example.rb

### Redirects controller:

class RedirectsController < ApplicationController
  def create
    redirect_to "http://www.google.com"
  end
end

### Routes

Rails.application.routes.draw do
  root 'pages#index'
  get 'redirect',          :to => 'redirects#create'
end

### The spec

require 'spec_helper'

describe 'RedirectsController' do

  describe "#create", sidekiq: :fake do
    before { Sidekiq::Worker.clear_all }

    describe "when called with a mmm and url" do
      it 'queues open worker' do
        visit "/redirect"
      end
    end
  end
end

### The error:
     Failure/Error: visit "/redirect"
     Capybara::InfiniteRedirectError:
       redirected more than 5 times, check for infinite redirects.
     # /home/migimunz/.rvm/gems/ruby-2.2.1@tracker/gems/capybara-2.4.4/lib/capybara/rack_test/browser.rb:40:in `process_and_follow_redirects'
     # /home/migimunz/.rvm/gems/ruby-2.2.1@tracker/gems/capybara-2.4.4/lib/capybara/rack_test/browser.rb:21:in `visit'
     # /home/migimunz/.rvm/gems/ruby-2.2.1@tracker/gems/capybara-2.4.4/lib/capybara/rack_test/driver.rb:42:in `visit'
     # /home/migimunz/.rvm/gems/ruby-2.2.1@tracker/gems/capybara-2.4.4/lib/capybara/session.rb:227:in `visit'
     # /home/migimunz/.rvm/gems/ruby-2.2.1@tracker/gems/capybara-2.4.4/lib/capybara/dsl.rb:51:in `block (2 levels) in <module:DSL>'
     # ./spec/routing/clicks_controller_spec.rb:13:in `block (4 levels) in <top (required)>'