Rails 5.1 System Test driven by headless chrome.

system_test_driven_by_headless_chrome.rb

    driven_by(
      :selenium,
      using: :chrome,
      screen_size: [1400, 900],
      options: {
        desired_capabilities: {
          chromeOptions: {
            args: %w[headless disable-gpu],
            prefs: {
              'modifyheaders.headers.name' => 'Accept-Language',
              'modifyheaders.headers.value' => 'ja,en',
            },
          },
        },
      }
    )