Add :two_factor trait to User factory

spec/factories.rb

@@ -28,6 +28,13 @@ FactoryGirl.define do
       admin true
     end
 
+    trait :two_factor do
+      before(:create) do |user|
+        user.otp_required_for_login = true
+        user.otp_secret = User.generate_otp_secret
+      end
+    end
+
     factory :omniauth_user do
       ignore do
         extern_uid '123456'

spec/features/login_spec.rb

 require 'spec_helper'
 
 feature 'Login' do
-  let(:user) { create(:user) }
-
   context 'with two-factor authentication' do
-    before do
-      user.otp_required_for_login = true
-      user.otp_secret = User.generate_otp_secret
-      user.save!
-    end
-
     context 'with valid username/password' do
+      let(:user) { create(:user, :two_factor) }
+
       before do
         login_with(user)
         expect(page).to have_content('Two-factor Authentication')
@@ -80,6 +74,8 @@ feature 'Login' do
   end
 
   context 'without two-factor authentication' do
+    let(:user) { create(:user) }
+
     it 'allows basic login' do
       login_with(user)
       expect(current_path).to eq root_path