PHPUnit_Framework_Constraint::failureDescription PHP Method

    protected function failureDescription($other)
    {
        return $this->exporter->export($other) . ' ' . $this->toString();
    }

 /**
  * Returns the description of the failure
  *
  * The beginning of failure messages is "Failed asserting that" in most
  * cases. This method should return the second part of that sentence.
  *
  * @param mixed $other Evaluated value or object.
  *
  * @return string
  */
 protected function failureDescription($other)
 {
     switch (get_class($this->constraint)) {
         case 'PHPUnit_Framework_Constraint_And':
         case 'PHPUnit_Framework_Constraint_Not':
         case 'PHPUnit_Framework_Constraint_Or':
             return 'not( ' . $this->constraint->failureDescription($other) . ' )';
         default:
             return self::negate($this->constraint->failureDescription($other));
     }
 }