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When scaffolding a new project with the Vue.js CLI, it offers a choice of both unit-testing and E2E-testing frameworks.
Unit-testing functionality is perfectly adequate in Cypress. My question, then: is there an advantage to using a distinct unit-testing framework if I'm already using Cypress?
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Cypress is an open source end-to-end testing framework that can help you unify web application testing. It works for all programming languages, platforms, and browsers. You can use Cypress for unit and integration testing. All tests are written in JavaScript and run in real browsers.
Vue does not have a specific testing framework of its own, but most people are using Jest as their unit testing framework of choice. It has an easy to remember API, flexible assertion mechanics and with a large community behind it, you can find many plugins and solutions to common problems.
short answers: It's very common to use Jest and Cypress in the same codebase. With component Libraries like Vue and React, the line between integration and unit tests can get a bit fuzzy.
As a result Cypress provides better, faster, and more reliable testing for anything that runs in a browser. Cypress works on any front-end framework or website. What is Jest? Painless JavaScript Unit Testing.
There is a third-party adapter made by a Cypress contributor here called cypress-vue-unit-test(along with unit-test adapters for other popular frameworks).
You should check that out and see if it meets your needs over, say, Jest
From this tutorial about unit testing vuejs, some Jest advantages over Cypress are:
Also see repo for vue-test-utils
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