Angular 2: Testing Firebase Add Functionality with Unit Tests

Question

Angular 2: Testing Firebase Add Functionality with Unit Tests

Is there a way to perform a basic unit test in Angular 2 for testing a simple firebase adding item feature?

I've opted for typescript over standard JavaScript in my code.

This is the piece of code I want to test:

 export class AppComponent {
     ref: Firebase;
     refUsers: Firebase;
     refProfiles: Firebase;

     constructor(){
         this.ref = new Firebase("https://markng2.firebaseio.com");
         this.refUsers = new Firebase("https://markng2.firebaseio.com/users");
         this.refProfiles = new Firebase("https://markng2.firebaseio.com/profiles");    
     }

     public addUser(newUser: Object): void{     
         this.refUsers.push(newUser, ()=>{

         });
     }
 }

Here's what my current test looks like:

 import {it, iit, describe, expect, inject, injectAsync, beforeEachProviders, fakeAsync, tick } from 'angular2/testing';
 import { AppComponent } from '../app/app';

 describe('AppComponent', () => {

     it('saves an item to Firebase', () => {
         let refUsers = new Firebase('');

         let service = new AppComponent();

         spyOn(service.refUsers, 'push');
         service.addUser({ item: true });

         expect(service.refUsers.push).toHaveBeenCalled();
     })

 });

Upon executing the test, here's the error message I'm receiving:

https://i.sstatic.net/Velft.png

javascript unit-testing typescript firebase angular

Answer 1

Answer №1

Starting Testing in Three Easy Steps!

Prepare your testing environment. Check out the comprehensive guide in the Angular 2 documentation.
Code away!
Create tests for your code.

For instance, let's say you've developed a class named DataService:

/// <reference path="typings/firebase/firebase.d.ts" />

export class DataService {
    ref: Firebase;
    constructor(theRef: Firebase) {
        this.ref = theRef;
    }
    add(object: any) {
        this.ref.push(object);
    }
}

To test it, import the DataService and utilize Jasmine methods to verify the functionality of the add method.

import {DataService} from './data-service';

describe('DataService', () => {

    it('stores an item in Firebase', () => {
        let ref = new Firebase('');
        let service = new DataService(ref);
        // set up a spy to track if push is invoked
        spyOn(service.ref, 'push');
        service.add({ item: true });
        // ensure that push was called
        expect(service.ref.push).toHaveBeenCalled();
    })

});

Testing Firebase methods involves spying on them. The focus is on ensuring that your code interacts correctly with Firebase, rather than validating Firebase itself.

The challenge lies in using the entire Firebase SDK in unit testing. It's preferable to utilize a mocked library, allowing you to create mocks for specific functionalities required from the Firebase SDK.

Answer 2

Starting Testing in Three Easy Steps!

Prepare your testing environment. Check out the comprehensive guide in the Angular 2 documentation.
Code away!
Create tests for your code.

For instance, let's say you've developed a class named DataService:

/// <reference path="typings/firebase/firebase.d.ts" />

export class DataService {
    ref: Firebase;
    constructor(theRef: Firebase) {
        this.ref = theRef;
    }
    add(object: any) {
        this.ref.push(object);
    }
}

To test it, import the DataService and utilize Jasmine methods to verify the functionality of the add method.

import {DataService} from './data-service';

describe('DataService', () => {

    it('stores an item in Firebase', () => {
        let ref = new Firebase('');
        let service = new DataService(ref);
        // set up a spy to track if push is invoked
        spyOn(service.ref, 'push');
        service.add({ item: true });
        // ensure that push was called
        expect(service.ref.push).toHaveBeenCalled();
    })

});

Testing Firebase methods involves spying on them. The focus is on ensuring that your code interacts correctly with Firebase, rather than validating Firebase itself.

The challenge lies in using the entire Firebase SDK in unit testing. It's preferable to utilize a mocked library, allowing you to create mocks for specific functionalities required from the Firebase SDK.

Angular 2: Testing Firebase Add Functionality with Unit Tests

Answer №1

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