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How to use find_available_port method of Capybara Package

Best Capybara code snippet using Capybara.find_available_port

server.rb

Source:server.rb

...29      @host = deprecated_options[1] || host30      @reportable_errors = deprecated_options[2] || reportable_errors31      @port = deprecated_options[0] || port32      @port ||= Capybara::Server.ports[port_key]33      @port ||= find_available_port(host)34      @checker = Checker.new(@host, @port)35    end36    def reset_error!37      middleware.clear_error38    end39    def error40      middleware.error41    end42    def using_ssl?43      @checker.ssl?44    end45    def responsive?46      return false if @server_thread&.join(0)47      res = @checker.request { |http| http.get('/__identify__') }48      return res.body == app.object_id.to_s if res.is_a?(Net::HTTPSuccess) || res.is_a?(Net::HTTPRedirection)49    rescue SystemCallError, Net::ReadTimeout, OpenSSL::SSL::SSLError50      false51    end52    def wait_for_pending_requests53      timer = Capybara::Helpers.timer(expire_in: 60)54      while pending_requests?55        raise "Requests did not finish in 60 seconds: #{middleware.pending_requests}" if timer.expired?56        sleep 0.0157      end58    end59    def boot60      unless responsive?61        Capybara::Server.ports[port_key] = port62        @server_thread = Thread.new do63          Capybara.server.call(middleware, port, host)64        end65        timer = Capybara::Helpers.timer(expire_in: 60)66        until responsive?67          raise 'Rack application timed out during boot' if timer.expired?68          @server_thread.join(0.1)69        end70      end71      self72    end73    def base_url74      "http#{'s' if using_ssl?}://#{host}:#{port}"75    end76  private77    def middleware78      @middleware ||= Middleware.new(app, @reportable_errors, @extra_middleware)79    end80    def port_key81      Capybara.reuse_server ? app.object_id : middleware.object_id82    end83    def pending_requests?84      middleware.pending_requests?85    end86    def find_available_port(host)87      server = TCPServer.new(host, 0)88      port = server.addr[1]89      server.close90      # Workaround issue where some platforms (mac, ???) when passed a host91      # of '0.0.0.0' will return a port that is only available on one of the92      # ip addresses that resolves to, but the next binding to that port requires93      # that port to be available on all ips94      server = TCPServer.new(host, port)95      port96    rescue Errno::EADDRINUSE97      retry98    ensure99      server&.close100    end...

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