如何为简单的PUT更新编写RSpec测试？

Question

我试图巩固我对rails和BDD工作流程的理解，所以我想通过创建这些迷你博客中的一个来开始小型项目，但是使用rspec。现在我有一个ArticlesController和Article模型，和相关的rspec文件。文章非常简单，只有title：string和content：text，ArticlesController是RESTful - 虽然我手写了MCV for Article，但它基本上与我使用脚手架创建它相同。

然而，我并不真正知道自己在做什么，因为在rspec中为PUT更新编写测试。我使用工厂女孩以创建该项目的对象，到目前为止，我的代码如下所示：

#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 

不过，我不断收到：

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 

我在做什么错？我是否正在使用正确的工具？当我运行我的测试服务器时，新建，编辑，销毁所有工作，因为我期望他们，所以我猜这是我对RSpec的理解问题。让我知道如果我错了 - 谢谢！

Answer 1

你忘了.reload您@article，并在update行动的响应最有可能进行重定向，所以

RSpec的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的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 

Answer 2

FactoryGirl.define :article do 
    title "a title" 
    content "hello world" 
end 

before(:each) do 
    @article = Factory(:article) 
end 

it "should re-render edit template on failed update" do 
    @attr = { :title => "", :content => "new content" } 
    put :update, :id => @article.id, :article => @attr 

    flash[:notice].should be_nil 
    response.should render_template('edit') 
end 

it "should redirect to index with a notice on successful update" do 
    @attr = { :title => "new title", :content => "new content" } 
    put :update, :id => @article.id, :article => @attr 

    assigns[:article].should_not be_new_record 
    flash[:notice].should_not be_nil 
    response.should redirect_to(:action => 'index') 
end 

Answer 3

当你正在做一个PUT :update记住，你是编辑现有的模式，你需要在put打电话。只需传递您的@article并更新属性如下。

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

Answer 4

我喜欢测试更新方法的方式是确保updated_at时间比以前更长。当你这样做时，你可以改变整个实例变量的内容，并检查是否所有内容都已更新。例如：

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