sessions_controller.rb

class Users::SessionsController < Devise::SessionsController
  respond_to :xml

  before_filter :init_faye_client, if: "TEST_JABBER_INTEGRATION == true"
  after_filter  :close_faye_client, if: "TEST_JABBER_INTEGRATION == true"

  def init_faye_client
    @client = Faye::Client.new('http://localhost:9292/faye')
  end

  def close_faye_client
    @client.disconnect
  end

  def new
    add_breadcrumb "Compte", false
    add_breadcrumb "Connexion"
    super
  end

  def create
    super
    @client.publish('/xmpp/auth', 'result' => resource) if: TEST_JABBER_INTEGRATION == true
  end
end

spec_helper.rb

require 'rubygems'
require 'thin'
require 'faye'
require 'xmpp4r'

Thread.new do
  $bayeux = Faye::RackAdapter.new(mount: '/faye', timeout: 10)
  $bayeux.listen(9292)
end

RSpec.configure do |config|
  config.treat_symbols_as_metadata_keys_with_true_values = true
  config.run_all_when_everything_filtered = true
  config.filter_run :focus

  config.after(:suite) do
    $bayeux.stop
  end
end

xmpp_spec.rb

require "spec_helper"

describe "XMPP" do

  def subscribe(namespace)
    @client.subscribe(namespace) do |message|
      @message = message
    end
    sleep 1
  end

  before(:each) do
    @client = Faye::Client.new('http://localhost:9292/faye')
  end

  after(:each) do
    @client.disconnect
    @message = nil
  end

  describe "Faye pub/sub" do
    it "Faye should work" do
      subscribe "/foo"

      @client.publish('/foo', 'text' => 'Hello world') 

      sleep 0.1 until !@message.nil? # Wait a message from Faye

      expect(@message).to eq({'text' => 'Hello world'})
    end
  end

  describe "Ejabberd" do
    it "Should authenticate" do
      subscribe "/xmpp/auth"

      jid = Jabber::JID.new('foohey@localhost')
      client = Jabber::Client.new(jid)
      client.connect('127.0.0.1')
      client.auth '123456'
      
      sleep 0.1 until !@message.nil? # Wait a message from Faye

      expect(@message['result']).to_not be_empty
    end
  end

end