How to check if rake task was finished?

问题

This is my first experience with RoR and I using the rspec tool to test my controller. But inside the methods, I using rake tasks to create asynchronous solutions like this:

 def scan_all_urls
   system 'rake scan_all_urls &'
 end

And my rake task is this:

 task :scan_all_urls => :environment do
   crawler = Crawler.new
   urls = Url.all
   crawler.scan_urls(urls)
 end

But my issue is, at the rspec test:

it 'should scan all url' do
    params = {}
    get 'scan_all_urls', params: params, format: :json
end

How I could set to wait until the rake task finish?

回答1:

You can't really check that rake task finished. I would suggest to you write good specs for Crawler#scan_urls and maybe check in the controller that Crawler was called.

Also, test returning values in your controller spec. So the controller spec might look like this

it 'should scan all url' do
    expect(Crawler).to receive(:new).and_call_original

    params = {}
    get 'scan_all_urls', params: params, format: :json

    expect(MultiJson.load response.body).to # something
end  

来源：https://stackoverflow.com/questions/47140835/how-to-check-if-rake-task-was-finished