mageekguy\atoum\asserters\hash::isHash PHP Method

    protected function isHash($length, $failMessage = null)
    {
        if (strlen($this->valueIsSet()->value) === $length) {
            $this->matches('/^[a-fA-F0-9]+$/', $failMessage ?: $this->_('%s does not match given pattern', $this));
        } else {
            $this->fail($failMessage ?: $this->_('%s should be a string of %d characters', $this, $length));
        }
        return $this;
    }