Piwik\SettingsPiwik::overwritePiwikUrl PHP Method

    public static function overwritePiwikUrl($currentUrl)
    {
        Option::set(self::OPTION_PIWIK_URL, $currentUrl, $autoLoad = true);
    }

 public function setUp()
 {
     parent::setUp();
     Fixture::createWebsite('2014-02-04');
     $testingEnvironment = new \Piwik\Tests\Framework\TestingEnvironmentVariables();
     $testingEnvironment->testCaseClass = null;
     $testingEnvironment->addFailingScheduledTask = false;
     $testingEnvironment->addScheduledTask = false;
     $testingEnvironment->save();
     Option::delete(self::TASKS_STARTED_OPTION_NAME);
     Option::delete(self::TASKS_FINISHED_OPTION_NAME);
     Option::delete(Timetable::TIMETABLE_OPTION_STRING);
     SettingsPiwik::overwritePiwikUrl(self::$fixture->getRootUrl() . "tests/PHPUnit/proxy");
 }