RSpec 模拟对象示例 [英] RSpec Mock Object Example

问题描述

我是模拟对象的新手，我正在尝试学习如何在 RSpec 中使用它们.有人可以发布一个示例(你好 RSpec Mock 对象世界类型示例)，或关于如何使用 RSpec 模拟对象 API 的链接(或任何其他参考)?

I am new to mock objects, and I am trying to learn how to use them in RSpec. Can someone please post an example (a hello RSpec Mock object world type example), or a link (or any other reference) on how to use the RSpec mock object API?

推荐答案

以下是我为 Rails 应用程序中的控制器测试所做的简单模拟示例:

Here's an example of a simple mock I did for a controller test in a rails application:

before(:each) do
  @page = mock_model(Page)
  @page.stub!(:path)
  @page.stub!(:find_by_id)
  @page_type = mock_model(PageType)
  @page_type.stub!(:name)
  @page.stub!(:page_type).and_return(@page_type)
end

在这种情况下，我是在嘲笑 Page &PageType 模型(对象)以及我调用的一些方法.

In this case, I'm mocking the Page & PageType models (Objects) as well as stubbing out a few of the methods I call.

这使我能够运行这样的测试:

This gives me the ability to run a tests like this:

it "should be successful" do
  Page.should_receive(:find_by_id).and_return(@page)
  get 'show', :id => 1
  response.should be_success
end

我知道这个答案更具体，但我希望它对您有所帮助.

I know this answer is more rails specific, but I hope it helps you out a little.

编辑

好的，这里有一个 hello world 示例...

Ok, so here is a hello world example...

给定以下脚本(hello.rb):

Given the following script (hello.rb):

class Hello
  def say
    "hello world"
  end
end

我们可以创建以下规范(hello_spec.rb):

We can create the following spec (hello_spec.rb):

require 'rubygems'
require 'spec'

require File.dirname(__FILE__) + '/hello.rb'

describe Hello do
  context "saying hello" do 
    before(:each) do
      @hello = mock(Hello)
      @hello.stub!(:say).and_return("hello world")
    end

    it "#say should return hello world" do
      @hello.should_receive(:say).and_return("hello world")
      answer = @hello.say
      answer.should match("hello world")
    end
  end
end

这篇关于RSpec 模拟对象示例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！