Dutch ZIP Code test written for PHPUnit

dutchZipcodeTest.php

<?php

  require_once 'PHPUnit/Framework.php';
   
  class ZipCodeTest extends PHPUnit_Framework_TestCase
  {

    public function testDutchZipcodes ()
    {
      foreach (array('1017VN', '1017vn', '1017 VN', '1017 vn') as $zipCode)
      {
        preg_match ( '/^(\d{4}) ?([a-z]{2})$/i', $zipCode, $result);

        $this->assertEquals('1017', $result[1]);
        $this->assertEquals('VN', strtoupper($result[2]));
      }
    }

  }