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it('not be able to get data', async(() => {
    mockBackend.connections.subscribe(
      (connection: MockConnection) => {
        connection.mockError(new Error());
      });
    service.getData().subscribe(data => data,
      error => {
      expect(error.toString()).toContain('Something went wrong. Please try again later.');
    });
  }));

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//import {MockBackend, MockConnection} from '@angular/http/testing';
//import {BaseRequestOptions, Http, Headers, ResponseOptions, Response} from '@angular/http';

it('be able to get data', () =>  {
    mockBackend.connections.subscribe(
      (connection: MockConnection) => {
        connection.mockRespond(new Response(
          new ResponseOptions({
            body: [{name : 'Jerry'},{name : 'George'},{name : 'Elaine'},{name : 'Kramer'}],
            status: 200,

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beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        AppService,
        MockBackend,
        BaseRequestOptions,
        {
          provide: Http,
          useFactory: (backend: MockBackend, defaultOptions: BaseRequestOptions) => {
            return new Http(backend, defaultOptions);

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  it('get initialized', () => expect(service).toBeDefined() );

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beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [AppService]
      })
  });

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import {Headers, Http} from '@angular/http';
import {Injectable, Inject} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';

@Injectable()
export class AppService {

AkshayRana92

class Child extends Component {

    constructor() {
        super();
    }

    handleChangeEvent() {
        this.props.onNameChange('Heisenberg')
    }

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class App extends Component {

  constructor() {
    super()
    this.state = {name: 'Say my name'}
  }

  handleName(newName) {
    this.setState({ name: newName});
  }

AkshayRana92

import React, { Component } from 'react';

class MyComponent extends Component {

    constructor() {
        super();
        this.state= {name: 'Say my name'};
        setInterval(
            () => {
                this.setState({name: 'Heisenberg'})

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class Child extends Component {
    render() {
        return (
				<h1>{this.props.name}</h1>
        );
    }
}