Rspec for Detecting devises - ruby-on-rails

Question

This is my task
1) Create a new route localhost:3000/device
2) Consider if this url is hit from the mobile phones or desktop browsers, then
3) Track the system/device (iOS, android, web) from which the URL is hit
4) Based on the device from which the request has come, we need to redirect to some other URL (e.g., iOS ——> “iOS app store”, android ——> “Android play store”, web ——> “google page”)
5) Find what are the different approaches that are available to track the system from which the request has come and what would be the best one to implement and why?
Here I found a solution, but in rspec it causes error.
This is my route
get :devise, to: 'topics#devise'
And this is my controller
class TopicsController < ApplicationController
def devise
if request.env['HTTP_USER_AGENT'].downcase.match(/mac/i)
redirect_to 'https://itunes.apple.com/us/app/apple-store/id375380948?mt=8'
elsif request.env['HTTP_USER_AGENT'].downcase.match(/windows/i)
redirect_to 'https://www.microsoft.com/en-in/store/apps/windows'
elsif request.env['HTTP_USER_AGENT'].downcase.match(/android/i)
redirect_to 'https://play.google.com/store?hl=en'
else
redirect_to root_path
end
end
end
When I hit url lvh.me:3000/devise it redirects to the respective app store.
This is my controller spec
context 'devise' do
it 'should detect the device' do
get :devise
response.should redirect_to '/https://www.microsoft.com/en-in/store/apps/windows'
end
end
and this caused the error:
Expected response to be a redirect to http://test.host/https://www.microsoft.com/en-in/store/apps/windows but was a redirect to http://test.host/.
Expected "http://test.host/https://www.microsoft.com/en-in/store/apps/windows" to be === "http://test.host/".
If I did it in a wrong way, tell some suggestion for doing rspec

Answer 1

If your rails version is not too ancient in controller you can use request.user_agent (it will look into env anyway, but this makes code cleaner)
Browsers pass user agent in header User-agent (which in turn ends up in rack env), so you need to simulate this in your tests.
For testing this I'd recommend using request specs instead of controller ones (which are deprecated in rails 5):
RSpec.describe 'Topics...', type: :request do
it "redirects for ios" do
get '/your/topcis/path/here', headers: { 'HTTP_USER_AGENT' => 'iPhone' }
expect(response).to redirect_to(/\.apple\.com/)
end
end
(above uses rails 5, for older rails headers will be just hash, not a keyword argument)
Also you can write your method with case statement:
def devise
redirect_to case request.user_agent.downcase
when /mac/i then 'https://itunes.apple.com/us/app/apple-store/id375380948?mt=8'
when /windows/i then 'https://www.microsoft.com/en-in/store/apps/windows'
when /android/i then 'https://play.google.com/store?hl=en'
else
root_path
end
end