如何为简单的 PUT 更新编写 RSpec 测试? [英] How to write an RSpec test for a simple PUT update?

问题描述

我试图巩固我对 rails 和 BDD 工作流程的理解，所以我想通过创建其中一个迷你博客来从小事做起，但是使用 rspec.现在我有一个 ArticlesController 和 Article 模型，以及相关的 rspec 文件.文章很简单，只有标题:字符串和内容:文本，并且文章控制器是RESTful的——虽然文章的MCV是我亲手写的，但基本上和我用脚手架创建的一样.

I'm trying to solidify my understanding of rails and the BDD workflow, so I wanted to start small by creating one of those mini-blogs, but with rspec. Right now I have an ArticlesController and Article model, and associated rspec files. Article is very simple, has just title:string and content:text, and the ArticlesController is RESTful - although I hand wrote the MCV for Article, it's basically the same as if I used a scaffold to create it.

然而，当谈到在 rspec 中为 PUT 更新编写测试时，我真的不知道我在做什么.我正在使用 Factory Girl 创建文章对象，到目前为止我的代码如下所示:

However I don't really know what I'm doing when it comes to writing a test in rspec for the PUT update. I'm using Factory Girl to create the article object, and so far my code looks like:

#factories.rb
FactoryGirl.define do
  factory :article do
  title "a title"
  content "hello world"
end

#articles_controller_spec.rb
before(:each) do
  @article = Factory(:article)
end

describe "PUT 'update/:id'" do
  it "allows an article to be updated" do
    @attr = { :title => "new title", :content => "new content" }
    put :update, :id => @article.id, :article => @attr
    response.should be_successful
  end
end

但是我不断得到:

Failures:
1) ArticlesController PUT 'update/:id' allows an article to be updated
   Failure/Error: response.should be_successful
     expected successful? to return true, got false

我做错了什么?我是否使用了正确的工具?当我运行我的测试服务器时，New、Edit、Destroy 都按照我的预期工作，所以我猜这是我对 RSpec 理解的问题.如果我错了，请告诉我 - 谢谢！

What am I doing wrong? And am I using the right tools? When I run my test server, New, Edit, Destroy all work as I would expect them to, so I'm guessing this is a problem with my understanding of RSpec. Let me know if I'm wrong - thanks!

推荐答案

你忘记了 .reload 你的 @article，然后在 update您的响应最有可能执行重定向的操作，因此

You forgot to .reload your @article, and on update action your response most likely perform redirect, so

RSpec 2:

describe "PUT update/:id" do
  let(:attr) do 
    { :title => 'new title', :content => 'new content' }
  end

  before(:each) do
    put :update, :id => @article.id, :article => attr
    @article.reload
  end

  it { response.should redirect_to(@article) }
  it { @article.title.should eql attr[:title] }
  it { @article.content.should eql attr[:content] }
end

Rspec 3:

describe "PUT update/:id" do
  let(:attr) do 
    { :title => 'new title', :content => 'new content' }
  end

  before(:each) do
    put :update, :id => @article.id, :article => attr
    @article.reload
  end

  it { expect(response).to redirect_to(@article) }
  it { expect(@article.title).to eql attr[:title] }
  it { expect(@article.content).to eql attr[:content] }
end

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