ruby-on-rails - 测试 'create' Controller 操作的正确方法是什么？

Question

我正在使用 Ruby on Rails 3.2.2、Rspec 2.9.0 和 RspecRails 2.9.0。我想测试 create Controller 操作，但我不知道如何使其成为“正确”/“正确”的方式。我“搭建”了模型、 Controller 、 View ……文件，因此在这些文件中我拥有由 Ruby on Rails 生成器生成的通用代码；在我的规范文件中，我有:

it "assigns @article" do
  new_article = FactoryGirl.build(:article)
  Article.should_receive(:new).and_return(new_article)
  post :create
  assigns[:article].should eq(new_article)
end

也许，(注意:上面的代码与我用来测试new Controller Action 的代码几乎相同)测试create Controller 操作将在 post :create 操作期间传递一些属性值，而不是像我上面那样继续，但我不知道如何做到这一点以及它是否是“正确”/“适当”的制作方式。

那么，测试“创建” Controller 操作的正确方法是什么？

Answer 1

我是这样做的:

describe "#create" do
  before { post :create, { "my_model"=> { "name"=>"name" } } }
  specify("should created one my_model") { change{ MyModel.count }.from(0).to(1) }
end

Aaron Sumner 最近写了这本书 Everyday Rails Testing with RSpec有一个article at his blog .他是这样描述的:

describe "POST create" do
  context "with valid attributes" do
    it "creates a new contact" do
      expect{
        post :create, contact: Factory.attributes_for(:contact)
      }.to change(Contact,:count).by(1)
    end

    it "redirects to the new contact" do
      post :create, contact: Factory.attributes_for(:contact)
      response.should redirect_to Contact.last
    end
  end

  context "with invalid attributes" do
    it "does not save the new contact" do
      expect{
        post :create, contact: Factory.attributes_for(:invalid_contact)
      }.to_not change(Contact,:count)
    end

    it "re-renders the new method" do
      post :create, contact: Factory.attributes_for(:invalid_contact)
      response.should render_template :new
    end
  end 
end