Setup JEST Testing for Salesforce LWC

Setup JEST Framework for Lightning Web Components

Before we install lwc-JEST for LWC, we need to install 2 other softwares to support.
  1. Node.js : This page may have two versions of node files. we recommend to use LTS(Long Term Support) version. Download and install it.
  2. npm:When you install Node.js, npm also installs.
Make sure you have Node and NPM installed by running simple commands to see what version of each is installed.
Node: Open command prompt and run node -v It will show verision like this: v12.14.0
NPM: Open command prompt and run npm -v It will show verision like this: 6.13.4

If Node and npm are successfully installed, then open your vs code project and follow the below steps to install lwc-jest.
Open terminal in vs code by view --> Terminal or shortcut keys for windows (control + ~ )

Run npm init command to create package.json file in the project root folder. This command will ask some details you can leave blank and hit enter to finish.

Now run following two commands one by one to install node modules.
npm install
npm install @salesforce/sfdx-lwc-jest --save-dev

Now open the package.json file created in step no 2 and add below lines in the script block.
    "test:unit": "sfdx-lwc-jest",
    "test:unit:coverage": "sfdx-lwc-jest --coverage",
    "test:unit:watch": "sfdx-lwc-jest --watch",
    "test:unit:debug": "sfdx-lwc-jest --debug"
you can alos add more commands from this list sfdx-lwc-jest commands.
That's it. If you stuck anywhere follow this JEST setup document by salesforce.
 Next post we will create simple lwc components with JEST test class.



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SWDC WORLD (Software Development Center Of The World) - is a Multi author and Multi Technology Blog: Setup JEST Testing for Salesforce LWC
Setup JEST Testing for Salesforce LWC
Setup JEST Testing for Salesforce LWC ,Setup JEST Framework for Lightning Web Components,Jest framework for lwc components to test code coverage of lightning web components.
SWDC WORLD (Software Development Center Of The World) - is a Multi author and Multi Technology Blog
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