Integration tests for omniauth authentication

The specs use the developer omniauth strategy
  provided by omniauth itself to perform the tests.

spec/features/omniauth/omniauth_spec.rb

@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe 'Omniauth authentication' do
+  after do
+    User.delete_all
+    User.current = nil
+    OmniAuth.config.test_mode = false
+    Capybara.ignore_hidden_elements = true
+  end
+
+  it 'should sign in existing user' do
+    FactoryGirl.create(:user, force_password_change: false, identity_url: 'developer:foo@bar.com', login: 'bob', mail: 'foo@bar.com')
+    Capybara.ignore_hidden_elements = false
+
+    visit '/auth/developer'
+    fill_in('name', with: 'bob')
+    fill_in('email', with: 'foo@bar.com')
+    click_link_or_button 'Sign In'
+    expect(page).to have_link('Sign out')
+  end
+
+  it 'should fail with generic error message' do
+    # set omniauth to test mode will redirect all calls to omniauth
+    # directly to the callback and by setting the mock_auth provider
+    # to a symbol will force omniauth to fail /auth/failure
+    OmniAuth.config.test_mode = true
+    OmniAuth.config.mock_auth[:developer] = :invalid_credentials
+    visit '/auth/developer'
+    expect(page).to have_content(I18n.t(:error_external_authentication_failed))
+  end
+end