How do I use Mocha/Hippie/Tools to test API?

I'm trying to write tests for my app to test the api. I'm using swagger for specs, but whenever I try to make a request to an endpoint that works fine in my browser, I'm getting a 404.

Additionally, as you might see in the code block, I don't really know what to pass in as "app". This snippet came from the Hippie-swagger docs http://ift.tt/1R9m08k

Here is the test I'm writing:

var hippie = require('hippie-swagger');
var swagger = require('../../swagger.json');
var SwaggerParser = require('swagger-parser')
//var app = require('../../app.js')
var parser = new SwaggerParser()
var path = require('path')
var app = require('express')
var dereferencedSwagger
var swagger = require('../../swagger.json')


describe('Example of', function () {
  before(function (done) {
    // if using mocha, dereferencing can be performed prior during initialization via the delay flag:
    // http://ift.tt/1MOusSj
    parser.dereference(path.join(__dirname, '../../swagger.json'), function (err, api) {
      console.log("ERR", err);
      if (err) return done(err)
      dereferencedSwagger = api
      done()
    })
  })

  describe('correct usage', function () {
    it('works when the request matches the swagger file', function (done) {

      hippie(app, dereferencedSwagger)

      .get('/admin')
        // .pathParams({
        //   data: 1
        // })
        //.send({"communityId":"tech","code":"1"})
        .expectStatus(200)
        // 
        .end(done)
    })
  })
})