使用 rspec 测试逻辑

Question

我在应用程序中有一个控制器：

class CartsController < ApplicationController
  def show
    @cart = Cart.find(session[:cart_id])
    @products = @cart.products
  end
end

我写了一些初始规范来使用 rspec 测试响应

RSpec.describe CartsController, type: :controller do                       
  describe 'GET #show' do
    before do
      get :show
    end
    it { expect(response.status).to eq(200) }
    it { expect(response.headers["Content-Type"]).to eql("text/html; charset=utf-8")}
    it { is_expected.to render_template :show }
  end
end

现在我要测试 show 方法的逻辑，应该写一些期望，比如：

  it 'should be products in current cart' do 
  end

但我不知道如何将 cart.id 传递给会话哈希

更新！我正在尝试编写与当前购物车相关联的产品实例：

    let(:products_list){FactoryGirl.build_list(:product, cart_id: session[:cart_id])}
    let(:cart){FactoryGirl.build(:cart)}
    ...
    it 'should be products in current cart' do
      session[:cart_id] = cart.id
      expect(assigns(:products)).to eq([products_list])
    end   

但出现错误：

    CartsController GET #show should be products in current cart
 Failure/Error: let(:cart){FactoryGirl.build(:cart)}

 ArgumentError:
   Trait not registered: products
 # ./spec/controllers/carts_controller_spec.rb:6:in `block (3 levels) in <top (required)>'
 # ./spec/controllers/carts_controller_spec.rb:15:in `block (3 levels) in <top (required)>'      

还是有问题

Answer 1

您可以在控制器测试中设置会话

it 'should be products in current cart' do 
   session[:cart_id] = 10
   get :show
end