node.js - Test form data using Mocha for NodeJS -

i trying write mocha test nodejs sends form data , checks if response ok (200), , res.body has properties, the test fails , dont know reason. increasing timout didnt help, when use advancedrestclient chrome extension form data in payload section works perfectly! .type('form') supposed superagent syntax

var should = require('should'),     assert = require('assert'),     request = require('supertest'),     superagent = require('superagent');          describe('data', function () {              it('should return status ok (200)', function(done) {                 this.timeout(20000);                 request.post('http://xxx:3000/xxx/xxx')                     .type('form')                     .send({startdate:"2015-03-08",enddate:"2015-03-24",timelapse:"day"})                     .end(function(err, res) {                         if (err) {                             throw err;                         }                         assert.ok(res);                         assert.ok(res.body);                         assert.equal(res.status, 200);                         res.body.should.have.property('trial');                         done();             });         }); 

and error is:

typeerror: undefined not function         @ context.<anonymous> (c:\users\user\webstormprojects\statstest\test\getmostrecentdata.js:112:17)         @ test.runnable.run (c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runnable.js:233:15)         @ runner.runtest (c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:387:10)         @ c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:470:12         @ next (c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:312:14)         @ c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:322:7         @ next (c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:257:23)         @ immediate._onimmediate (c:\users\user\appdata\roaming\npm\node_modules\mocha\lib\runner.js:289:5)         @ processimmediate [as _immediatecallback] (timers.js:358:17) 

try this:

var should = require('should'),     assert = require('assert'),     request = require('supertest')('http://xxx:3000'),     superagent = require('superagent');          describe('data', function () {              it('should return status ok (200)', function(done) {                  request.post('/xxx/xxx')                     .type('form')                     .send({startdate:"2015-03-08",enddate:"2015-03-24",timelapse:"day"})                     .end(function(err, res) {                         if (err) {                             throw err;                         }                         assert.ok(res);                         assert.ok(res.body);                         assert.equal(res.status, 200);                         res.body.should.have.property('trial');                         done();             });         });