An example of nodeunit + httputil + sinon

nodeunit-httputil_test.js

var sys      = require('sys'),
    nodeUnit = require('nodeunit'),
    httputil = nodeUnit.utils.httputil,
    sinon    = require('sinon'),
    logger   = require('ain-tcp');

module.exports = nodeUnit.testCase({

  setUp: function(callback) {
    router  = require('router').router; // using choreographer
    callback();
  },

  tearDown: function(callback) {
    callback();
  },

  'Test foo=bar': function(assert) {
    var mock = sinon.mock(logger);
    mock.expects('send').withArgs('event', 'info', 'yay!').once();

    httputil(router, function(server, client) {
      client.fetch('GET', '/test?foo=bar', {}, function(res) {
        assert.equal(200, res.statusCode);
        server.close();
        mock.verify();
        assert.done();
      });
    });
  }

});