ruby-on-rails - 测试运动鞋和 Rabbitmq 的 RSpec

Question

我最近一直在使用 Rabbitmq 和 Sneakers Workers 开发消息队列。我查看了本指南https://github.com/jondot/sneakers/wiki/Testing-Your-Worker

但是我仍然不知道如何为他们开发测试。如果有任何建议，我将不胜感激。

Answer 1

建议的指南包含Sneakers::Testing存储所有已发布消息的模块。为此，您需要修补/存根方法Sneakers::Publisher#publish以将发布的消息保存到Sneakers::Testing.messages_by_queue. 然后将这些数据用于预期或以某种方式将数据提供给工人阶级。

可能在大多数情况下，您只需要内联执行规范中的延迟作业。因此可以Sneakers::Publisher#publish通过队列名称修补以获取工作类，并work使用接收到的有效负载消息调用其方法。最初设定：

# file: spec/support/sneakers_publish_inline_patch.rb

# Get list of all sneakers workers in app.
# You can just assign $sneakers_workers to your workers:
#
#     $sneakers_workers = [MyWorker1, MyWorker2, MyWorker3]
#
# Or get all classes where included Sneakers::Worker
# Note: can also load all classes with Rails.application.eager_load!
Dir[Rails.root.join('app/workers/**/*.rb')].each { |path| require path }
$sneakers_workers = ObjectSpace.each_object(Class).select { |c| c.included_modules.include? Sneakers::Worker }

# Patch method `publish` to find a worker class by queue and call its method `work`.
module Sneakers
  class Publisher
    def publish(msg, opts)
      queue = opts[:to_queue]
      worker_class = $sneakers_workers.find { |w| w.queue_name == queue }
      worker_class.new.work(msg)
    end
  end
end

或规范中一名工人的存根方法：

allow_any_instance_of(Sneakers::Publisher).to receive(:publish) do |_obj, msg, _opts|
  MyWorker.new.work(msg)
end

或者添加一个共享上下文以方便地启用内联作业执行：

# file: spec/support/shared_contexts/sneakers_publish_inline.rb

shared_context 'sneakers_publish_inline' do
  let(:sneakers_worker_classes) do
    Dir[Rails.root.join('app/workers/**/*.rb')].each { |f| require f }
    ObjectSpace.each_object(Class).select { |c| c.included_modules.include? Sneakers::Worker }
  end

  before do
    allow_any_instance_of(Sneakers::Publisher).to receive(:publish) do |_obj, msg, opts|
      queue = opts[:to_queue]
      worker_class = sneakers_worker_classes.find { |w| w.queue_name == queue }
      raise ArgumentError, "Cannot find Sneakers worker class for queue: #{queue}" unless worker_class
      worker_class.new.work(msg)
    end
  end
end

然后只需include_context 'sneakers_publish_inline'在需要执行内联作业的地方添加规范。