Serverspec check Hadoop conf xml file (ruby)

transfer_threads_spec.rb

require 'spec_helper'
require 'nokogiri'

describe file('/etc/hadoop/conf/hdfs-site.xml') do
	it {should be_file}
	it {should contain /dfs.datanode.max.transfer.threads/}
	it do
		doc = Nokogiri::XML(File.read("/etc/hadoop/conf/hdfs-site.xml"))
		val=doc.xpath("//property[name='dfs.datanode.max.transfer.threads']/value").text.to_i
		expect(val).to be >= 4096
	end
end