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

What we want to test the most out of slots is where they end up in the component. For that, we can reuse the skills we learned in the chapter _[Test Styles and Structure](https://www.educative.io/pageeditor/6019150000422912/5075745938341888)_.

Right now, most of the tests in `MessageList.test.js` will fail, so let's remove them all (or comment them out), and focus on slot testing.

# Slot Testing in Action

One thing we can do is to make sure that the Message components end up within a `ul` element with the class `list-messages`. In order to pass slots to the `MessageList` component, we can use the `slots` property of the options object of `mount` or `shallowMount` methods. So let's create a [`beforeEach` method](https://jestjs.io/docs/en/api.html#beforeeachfn-timeout) with the following code:

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

Testing Slots