Starting the browser connections result in InvalidArgumentError with Docker/Chrome headless

[Juan Gabardini]

Hi

I'm testing a Rails 3.2 app with docker  & chrome.

I could connect to the headless browser / root with Selenium/Webdriver. But it doesn't connect with Capybara.

My hypothesis is that Capybara has some problem with the args, but I had a look at it and haven't found anything 

https://github.com/teamcapybara/capybara/blob/2.18.0/lib/capybara/selenium/driver.rb

I’m getting this error (the line is a visit '...')

    Given Im a logged in user                         # features/step_definitions/web_steps.rb:21

      invalid argument

        (Session info: headless chrome=87.0.4280.88) (Selenium::WebDriver::Error::InvalidArgumentError)

      #0 0x55efaa4d2e79 <unknown>

In env.rb we have

Webdrivers::Chromedriver.required_version = '87.0.4280.88'

Capybara.default_selector = :css
Capybara.javascript_driver = :selenium
Capybara.run_server = false

Capybara.register_driver :selenium do |app|
  options = Selenium::WebDriver::Chrome::Options.new(
    args: %w[--headless --no-sandbox] # --disable-gpu --disable-dev-shm-usage --disable-setuid-sandbox --disable-web-security --disable-popup-blocking --window-size=1920,1080]
  )
  Capybara::Selenium::Driver.new(app, browser: :chrome, options: options)
end

If I try this code in env.rb, it works

require 'webdrivers'

  Webdrivers::Chromedriver.required_version = '87.0.4280.88'

  options = Selenium::WebDriver::Chrome::Options.new(

    args: %w[--headless --no-sandbox]

  )

  driver=Selenium::WebDriver.for :chrome, options: options

  driver.get 'http://www.google.com'

  p driver

Shows

#<Selenium::WebDriver::Chrome::Driver:0x76555a9ccfe3615c browser=:chrome>

In the Gemfile.lock

   ruby 2.3.8p459

    rails (3.2.22.5)

    capybara (2.18.0)

    cucumber-rails (1.4.0)

    selenium-webdriver (3.142.7)

    webdrivers (4.2.0)

Full code in https://github.com/kleer-la/eventer/tree/selenium

Thanks!
-- 

Juan