:

require 'spec_helper'

describe Gist do
  context '.create' do
    it 'POSTs a new Gist to the user\'s account' do
      gist = {:public => 'true',
              :description => 'a test gist',
              :files => {'test_file.rb' => {:content => 'puts "hello world!"'}}}

      request = double
      request.should_receive(:url).with('https://api.github.com/gists')
      headers = double
      headers.should_receive(:[]=).with('Authorization', "Basic " + Base64.encode64("#{GITHUB_USERNAME}:#{GITHUB_PASSWORD}"))
      request.should_receive(:headers).and_return(headers)
      request.should_receive(:body=).with(gist.to_json)
      Faraday.should_receive(:post).and_yield(request)

      Gist.create(gist)
    end
  end
end