用于构建嵌套属性的Rspec

Question

我的CompaniesController

中有以下代码段

class CompaniesController < ApplicationController
  def new
    @company  = Company.new
    @company.employees.build
  end

在我的Rspec中，我如何检查在build操作中调用new方法？

我试过这样的事情

expect(assigns(:company).employees).to have_received(:build)

但是我收到以下错误消息：

#<Employee::ActiveRecord_Associations_CollectionProxy:0x007fe2ca2141e8> expected to have received build, but that object is not a spy or method has not been stubbed.

我是否需要先雇员？

更新

Rspec for new action

describe "GET 'new'" do

before { get :new }

it 'assigns @domain_name' do
  expect(assigns(:domain_name)).to eq(request.host)
end

it 'assigns @company' do
  expect(assigns(:company)).to be_a_new(Company)
end

it 'renders the new template' do
  expect(response).to render_template('new')
end

端

由于

Answer 1

你可以这样做

before { expect_any_instance_of(Company.new.employees.class).to receive(:build) }

Answer 2

如何检查结果而不是检查方法调用是否发生？

it 'builds an employee on @company' do
  expect(assigns(:company).employees.length).to eq(1)
  # and/or
  expect(assigns(:company).employees.first).to be_a_new(Employee)
end