public function that(Assertion $assertion, $message = "")
{
$this->add($assertion);
parent::that($assertion, $message);
}
/**
* Start validation and allow NULL, returns {@link AssertionChain}
*
* @param mixed $value
* @param string $defaultMessage
* @param string $defaultPropertyPath
*
* @return \Assert\AssertionChain
* @deprecated In favour of Assert::thatNullOr($value, $defaultMessage = null, $defaultPropertyPath = null)
*/
function thatNullOr($value, $defaultMessage = null, $defaultPropertyPath = null)
{
return Assert::that($value, $defaultMessage, $defaultPropertyPath)->nullOr();
}