You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_mhash.rb
    path of file: ./repos/roma/test
    
    the code of the file until where you have to start completion: require 'test_helper'
require 'roma/client/rclient'
require 'roma/messaging/con_pool'
require 'roma/config'

Roma::Client::RomaClient.class_eval do
  def init_sync_routing_proc
  end
end

class MHashTest < Test::Unit::TestCase
  self.test_order = :defined
  include RomaTestUtils

  def setup
    start_roma 'config4mhash.rb'
    @rc = Roma::Client::RomaClient.new(%w(localhost_11211 localhost_11212))
  end

  def teardown
    stop_roma
    Roma::Messaging::ConPool.instance.close_all
   rescue => e
     puts "#{e} #{$ERROR_POSITION}"
  end

  def test_createhash
    con = Roma::Messaging::ConPool.instance.get_connection('localhost_11211')
    con.write("hashlist\r\n")
    ret = con.gets
    assert_equal('roma', ret.chomp)

    con.write("createhash test\r\n")
    ret = eval con.gets.chomp
    assert_equal 2, ret.length
    assert_equal 'CREATED', ret['localhost_11211']
    assert_equal 'CREATED', ret['localhost_11212']

    con.write("hashlist\r\n")
    ret = con.gets
    assert_equal('roma test', ret.chomp)

    assert_equal('STORED', @rc.set('roma', 'hname=roma'))
    assert_equal('hname=roma', @rc.get('roma'))
    @rc.default_hash_name = 'test'
    assert_nil(@rc.get('roma'))
    assert_equal('STORED', @rc.set('roma', 'hname=test'))
    assert_equal('hname=test', @rc.get('roma'))
   
    
  def test_createhash
    con = Roma::Messaging::ConPool.instance.get_connection('localhost_11211')
    con.write("hashlist\r\n")
    ret = con.gets
    assert_equal('roma', ret.chomp)

    con.write("createhash test\r\n")
    ret = eval con.gets.chomp
    assert_equal 2, ret.length
    assert_equal 'CREATED', ret['localhost_11211']
    assert_equal 'CREATED', ret['localhost_11212']

    con.write("hashlist\r\n")
    ret = con.gets
    assert_equal('roma test', ret.chomp)

    assert_equal('STORED', @rc.set('roma', 'hname=roma'))
    assert_equal('hname=roma', @rc.get('roma'))
    @rc.default_hash_name = 'test'
    assert_nil(@rc.get('roma'))
    assert_equal('STORED', @rc.set('roma', 'hname=test'))
    assert_equal('hname=test', @rc.get('roma'))
    @rc.default_hash_name = 'roma'
    assert_equal('hname=roma', @rc.get('roma'))
    assert_equal('DELETED', @rc.delete('roma'))

    @rc.default_hash_name = 'not_exist_hash'
    [:get, :delete, :incr, :decr].each do |m|
      assert_raise(RuntimeError, 'SERVER_ERROR not_exist_hash does not exists.') do
        @rc.send m, 'key'
      end
    end

    [:set, :add, :replace, :append, :prepend].each do |m|
      assert_raise(RuntimeError, 'SERVER_ERROR not_exist_hash does not exists.') do
        @rc.send m, 'key', 'value'
      end
    end

    # delete hash
    con.write("deletehash test\r\n")
    ret = eval con.gets.chomp
    assert_equal 2, ret.length
    assert_equal 'DELETED', ret['localhost_11211']
    assert_equal 'DELETED', ret['localhost_11212']

    con.close
  end