test_close_wait.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'selenium-webdriver', '3.142.3'
end

pid = Process.pid
puts "pid: #{pid}"

puts `lsof -p #{pid} | grep TCP`

require 'selenium-webdriver'

def new_driver
  driver_options = Selenium::WebDriver::Chrome::Options.new()
  driver_capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(loggingPrefs: {performance: 'ALL'})

  Selenium::WebDriver.for :chrome,
    listener: -> (event_name, *args) { puts "heard #{event_name}, #{args}" },
    options: driver_options,
    desired_capabilities: driver_capabilities
end

10.times { new_driver.quit }

puts 'Pre GC'
puts `lsof -p #{pid} | grep TCP`

GC.start

puts 'After GC'
puts `lsof -p #{pid} | grep TCP`

puts "done"