How to Setup Jest for LWC Testing

Install/Setup guide for Jest:

1. Download nodejs here: Node JS Install or use chocolately and nodist if you know what you're doing (this approach is a bit better imo): NodeJS Nodist Install Instructions

2. Install Jest CLI via the CLI using the command: npm install -g jest-cli (or npm install --save-dev jest-cli for a local project install)

3. You may need to change your execution policy since jest doesn't register as a known Windows Package currently. Open powershell as an admin and enter the following command: Set-ExecutionPolicy Unrestricted a) When prompted, type the value A and then hit enter

4. Create a top level folder in your project called __tests__

5. Create tests in that folder and name them [fileYouAreTesting].test.js

6. Use the cli command jest --watch to have jest automatically run tests when they get updated