public function setToken($token, $secret)
    {
        Argument::i()
            //argument 1 must be a string
            ->test(1, 'string')
            //argument 2 must be a string
            ->test(2, 'string');
        
        $this->requestToken = $token;
        $this->requestSecret = $secret;
        
        return $this;
    }