Skip to main content

Test Lightning Web ComponentsCall APIs from Apex

Test Lightning Web Components with Jest Framework


1. Before installing sfdx-lwc-jest install Node.js and npm.
2. Node.js : This page lists two releases of Node.js. We recommend using the “LTS” (Long Term Support) version, rather than the “Current” version.

Install Jest and Its Dependencies into Your Project
npm install @salesforce/sfdx-lwc-jest --save-dev
To Run test:
npm run test:unit

Component Folder Structure
Create a folder named __tests__ at the top level of your component’s bundle directory.
Update .forceignore with **/__tests__/**

Test File Naming Conventions:
Test files must have names that end in “.js”, and Salesforce recommend that tests end in “.test.js.”
Jest runs JavaScript files in the __tests__ directory

Example of package.json:
  "scripts": {
    "test:unit": "sfdx-lwc-jest",
    "test:unit:watch": "sfdx-lwc-jest --watch",
    "test:unit:debug": "sfdx-lwc-jest --debug",

For More Details and Examples: Click Here

Sample code to check "Hello World!" output:

import { createElement } from 'lwc';
import Hello from 'c/lwcHelloWorld';

describe('c-lwcHelloWorld', () => {
    afterEach(() => {
        // The jsdom instance is shared across test cases in a single file so reset the DOM
        while (document.body.firstChild) {

    it('displays greeting', () => {
        // Create element
        const element = createElement('c-lwcHelloWorld', {
            is: Hello

        // Verify displayed greeting
        const div = element.shadowRoot.querySelector('div');
        expect(div.textContent).toBe('Hello, World!');


Post a Comment

Popular posts from this blog

Platform Developer I Certification Maintenance (Winter '23)

 Maintain Your Platform Developer I Certification for Winter ’23 1. Field update actions have changed in API Version 54.0. Which record-triggered flows do field update actions now execute? Answer: Before-Save after After-Save 2. Which Apex class is used to determine the hostnames for the domains that Salesforce hosts for your org? Answer: System.DomainCreator 3. Which modules can be used for notifications in a Lightning web component instead of native APIs? Answer: LightningAlert, LightningConfirm, and LightningPrompt 4. What determines an org’s “shape” in Salesforce? Answer: Features, settings, edition, limits, and licenses 5. Which lightning-modal-* component is required to create a modal? Answer: Body 6. How do you call an invocable action from Apex code? Answer: Reference Invocable.Action Get Hands-On With Apex Assertions 1. Create Two Apex class: Copy and Paste below codes (A.) TestFactory @isTest public class TestFactory {    public static Account getAccount(String accountName, B

Administrator Certification Maintenance (Spring '23)

 Maintain Your Administrator Certification for Spring '23 1. What information is listed in the Details panel for recently used reports? Answer: A, B, C 2. What is used to give sales reps access to a guided process to import contacts and leads? Answer:  Sample CSV file 3. Which feature efficiently removes inactive picklist values? Answer: Bulk Delete Unused Values 4. Which type of Process Builder processes can be converted using the Migrate to Flow tool? Answer: Record-triggered Get Hands-on with Enhance Record Pages With Dynamic Forms Follow steps show in Screenshot also highlighted with Red Box:

Platform App Builder Certification Maintenance (Winter ’23)

Maintain Your Platform App Builder Certification for Winter ’23 1. What component customizes related lists directly from the Lightning App Builder? Answer:      Dynamic Related List – Single 2. Where can a debug flow test be created and saved? Answer:      Flow Builder 3. What action enables smart email auto-responses in Flow Builder? Answer:      Create Article Recommendations 4. Custom address fields improve address data accuracy for your users using what type of list? Answer: State and Country/Territory Picklists 5. What are the benefits of using Dynamic Forms on record pages? Answer:      Place fields anywhere on the page  Use Visibility Rule to show and hide fields  6. Restriction or scoping rules now allow multiple values. When should double quotes surround a value? Answer:      If a single value contains a comma  Get Hands-On With Permission Set Expiration Verify before performing this: Permission Set & Permission Set Group Assignments with Expiration Dates should be enabled