class-switch.php

<?php
if ($rc != 'local') {
  // Need SauceLabs PEAR.
  include_once 'PHPUnit/Extensions/SeleniumTestCase/SauceOnDemandTestCase.php';

  class SeleniumWrapper extends PHPUnit_Extensions_SeleniumTestCase_SauceOnDemandTestCase {

    // @TODO - Allow this list to be configured.
    public static $browsers = array(
        array(
            'name' => 'Firefox 5 on Windows',
            'os' => 'Windows 2003',
            'browser' => 'firefox',
            'browserVersion' => '5.'
        ),
        array(
            'name' => 'Internet Explorer 7 on Windows',
            'os' => 'Windows 2003',
            'browser' => 'iexplore',
            'browserVersion' => '7.'
        )
    );

    public function connect($browser) {
      $this->setHttpTimeout(90000);
    }

  }

} else {

  // Don't need SauceLabs PEAR, just use PHPUnit.
  class SeleniumWrapper extends PHPUnit_Extensions_SeleniumTestCase {

    public function connect() {
      $this->setBrowser(SELENIUM_BROWSER);
      $this->setHost('localhost');
      $this->setPort(SELENIUM_BROWSER_PORT);
    }

  }

}
?>

"class SeleniumWrapper extends PHPUnit_Extensions_SeleniumTestCase_SauceOnDemandTestCase"
"class SeleniumWrapper extends PHPUnit_Extensions_SeleniumTestCase"

this could be

"class SeleniumWrapper extends xyzParent implements iSeleniumWrapper"

Actually b/c this is PHP, I venture that class SeleniumWrapper extends $parentclass implements iSeleniumWrapper might work...