Kraken\Throwable\Error::toString PHP Метод

    public static function toString($ex)
    {
        return implode("\n", ["\t" . 'Throwable trace:', static::toThrowableString($ex), "\t" . 'Stack trace:', static::toStackString($ex)]);
    }

 /**
  *
  */
 public function testStaticApiToString_ReturnsErrorStack()
 {
     $prev = $this->createError('Previous');
     $ex = $this->createError('Error', $prev);
     $this->assertSame((string) $ex, Error::toString($ex));
 }