使用RSpec

Question

測試邏輯我在的應用的控制器：

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

，我寫了一些初步的規範使用，以測試響應rspec的

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 

現在我要測試顯示方法的邏輯和應寫一些期望像：

it 'should be products in current cart' do 
    end 

但我不知道如何將cart.id傳遞給會話哈希

更新！我想寫什麼將與現有的購物車相關產品實例：

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 

，但得到了一個錯誤：

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)>'  

東西還是走錯了

Answer 1

，你可以在設置會話您控制器測試

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