begin config.php
<?
global $foo;
$foo='bar';
?>
end config.php

begin simpleTest.php
<?php
include 'config.php';

require_once 'PHPUnit/Framework.php';

class simpleTest extends PHPUnit_Framework_TestCase {
  public function testGlobal() {
    global $foo;
    $this->assertEquals($foo, 'bar');
  }
}
?>