PHPUnit_Framework_Assert::logicalNot PHP Method

    public static function logicalNot(PHPUnit_Framework_Constraint $constraint)
    {
        return new PHPUnit_Framework_Constraint_Not($constraint);
    }

 public function __construct($name, $constraint = null)
 {
     parent::__construct();
     if ($constraint === null) {
         $constraint = Assert::logicalNot(Assert::isEmpty());
     } elseif (!$constraint instanceof Constraint) {
         $constraint = Assert::equalTo($constraint);
     }
     $this->name = strtolower($name);
     $this->constraint = $constraint;
 }