Rspec 测试用例 model

Question

我有 line_item.rb

class LineItem < ApplicationRecord
  belongs_to :product, optional: true
  belongs_to :cart
  belongs_to :order, optional: true


  def total_price
    product.price * quantity.to_i
  end
end

编写的测试用例

require 'rails_helper'

RSpec.describe LineItem, type: :model do
  describe '#total_price' do
    let!(:user) { create(:user) }
      it 'this is for the total function' do
        # product = build(:product)
        # lineitem = build(:line_item)     
        category = create(:category)
        product = create(:product, category_id: category.id)   
        order = create(:order, user_id: user.id, email: user.email)
        cart = create(:cart)
        line_item = create(:line_item,order_id: order.id,product_id: product.id,cart_id:cart.id)
        res = product.price * line_item.quantity.to_i
        expect(res.total_price).to eq(10)
      end
  end
  
end

我无法为 total_price 编写测试用例。 谁能告诉我谢谢

Answer 1

您应该在LineItem object 上调用total_price 。

category = create(:category)
product = create(:product,
  category_id: category.id,
  price: 2000) # in cents   
order = create(:order,
  user_id: user.id,
  email: user.email)
cart = create(:cart)
line_item = create(:line_item,
  order_id: order.id,
  product_id: product.id,
  cart_id:cart.id,
  quantity: 2)

expect(line_item.total_price).to eq(4000)

一件小事。 line_items表上的quantity字段应该是一个数字。 因此，您不需要多余的to_i调用。

def total_price
  product.price * quantity
end