【暫定版】Rails 5.1のSystemTestCaseでHeadlessモードのChromeを使ってみる

require "test_helper"

class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  driven_by :selenium, using: :chrome, screen_size: [1400, 1400]
end

require "application_system_test_case"

class UsersTest < ApplicationSystemTestCase
  setup do
    # テストデータの作成
    @user = User.create!(name: 'いとう')
  end

  test "yubinbango.js" do
    # User編集画面を開く
    visit edit_user_path(@user)

    # Nameに"いとう"が入力されていることを検証する
    assert has_field?('Name', with: 'いとう')

    # 郵便番号を入力
    fill_in 'Postal code', with: '158-0083'
    # 住所が自動入力されたことを検証する
    assert has_field?('Address', with: '東京都世田谷区奥沢')

    # 更新実行
    click_button 'Update User'

    # 正しく更新されていること（＝画面の表示が正しいこと）を検証する
    assert_text 'User was successfully updated.'
    assert_text 'いとう'
    assert_text '158-0083'
    assert_text '東京都世田谷区奥沢'
  end
end

$ chromedriver -v               
ChromeDriver 2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b)

gem 'rails', '~> 5.1.0.rc1'

group :development, :test do
  gem 'capybara', '~> 2.13.0'
  gem 'selenium-webdriver', '~> 3.3.0'
end

 require "test_helper"

 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
-  driven_by :selenium, using: :chrome, screen_size: [1400, 1400]
+  caps = Selenium::WebDriver::Remote::Capabilities.chrome("chromeOptions" => {"args" => %w(--headless)})
+  driven_by :selenium, using: :chrome, screen_size: [1400, 1400], options: { desired_capabilities: caps }
 end

$ rails test:system
Run options: --seed 22839

# Running:

E

Error:
UsersTest#test_yubinbango.js:
Selenium::WebDriver::Error::UnknownError: unknown error: cannot get automation extension
from unknown error: page could not be found: chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/_generated_background_page.html
  (Session info: headless chrome=59.0.3071.9)
  (Driver info: chromedriver=2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b),platform=Mac OS X 10.12.4 x86_64)
    test/system/users_test.rb:11:in `block in <class:UsersTest>'

Error:
UsersTest#test_yubinbango.js:
Selenium::WebDriver::Error::UnknownError: unknown error: cannot get automation extension
from unknown error: page could not be found: chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/_generated_background_page.html
  (Session info: headless chrome=59.0.3071.9)
  (Driver info: chromedriver=2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b),platform=Mac OS X 10.12.4 x86_64)



bin/rails test test/system/users_test.rb:9



Finished in 21.419511s, 0.0467 runs/s, 0.0000 assertions/s.

1 runs, 0 assertions, 0 failures, 1 errors, 0 skips

begin
  require 'action_dispatch/system_testing/driver'

  module ActionDispatch
    module SystemTesting
      class Driver
        private

        # Monkey patch for ChromeDriver 2.29
        def register
          Capybara.register_driver @name do |app|
            Capybara::Selenium::Driver.new(app, { browser: @browser }.merge(@options)).tap do |driver|
              # driver.browser.manage.window.size = Selenium::WebDriver::Dimension.new(*@screen_size)
            end
          end
        end
      end
    end
  end
rescue LoadError
  # ignore
end

$ rails test:system
Run options: --seed 58423

# Running:

Puma starting in single mode...
* Version 3.7.1 (ruby 2.4.0-p0), codename: Snowy Sagebrush
* Min threads: 0, max threads: 1
* Environment: test
* Listening on tcp://0.0.0.0:55250
Use Ctrl-C to stop
.

Finished in 1.782806s, 0.5609 runs/s, 3.3655 assertions/s.

1 runs, 6 assertions, 0 failures, 0 errors, 0 skips

require 'selenium-webdriver'

caps = Selenium::WebDriver::Remote::Capabilities.chrome("chromeOptions" => {"args" => %w(--headless)})
driver = Selenium::WebDriver.for :chrome, desired_capabilities: caps
driver.navigate.to "http://google.com"

element = driver.find_element(:name, 'q')
element.send_keys "Hello WebDriver!"
element.submit

puts driver.title

driver.quit