您如何期望在Rspec中使用.deliver调用邮件程序功能？

Question

我EmailTrainersAboutMissingReports.call对要求它调用的服务进行了测试TrainerMonitorMailer.missing_run_reports:

describe EmailTrainersAboutMissingReports do

  describe ('::call') do

    context 'missing two group runs' do

      let!(:group_run)    { FactoryGirl.create :group_run, started_at: 1.day.ago }
      let!(:group_run_2)  { FactoryGirl.create :group_run, started_at: 1.day.ago }

      it 'is successful' do
        expect(TrainerMonitorMailer).to receive(:missing_run_reports).with(area,
                                                [group_run, group_run_2])
        EmailTrainersAboutMissingReports.call
      end

    end

  end

end

随附服务的代码如下所示:

class EmailTrainersAboutMissingReports

  def self.call
    response = RunReportMonitor.check_all_got_published_on_time(area)
    unless response.success?
      TrainerMonitorMailer.missing_run_reports(area, response.group_runs_missing_reports).deliver
    end
  end

end

我遇到麻烦的地方是我将deliver方法链接到邮件程序.所以,当我运行测试时,我会收到:

undefined method `deliver' for nil:NilClass

我如何定义期望,以便它期望带有上述参数的missing_run_reports,但是也期望这个链接调用.deliver？

Answer 1

同时保留邮件传递.在最初的期望中返回,然后期望它收到deliver.像这样:

it 'is successful' do
  message_delivery = instance_double(ActionMailer::MessageDelivery)
  expect(TrainerMonitorMailer).to receive(:missing_run_reports).
                                  with(area, [group_run, group_run_2]).
                                  and_return(message_delivery)
  expect(message_delivery).to receive(:deliver)
  EmailTrainersAboutMissingReports.call
end