PHPUnit_Extensions_Database_Operation_Factory::TRUNCATE PHP Method

    public static function TRUNCATE($cascadeTruncates = FALSE)
    {
        $truncate = new PHPUnit_Extensions_Database_Operation_Truncate();
        $truncate->setCascade($cascadeTruncates);
        return $truncate;
    }

 /**
  * Tear down operation - Executed when the test is complete
  */
 public function tearDown()
 {
     // Tear down operation
     $this->databaseTester->setTearDownOperation(PHPUnit_Extensions_Database_Operation_Factory::TRUNCATE());
     $this->databaseTester->setDataSet($this->getDataSet());
     $this->databaseTester->onTearDown();
     // Garbage collection
     unset($this->databaseTester);
 }