Tips for creating basic Jasmine and Karma tests for an Angular application to add an object to an array of objects

I have developed a basic Angular project for managing employee data and I'm looking to test the addProduct function. Can someone guide me on how to write a test case for this scenario? I am not using a service, just a simple push operation. Any assistance would be greatly appreciated.

public products = [{
     name:"iPhone 12",
     quantity:5
  },
  {
     name:"Samsung TV",
     quantity:1 
  }];

  addProduct(name: string,quantity:number) {

      var item = {name:name, quantity:quantity};
      this.products.push(item);

  }
javascriptangulartypescriptjasminekarma-jasmine

Answer №1

@shashank Vivek, I really appreciate your input. The code snippet below proved to be successful for me when testing the functionality of adding a product. It allowed us to verify whether the new product was successfully added to the existing array of objects.

it('should be created', () => {
  component.products.length = 2;
  component.addproduct("test",1);  
  expect(component.products.length).toBe(3);
  expect(component.products[2].name).toBe("test");
});

Answer №2

If you want to test out these functions, give this code block a try:


it('should be created', () => {
  component.products.length = 2;
  component.addproduct("test",1);  
  expect(component.products.length).toBe(3);
  expect(component.products[2].name).toBe("test");
});

Since Angular testing may be new to you, I highly suggest checking out this article that provides additional resources in the last paragraph.

This read will certainly simplify testing for you, making it easy yet efficient.

Enjoy Testing!

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Error with the Knockout framework's inability to bind to the model

I seem to be encountering an issue with binding Knockout to a model in my code. Despite the code firing and returning a JSON object, the table appears empty. Any advice or suggestions would be greatly appreciated. HTML <table style="border: double"& ...

javascriptc#jsonknockout.js

Experiencing an anonymous condition post onChange event in a file input of type file - ReactJS

When using the input type file to upload images to strapi.io, I noticed that an unnamed state is being generated in the React dev tools. Can someone explain how this happened and how to assign a name to that state? state constructor(props) { super(pro ...

javascriptreactjsimage-uploadreact-stateinput-type-file

Time taken to execute all the tests using the karma runner

We have recently transitioned to running unit tests remotely using browserstack across multiple browsers and operating systems with the help of the karma-browserstack-launcher plugin. The current output of our test run appears as follows: $ grunt unit:re ...

javascriptangularjsunit-testingkarma-runnerbrowserstack

Utilizing Vue and TypeScript - Retrieving a Variable Declared in the Data() Method within Another Method

I recently made the switch to using Vue3 with TypeScript after previously working with Vue2 and JavaScript. I am encountering an issue in my IDE where it is showing an error (even though the code itself functions correctly, but may not be entirely accurate ...

typescriptvue.js

Having trouble parsing an array from req.body using Node.js Express

I am currently facing an issue while trying to retrieve an array from a JSON request using Postman. In my Node.js application, I am able to read all values from req.body except for the array. When attempting to access the array, I only receive the first va ...

javascriptnode.jsexpress

React error: File undefined (cannot be exported)

Encountering an issue while attempting to follow a tutorial: src/components/MyApp.js Line 17:18: 'myApp' is not defined no-undef Search for the keywords to learn more about each error. This is what my myApp.js file contains: import React fr ...

javascriptreactjs

Monitor the current playing status of a YouTube video across any webpage

I am interested in developing a web extension that can identify the playback status of all YouTube videos visited by a user. Upon researching the YouTube API, I discovered that it only allows access to videos that are embedded by me. In this case, I am not ...

javascriptgoogle-chrome-extensionyoutubeyoutube-api

How can I refresh a table's data in Angular Material 2 after making edits without having to reload the entire

In my project, I utilized angular material 2 to present a table of data in the form of orders with each row representing an order. To achieve this, I created a new instance of MatTableDataSource called currentTradesData and initialized it within the ngOnIn ...

angularangular-materialangular-material2

When the data is not initialized within the ngOnInit() function, the p-dataTable does not bind properly

In the process of building a form, there is a specific dialog available for users to input data. The dialog functions within a larger form structure. Once the user finishes entering their data in the dialog and clicks on the SAVE button, the entered inform ...

angularprimeng

Error in Typescript stating that the property 'children' is not found on the imported interface of type 'IntrinsicAttributes & Props'

When I try to import an interface into my Card component and extend CardProps, a yarn build (Typescript 4.5.4) displays the following error: Type error: Type '{ children: Element[]; className: string; border: true; disabled: boolean; }' is not as ...

typescript

Comparing Angular 2's Seed and CLI: A closer look at

Exploring my options for beginning a fresh Angular 2 Project. I stumbled upon angular2-seed and angular-cli as potential tools for kickstarting the project. However, I am deliberating on which one to opt for and curious about their respective advantages a ...

angular

Collaborate and reuse Typescript code across various Node projects

Imagine we have a project structured like this: webapps ProjectA SomeClass.ts Package.json ProjectB SomeClass.ts Package.json Common LoggingClass.ts Package.json The Common "LoggingClass" needs to import a module from NPM. Let's say that ...

javascriptnode.jstypescriptnpmshared-libraries

AngularJS Expandable Table - Unlocking Limitless Possibilities

Take a look at the code snippet below: <tbody> <tr ng-repeat-start="ticket in tickets"> <td> <button ng-if="ticket.expanded" ng-click="ticket.expanded = false">-</button> <button ng-if="!t ...

javascriptangularjs

Utilizing Node.js to Retrieve a POST Request JSON and Modify its Format

Received an incoming Post request in JSON format like this: [{"username":"ali","hair_color":"brown","height":1.2},{"username":"marc","hair_color":"blue","height":1.4},{"username":"zehua","hair_color":"black","height":1.8}] Need to transform it into the f ...

javascriptnode.js

Utilizing TypeScript generic types as a key for an object

function createRecord<T extends string>(key: T): Record<T, string> { return { [key]: 'asdf' }; } Encountering an issue: The type '{ [x: string]: string; }' is not matching with the expected 'Record<T, st ...

typescriptgenerics

The function tokenNotExpired encounters an error when attempting to access the localStorage, as it

I am looking to incorporate the angular2-jwt library into my project: https://github.com/auth0/angular2-jwt However, I encountered an exception when attempting to call the tokenNotExpired function: Exception: Call to Node module failed with error: Refe ...

javascriptangularlocal-storageangular-universalangular2-jwt

In my development environment, the page does not have scroll functionality, but in the production environment, it is scrollable

Whenever I open a table or any other element with overflowing content, I encounter an issue with the scrolling bar. Even though the CSS includes overflow-y: scroll;, the scroll bar on the right remains in gray and does not allow me to scroll down when the ...

javascriptcssvue.jsfrontendvuetify.js

Click event triggering smooth scrolling

I am currently working on implementing a smooth scrolling effect using the React JavaScript library without relying on jQuery. My goal is to ensure that when a user clicks on a link, they are directed to the specific section of the page seamlessly. The f ...

javascriptreactjs

What specific portion of the code will be transformed into a virtual DOM?

As a newcomer to the virtual DOM concept, I have been pondering how it functions over the past few days. Let's envision that I have integrated a simple template engine like twig into my project, and I am utilizing vue.js as my chosen javascript frame ...

javascriptdomvue.jsvirtual-dom

Tips for navigating a dynamic viewport using scroll movement

Attempting to create a responsive page with two distinct sections at this example link including: Map View Table View Both of these views (table and map divs) need to be responsive without a hard-coded height, so the size of the map div adjusts automatic ...

javascriptjquerycss