Last week, one of the features requested for the new version of My Drinkaware app was to implement a Facebook login and signup.

The app was already using Devise for the Authentication, so implementing the feature using Omniauth was super easy.

If you’ve never done it before I recommend you read the Devise Omniauth wiki page and you’ll be ready in no time.

Writing the tests

Writing the tests for the Facebook login and signup is really easy as well, thanks to Omniauth test_mode.

Even though, at the moment, the client only wants to support Facebook authentication, the chances are that, in the future, Twitter or Gmail could be part of the scope.

So what I’ve ended up creating 2 helpers in my support/omniauth.rb file:

def set_omniauth(opts = {})
  default = {:provider => :facebook,
             :uuid     => "1234",
             :facebook => {
                            :email => "",
                            :gender => "Male",
                            :first_name => "foo",
                            :last_name => "bar"

  credentials = default.merge(opts)
  provider = credentials[:provider]
  user_hash = credentials[provider]

  OmniAuth.config.test_mode = true

  OmniAuth.config.mock_auth[provider] = {
    'uid' => credentials[:uuid],
    "extra" => {
    "user_hash" => {
      "email" => user_hash[:email],
      "first_name" => user_hash[:first_name],
      "last_name" => user_hash[:last_name],
      "gender" => user_hash[:gender]

def set_invalid_omniauth(opts = {})

  credentials = { :provider => :facebook,
                  :invalid  => :invalid_crendentials

  OmniAuth.config.test_mode = true
  OmniAuth.config.mock_auth[credentials[:provider]] = credentials[:invalid]


With this sweet setup, I can now have multiple defaults in my tests, which makes changes very clean:

background do
   click_link_or_button 'Sign up with Facebook'

There you go, I hope it’ll help someone some day!