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: lookup_hash_test.rb
    path of file: ./repos/workarea/core/test/lib/workarea/ext/mongoid
    
    the code of the file until where you have to start completion: require 'test_helper'

module Mongoid
  class LookupHashTest < Workarea::TestCase
    class BsonIdModel
      include Mongoid::Document
    end

    class IntegerModel
      include Mongoid::Document
      field :_id, type: Integer
    end

    class Strin
    
    def test_integers
      one = IntegerModel.create!(id: 1)
      two = IntegerModel.create!(id: 2)

      results = IntegerModel.to_lookup_hash
      assert_equal(2, results.size)
      assert_equal(results[1], one)
      assert_equal(results[2], two)

      results = IntegerModel.where(:id.gt => 1).to_lookup_hash
      assert_equal(1, results.size)
      assert_equal(results[2], two)

      results = IntegerModel.where(id: 1).to_lookup_hash
      assert_equal(1, results.size)
      assert_equal(results[1], one)
      assert_equal(results['1'], one)
    end