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: postcodes_io_test.rb
    path of file: ./repos/geocoder/test/unit/lookups
    
    the code of the file until where you have to start completion: # encoding: utf-8
require 'test_helpe
    
  def test_result_on_postcode_search
    results = Geocoder.search('WR26NJ')

    assert_equal 1, results.size
    assert_equal 'Worcestershire', results.first.county
    assert_equal [52.2327158260535, -2.26972239639173], results.first.coordinates
  end