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: create_package_service_spec.rb
    path of file: ./repos/gitlabhq/spec/services/packages/npm
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'spec_helper'

RSpec.describe Packages::Npm::CreatePackageService, feature_category: :package_registry do
  let(:service) { described_class.new(project, user, params) }

  subject(:execute_service) { service.execute }

  describe '#execute' do
    include ExclusiveLeaseHelpers

    let_it_be(:namespace) { create(:namespace) }
    let_it_be_with_reload(:pro
    
    def with_threads(count: 5, &block)
      return unless block

      # create a race condition - structure from https://blog.arkency.com/2015/09/testing-race-conditions/
      wait_for_it = true

      threads = Array.new(count) do |i|
        Thread.new do
          # A loop to make threads busy until we `join` them
          true while wait_for_it

          yield(i)
        end
      end

      wait_for_it = false
      threads.each(&:join)
    end