RSpec:测试邮件程序只调用一次

Question

我有一个Mailer看起来像这样的东西:

class EventMailer < BaseMailer
  def event_added(user_id, event_id)
    # do stuff and email user about the event
  end
end

我EventMailer在Event课堂上这样称呼它:

class Event < Task
  def notify_by_email(user)
    EmailLog.send_once(user.id, id) do
      EventMailer.delay(queue: 'mailer').event_added(user.id, id)
    end
  end
end

哪个EmailLog是记录已发送电子邮件的类..delay由Sidekiq添加.

但是当我尝试测试#notify_by_email每个事件和用户只调用一次时,我的规范失败了:

1) Event#notify_by_email only sends once per user
     Failure/Error: expect(EventMailer).to receive(:event_added).once
       (<EventMailer (class)>).event_added(any args)
           expected: 1 time with any arguments
           received: 0 times with any arguments

规范如下:

let(:owner) { User.make! }
let(:product) { Product.make! }
let(:event) { Task.make!(user: owner, product: product) }

describe '#notify_by_email' do
  before do
    EventMailer.stub(:delay).and_return(EventMailer)
  end

  it 'only sends once per user' do
    event.notify_by_email(owner)
    event.notify_by_email(owner)

    expect(EventMailer).to receive(:event_added).once
  end
end

有关此规范失败的原因以及我如何修复它的任何见解？奇怪的是,如果我将一个puts语句放在传递给EmailLog.send_once它的块中,它只打印一次,那么规范仍会报告EventMailer.event_added未被调用.

Answer 1

您的期望应在您正在测试的代码之前声明.使用expect(...).to receive(...)基本上意味着"从现在到本规范结束之间应该收到此消息".因为期望是您的规范的最后一行,它失败了.

尝试之前移动它,你应该好好去:

it 'only sends once per user' do
  expect(EventMailer).to receive(:event_added).once

  event.notify_by_email(owner)
  event.notify_by_email(owner)
end