Gain insights into testing Vue.js applications using Jest. Delve into creating unit tests and build intricate tests for Vue components to ensure your app functions flawlessly.

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Front-end frameworks, in general, are exploding in popularity, and Vue.js, in particular, has become one of the most popular ones.

As front-end frameworks continue to grow in usage, the ability to incorporate testing has become an essential feature. It's simply the only scalable way to ensure your app is functioning as expected.

You can learn to test your Vue.js applications thoroughly using Jest with this interactive course.

You'll start by learning the simplest unit tests in Jest, and will gradually build up to more intricate tests of different Vue components. To give you practical front-end testing experience, you'll be running your tests on a predefined data rendering Vue.js application.

This course is essential for anyone looking to create robust and effective front-end tests for their Vue apps.

Testing Vue.js Components with Jest

So far, we’ve made tests using Jest Snapshots. In most cases, that's what we'll use, but sometimes we want to assert something more specific.

Although you can access the Vue instance via `cmp.vm`, you have a set of utilities at your disposal to make it easier. Let's see what we can do.

# The Wrapper Object

The `Wrapper` is the main object of `vue-test-utils`. It is the type returned by [mount](https://vue-test-utils.vuejs.org/api/#mount), [shallowMount](https://vue-test-utils.vuejs.org/api/#shallowmount), [find](https://vue-test-utils.vuejs.org/api/wrapper/#find) and [findAll](https://vue-test-utils.vuejs.org/api/wrapper/#findall) functions.

## `find` and `findAll`

They accept a `selector` as an argument, which can be both a CSS selector or a Vue Component.

So we can do things like:

In this lesson, we will learn about the main object of `vue-test-utils: the Wrapper Object. 

First Vue.js Component Unit Test

Testing Deeply Rendered Vue.js Components

Testing Styles and Structure

Testing Properties and Custom Events

Testing Computed Properties and Watchers

Testing Methods and Mock Dependencies

Testing Vue.js Slots

Enhance Jest configuration with Module Aliases

Snapshot Testing

Local Installation Guide

The Wrapper Object

The Wrapper Object