Test remote image url with carrierwave using rspec - ruby-on-rails

Question

I want to speed up my spec tests for my remote image url upload using the carrierwave gem. In my model I will only allow an image upload by remote url not by upload. For testing the model I use FactoryGirl with the remote_image_url field and a placeholder image.
My tests run successful but it takes a lot of time to for each test (approx. 3-4 sec) because of downloading the image. I know I can stub my tests to avoid these external http requests but I do not have an idea how to do it with factory girl. Can anyone help?
Model:
class Store < ActiveRecord::Base
mount_uploader :image, StoreUploader
attr_accessible :name, :remote_image_url
validates :remote_image_url, presence: true
end
Factory:
FactoryGirl.define do
factory :store do
name "Corner store"
remote_image_url "http://placehold.it/800x600"
end
end
RspecController:
describe Api::StoreController, type: :api do
let!(:store) { create :store }
before(:each) do
get :show, id: store.id
end
it "returns a successful response" do
expect(response).to be_success
end
it "each store has the correct fields" do
expect(json).to match("name", "image")
end
end

Answer 1

I think you can use some public image in your dropbox, but if you want to have testing isolated and able to run offline then you can look at gem "webmock".
Other option start rack web-app in parallel thread and serve image from there.
require 'sinatra/base'
require 'webrick'
module TestingPurposeServer
def self.run!(port = nil)
if port.nil?
# ask system to pick free port for us
server = TCPServer.new('127.0.0.1', 0)
port = server.addr[1]
server.close
end
thread = Thread.new do
begin
options = { :Port => port, :BindAddress => '127.0.0.1', :AccessLog => [], :Logger => WEBrick::Log.new("/dev/null"), :OutputBufferSize => 5 } #WEBrick::Log::new("/dev/null") }
server = ::WEBrick::HTTPServer.new(options)
server.mount "/", Rack::Handler::WEBrick, VtDirectServer::Server
server.start
rescue Exception => e
puts e.message
puts e.backtrace
end
end
# wait for opening port
while port_open?('127.0.0.1', port, 1)
sleep 0.01
end
sleep 0.1
port
end
def self.port_open?(ip, port, seconds = 1)
Timeout::timeout(seconds) do
begin
TCPSocket.new(ip, port).close
true
rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
false
end
end
rescue Timeout::Error
false
end
class Server < ::Sinatra::Base
# your sinatra app there
end
end
port = TestingPurposeServer.run!
local_server_url = "http://127.0.0.1:#{port}/"