title: chai.request is not a function while using request js for http service unit test
body: <p>I have been using karma+requestjs + mocha + chai and sinon. i have been using chai-http module yet receives chai.request is not a function.please suggest where i am making mistake i have googled lot no luck yet. </p>
  
  <pre><code>(function() {
    var specFiles = null;
    var baseUrl = '';
    var requirejsCallback = null;
    if (typeof window != 'undefined' &amp;&amp; window.__karma__ != undefined) {
  
      baseUrl = '/base';
      requirejsCallback = window.__karma__.start;
      specFiles = [];
      for (var file in window.__karma__.files) {
        if (window.__karma__.files.hasOwnProperty(file)) {
          if (/.*\/js\/spec\/.+_spec\.js$/.test(file)) {
            specFiles.push(file);
          }
        }
      }
    }
  
    requirejs.config({
        baseUrl: baseUrl,
  
        paths: {
          'chai': './node_modules/chai/chai',
          'sinon': './node_modules/sinon/pkg/sinon',
           'chaihttp': './node_modules/chai-http/dist/chai-http',
        },
  
        deps: specFiles,
        callback: requirejsCallback
    });
  })();
  
  
  **Spect-Test.js**
  
   define(['chai', 'sinon', 'chaihttp'], function (chai, sinon, chaihttp) {
  
          var expect = chai.expect;
  
            describe('Service', function () {
  
                it('abctest', function () {
                    var abccode = { "abc": "1" };
                    var url = 'http://localhost:1234';
                    chai.request(url)
                        .post('test/testService')
                        .send(abccode )
  
                        .end(function (err, res) {
                            if (err) {
                                throw err;
                            }
                            expect(res.status).to.equal(200);
                            done();
                        });
  
               });
  
          });
      });
  </code></pre>
  
  <p><strong>Error</strong>
  TypeError: chai.request is not a function
              at Context. (</p>