This repo (in progress) contains all a developer needs to know about both how to setup your Salesforce project(s) to start creating Jest tests for your LWC's and how to actually create and run Jest test for your LWC's.
Housed within this repo is a wiki that goes into detail about every area of Jest testing you need to be knowledgeable on to write tests successfully.
The code in this repo is housed are examples that will hopefully allow you to get a good idea of how to write Jest tests for your own components. The code is just for example purposes only and should not be used in any production environments.
If you believe there is any information missing from this guide or that it needs more info in certain places, please submit an issue on this repo here and I'll add it ASAP!