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

# Recap
So far, you've seen how you can test Vue.js components’ structure, styles, methods, computed properties, events, watchers, and more. And you've learned to do that using different techniques and methods.

But, what if we tell you that you can test most of it using snapshot testing alone?

You’ve already seen snapshots being used in chapters 1 and 2 but those chapters were more focused on explaining shallow and deep rendering, so we haven’t explained them in detail yet.

# Snapshot Testing in Details
> **Snapshot testing** is the technique of asserting by comparing two different outputs.

Think of it as something similar to what the screenshot technique used in end-to-end tests to check for regressions: the first test run takes a screenshot of a part of the screen (for instance: a button), and from that moment on, all the following runs of the same test will compare a new screenshot with the original one. If they're the same, the test passes, otherwise, there is a regression.

Snapshot testing works in the same way but instead of comparing images, it compares serializable output such as json, html or just strings.

Since Vue.js renders html, you can use snapshot testing to assert the rendered html given different states of a component.

## Rethinking in Snapshots

For this example, let's consider the following `ContactBox.vue` component:

In this lesson, we'll be learning more about Snapshots.

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

Rethinking in Snapshots

Recap

Snapshot Testing in Details