Googleログインのテストを追加

spec/system/omniauth_googles_spec.rb

@@ -1,9 +1,39 @@
 require 'rails_helper'
 
-RSpec.describe "OmniauthGoogles", type: :system do
+RSpec.describe 'OmniauthGoogles', type: :system do
   before do
-    driven_by(:rack_test)
+    driven_by(:selenium_chrome_headless)
+
+    OmniAuth.config.test_mode = true
+    Rails.application.env_config['devise.mapping'] = Devise.mappings[:user]
+    Rails.application.env_config['omniauth.auth']  = google_oauth2_mock
+  end
+
+  after do
+    OmniAuth.config.test_mode = false
   end
 
-  pending "add some scenarios (or delete) #{__FILE__}"
+  let 'google_oauth2_mock' do
+    OmniAuth.config.mock_auth[:google_oauth2] = OmniAuth::AuthHash.new({
+                                                                         provider: 'google_oauth2',
+                                                                         uid: '12345678910',
+                                                                         info: {
+                                                                           email: 'testing@gmail-fake.com',
+                                                                           first_name: 'taro',
+                                                                           last_name: 'test'
+                                                                         },
+                                                                         credentials: {
+                                                                           token: 'abcdefgh12345',
+                                                                           refresh_token: '12345abcdefgh',
+                                                                           expires_at: DateTime.now
+                                                                         }
+                                                                       })
+  end
+
+  scenario 'authorizes and sets user currently in database with Google OAuth' do
+    visit user_session_path
+    expect(page).to have_text 'Googleでログイン'
+    click_on 'Googleでログイン'
+    expect(page).to have_selector '#flash', text: 'Google アカウントによる認証に成功しました。'
+  end
 end