ruby-on-rails-3 - rails/rspec 中请求规范的 stub 辅助方法

Question

我有一个名为 get_books_from_amazon 的辅助方法，它执行 API 调用并返回一组书籍。我不知道如何在我的请求规范中将它 stub 。

module BooksHelper
  def get_books_from_amazon(search_term)
    ...
  end
end

class StaticController < ApplicationController
  include BooksHelper
  def resources
    @books = get_books_from_amazon(search_term)
  end
end

我在我的规范中尝试了以下内容，但都无济于事:

# spec/requests/resource_pages_spec.rb
...
describe "Navigation" do
  it "should do such and such" do
    BooksHelper.stub!(:get_books_from_amazon).and_return(book_array)
    StaticHelper.stub!(:get_books_from_amazon).and_return(book_array)
    ApplicationHelper.stub!(:get_books_from_amazon).and_return(book_array)
    StaticController.stub!(:get_books_from_amazon).and_return(book_array[0..4])
    ApplicationController.stub!(:get_books_from_amazon).and_return(book_array[0..4])
    request.stub!(:get_books_from_amazon).and_return(book_array)
    helper.stub!(:get_books_from_amazon).and_return(book_array)
    controller.stub!(:get_books_from_amazon).and_return(book_array)
    self.stub!(:get_books_from_amazon).and_return(book_array)
    stub!(:get_books_from_amazon).and_return(book_array)

    visit resources_path
    save_and_open_page
  end

关于问题出在哪里的任何想法？

Answer 1

帮助程序通常用于清理表示“逻辑”，因此我不会在帮助程序方法中放置诸如对亚马逊 API 的调用之类的内容。

相反，将该方法移动到一个普通的旧 Ruby 类，您可以从 Controller 调用该类。
一个例子可能是:

class AmazonBookRetriever
  def get_books_from_amazon
    #code here
  end
end

然后你的 Controller 可以调用它:

def resources
  @books = AmazonBookRetriever.new.get_books_from_amazon(params[:search_term])
end

这应该会使模拟更容易。您可以在 #new 上 stub AmazonBookRetriever 以返回模拟，并验证它是否收到 get_books_from_amazon 消息。