测试排队的电子邮件数量？

Question

我们可以检查enqueued_jobs.length，前提是电子邮件是唯一可能的后台作业类型。

it 'sends exactly one, particular email' do
  expect { post :create }.to(
    # First, we can check about the particular email we care about.
    have_enqueued_mail(MyMailer, :my_particular_email)
  )

  # But we also have to check that no other email was sent.
  expect(ActiveJob::Base.queue_adapter.enqueued_jobs.length).to eq(1)
end

有没有更好的方法来断言：

1. MyMailer.my_particular_email 已入队，
2. 没有其他电子邮件入队，
3. 我们不在乎是否有其他非电子邮件后台作业入队

Answer 1

# first filter MyMailer job 
my_mail_jobs = ActiveJob::Base.queue_adapter.enqueued_jobs.select { |job|
  job[:job] == SendEmailsJob &&
  job[:args][0] == "MyMailer"
}
# check only once
expect(my_mail_jobs.length).to eq(1) 
# and that send to your particular email not other email
expect(my_mail_jobs.first[:args]).to include("your particular email") 

Answer 2

我相信once 将与此匹配器一起使用。

expect {
  post :create
}.to have_enqueued_mail(MyMailer, :my_particular_email).once