Rspec测试delayed_job

Question

我的应用程序中有一些复杂的,长时间运行的delayed_job进程.我正在使用Rspec来测试流程中使用的各个方法和类,但我还想执行许多具有不同测试数据的端到端后台作业.

我在delayed_job wiki上找不到任何关于此问题的内容,这个问题看起来很有意思但我并不真正理解这里发生了什么. 使用rSpec测试delayed_job链的最佳方法是什么？

我可以使用工厂轻松设置测试数据,然后调用启动后台处理的类.我希望测试需要很长时间才能完成.

编辑后台代码

class Singleplex
    def perform(batch_id,user)   
      batch = start_batch(batch_id,user)
        ... do lots of stuff ...
    end
    handle_asynchronously :perform, queue: :singleplex, :run_at => Proc.new { 1.second.from_now }

规格/工厂/ batches.rb

FactoryGirl.define do
  factory :batch do
    batch_type 'singleplex'
    name 'valid panel'
    status 'ready'
  end

  factory :batch_detail do
    chrom 7
    chrom_start 140435012
    chrom_end 140435012
    target_offset 150
    padding 4
    primer3_parameter_id 1
    snp_mask 't'
    status 'ready'
    batch
  end
end

然后像这样运行测试

describe Batch do  
  it 'runs Singleplex for a valid panel' do
    batch = FactoryGirl.create(:batch)
    user = User.find(1)
    status =  Singleplex.new.perform(batch.id,user)
    expect(status.should == true)
  end
end

我有两个问题需要解决:

1)如何判断测试是否等到delayed_job调用完成后再验证结果？

2)为验证结果,我需要检查多个表中的值.在Rspec中做到这一点的最佳方法是什么？

编辑

我应该添加一个delayed_job对象,所以当然状态检查失败了.这些工作通常至少需要10分钟.

1) Batch runs Singleplex for a valid panel
     Failure/Error: expect(status.should == true)
       expected: true
            got: #<Delayed::Backend::ActiveRecord::Job id: nil, priority: 0, attempts: 0, handler: "--- !ruby/object:Delayed::PerformableMethod\nobject:...", last_error: nil, run_at: nil, locked_at: nil, failed_at: nil, locked_by: nil, queue: nil, created_at: nil, updated_at: nil> (using ==)

Answer 1

有几种方法可以做到这一点.所有这些都要求您在代码中执行作业.

方法1:对作业进行排队然后告诉DelayedJob::Worker完成它的测试.

describe Batch do  
  it 'runs Singleplex for a valid panel' do
    batch = FactoryGirl.create(:batch)
    user = User.find(1)
    Singleplex.new.perform(batch.id,user)
    expect(Delayed::Worker.new.work_off).to eq [1, 0] # Returns [successes, failures]
    # Add expectations which check multiple tables to make sure the work is done
  end
end

方法2:运行相关作业并禁用排队的测试,并检查所需结果.您可以通过调用Delayed::Worker.delay_jobs = false测试配置或before块中的某个位置来延迟排队.

before(:each) do
  Delayed::Worker.delay_jobs = false
end
describe Batch do  
  it 'runs Singleplex for a valid panel' do
    batch = FactoryGirl.create(:batch)
    user = User.find(1)
    Singleplex.new.perform(batch.id,user)
    # expectations which check that the work is done
  end
end

然而,已知该方法会引起回调问题.

方法3:编写一个观察者,监视创建的任何新作业并运行它们.这样您就不必在测试中手动声明"work_off".Artsy对此有一个要点.

在其他地方进行测试以确保作业按预期排队也是一个好主意

it "queues welcome when a user is created" do
  expect(Delayed::Job.count).to eq 0
  # Create user step
  expect(Delayed::Job.count).to eq 1 # You should really be looking for the count of a specific job.
end

Answer 2

如果要围绕单个测试或一组测试运行延迟作业,可以将其添加到spec_helper.rb中

config.around(:each, :run_delayed_jobs) do |example|
  Delayed::Worker.delay_jobs = false

  example.run

  Delayed::Worker.delay_jobs = true
end

并称之为:

it 'runs the job', :run_delayed_jobs do
  # delayed job magic
end