使用 Cucumber 测试重复的 cron 作业

Question

如果他们的某个折扣即将到期，我想在上午 10 点通知我的用户。我正在使用 heroku 的每小时 cron。我在 Rails 3.0.9 和 Ruby 1.8.7 上。我在 lib/tasks/cron 中有以下 cron.rake：

# Notify users with expiring claims
puts "Notifying users with expiring claims..."
if Time.zone.now.hour == 10
  Claim.expiring_tomorrow.reject(&:redeemed?).compact.each do |claim|
    Mailer.delay.notify_customer_claim_expiration(claim)
    claim.update_attribute(:expiration_notified, true)
  end
end
puts "done."

效果很好。我的问题是我必须在黄瓜中测试三种不同的场景：

Scenario: Not receiving a expiration reminder too early
Scenario: Receiving a expiration reminder only once
Scenario: Not receiving a reminder for a redeemed claim

所以我写了以下功能：

Feature: Being reminded that a claimed discount is expiring

  Background:
    Given the hourly cron job exists

  Scenario: Not receiving a expiration reminder too early
    And the hourly cron job has fired

  Scenario: Receiving a expiration reminder only once
    And the hourly cron job has fired

  Scenario: Not receiving a reminder for a redeemed claim
    And the hourly cron job has fired

使用以下 cron.steps 步骤定义：

And /^the hourly cron job exists$/ do
  require "rake"
  @rake = Rake::Application.new
  Rake.application = @rake
  Rake.application.rake_require "lib/tasks/cron"
end

And /^the hourly cron job has fired$/ do
  Rake::Task["cron"].invoke
end

如果我单独运行每个场景，它们就会通过。如果我运行整个功能，它会在第二个（不是第一个）场景中失败：

RuntimeError: Don't know how to build task 'cron'

Rake 似乎没有持续超过第一个场景，或者需要在第二个场景运行之前重置...？

谢谢...G

Answer 1

感谢您的帖子。我最终这样做了：

And /^a cron job exists$/ do
  require "rake"
  @rake = Rake::Application.new
  Rake.application = @rake

  # remove cron.rake from list of required files to force file to be reloaded
  loaded = $".reject {|file| file == Rails.root.join("lib", "tasks", "cron.rake").to_s }

  Rake.application.rake_require("lib/tasks/cron", [Rails.root.to_s], loaded)
  Rake::Task.define_task(:environment)
end

And /^the hourly cron job has fired$/ do
  @rake["cron"].invoke
end

Answer 2

Rake::Task[].invoke 

会检查rake任务是否已经被调用，如果没有则执行。即多次调用只会执行一次任务

Rake::Task[].execute 

每次调用时都会执行该任务。