Rails5.1 SystemTest with Chromium Headless mode ref: https://qiita.com/tetsuyainfra/items/b504510ea9110765e07c

application_system_test_case

require "test_helper"

class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
    chromeOptions: {
      args: %w(no-sandbox headless disable-gpu window-size=1280x800)
    }
  )

  driven_by :selenium, using: :chrome,
    options: { desired_capabilities: capabilities }

end

file0.txt

sudo apt install chromedriver
sudo apt install fonts-ipafont-gothic fonts-ipafont-mincho

file1.sh

# コアダンプ
$ chromium --screenshot http://google.com/
$ chromium --headles --screenshot http://google.com/
$ chromium --headles --disable-gpu --screenshot http://google.com/

# 結局これでおｋ
$ chromium --no-sandbox --headless --disable-gpu --screenshot http://google.com/

file2.sh

# コアダンプ
$ chromium --screenshot http://google.com/
$ chromium --headles --screenshot http://google.com/
$ chromium --headles --disable-gpu --screenshot http://google.com/

# 結局これでおｋ
$ chromium --no-sandbox --headless --disable-gpu --screenshot http://google.com/

testrun_selenium.rb

puts Rails.env

capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
  chromeOptions: {
    # binary: "/usr/bin/chromium", # 必要なし
    args: %w(no-sandbox headless disable-gpu window-size=1280x800)
  }
)

driver = Selenium::WebDriver.for :chrome,
  desired_capabilities: capabilities

driver.navigate.to "http://google.com"

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

puts driver.title

driver.quit