Content-Type Header Not Set in `EndpointRequest.mock`

[sudobangbang]

I noticed when writing controller tests for POST and PUT that nothing was passing because all the validators failed regardless of the payload I submit. I also did not see a way to override the headers. This led me to discover the following bug. When I get time I'll submit a patch:

EndpointReqeust.mock method passes Router.prepare an empty hash

Which makes the Router.parseBody in poly/fxn set contentType to be an empty string

An example of test that fails on the built-in User model and UserController:

'use strict';

const Nodal = require('nodal');
class UserControllerTest extends Nodal.mocha.Test {

  test(expect) {

    it('assert POST returns an HTTP 200', done => {

      this.endpoint('/v1/users/').post({"email":"[e-mail]","username":"foobar","password":"foobar"},
      (status, headers, body, json) => {
        //console.log("[ JSON ]: ", json);
        expect(status).to.equal(200);
        done();
      });

    });


  }; // test()

}

module.exports = UserControllerTest;