Nativescript HTTP Testing - Test Getting disconnected

I am trying to write tests using Jasmine/karma to test http get/post requests from an app we are currently building. I managed to write up a sample test, but it seems to produce disconnected Error, I have attached the test and terminal output. Really appreciate if someone could help me resolve this issue.

test.spec.ts

import "reflect-metadata";
import '/Users/Pradeepan/Documents/lawdiary/node_modules/http://ift.tt/2asjGLq';
import {
    async, inject, TestBed
} from '@angular/core/testing';

import {
    MockBackend,
    MockConnection
} from '@angular/http/testing';

import {
    HttpModule, Http, XHRBackend, Response, ResponseOptions
} from '@angular/http';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';

import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/toPromise';



import { LawyerPage } from '/Users/Pradeepan/Documents/lawdiary/app/pages/lawyer/lawyer.component';
import { LawyerService } from '/Users/Pradeepan/Documents/lawdiary/app/shared/services/lawyer.service';
import { Lawyer } from '/Users/Pradeepan/Documents/lawdiary/app/shared/entities/Lawyer';


describe("test", function () {

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [HttpModule],
            providers: [
                LawyerService,
                { provide: XHRBackend, useClass: MockBackend }
            ]
        })
            .compileComponents();


    });

    it('can instantiate service when inject service',
        inject([LawyerService], (service: LawyerService) => {
            console.log("I am Here!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
            expect(service instanceof LawyerService).toBe(true);
        }));

    it('can instantiate service with "new"', inject([Http], (http: Http) => {
        expect(http).not.toBeNull('http should be provided');
        let service = new LawyerService(http);
        expect(service instanceof LawyerService).toBe(true, 'new service should be ok');
    }));


    it('can provide the mockBackend as XHRBackend',
        inject([XHRBackend], (backend: MockBackend) => {
            expect(backend).not.toBeNull('backend should be provided');
        }));


});

karma.conf.js

 module.exports = function (config) {
  config.set({

    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',


    // frameworks to use
    // available frameworks: http://ift.tt/1ft83uu
    frameworks: ['jasmine'],


    // list of files / patterns to load in the browser
    files: [
      'app/**/*.js',
    ],


    // list of files to exclude
    exclude: [
    ],


    // preprocess matching files before serving them to the browser
    // available preprocessors: http://ift.tt/1gyw6MG
    preprocessors: {
    },


    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: http://ift.tt/1ft83KQ
    reporters: ['progress'],


    // web server port
    port: 9876,


    // enable / disable colors in the output (reporters and logs)
    colors: true,


    // level of logging
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_INFO,


    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,


    // start these browsers
    // available browser launchers: http://ift.tt/1ft83KU
    browsers: [],

    customLaunchers: {
      android: {
        base: 'NS',
        platform: 'android'
      },
      ios: {
        base: 'NS',
        platform: 'ios'
      },
      ios_simulator: {
        base: 'NS',
        platform: 'ios',
        arguments: ['--emulator']
      }
    },

    browserNoActivityTimeout: 100000,

    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: true
  })
}

Terminal Output

enter image description here