Unable to give SOAP call in Node JS

I am referring below code for calling SOAP API using node js Below is my code

    var soapWSDL = "http://test.com?wsdl";
var params = {
    Username:’test’,
    Password:'test',
};

var callback = function (res, error, retval) {
 if (error) {
   console.log(error);
   return;
 }
 console.log(retval);
 res.send(retval);
}


 soap.createClient(soapWSDL, params,function (err, client) {
       if (err) {
         return callback(res, err, null);
       }

     client.setSecurity(new soap.BasicAuthSecurity('test','test’));

      var args = {Fields: 'test };

      client.WorksheetFetch(args, function(err, result) {
        callback(err, result);
      });

But I am getting “Request was unauthorized “error although I have given right credentials.