public function addDefaultWriter(atoum\writers\http $writer = null)
{
$writer = $writer ?: new atoum\writers\http($this->adapter);
$writer->setUrl(static::defaultCoverallsApiUrl)->setMethod(static::defaultCoverallsApiMethod)->setParameter(static::defaultCoverallsApiParameter)->addHeader('Content-Type', 'multipart/form-data');
return parent::addWriter($writer);
}