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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. Ensuring the safety and security of your web applications is critical.

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 learned how to use Shallow Rendering to test a component in isolation, preventing the component sub-tree from rendering.

But in some cases, we want to test components that behave as a group, such as a form label. Keep in mind that this only applies to [Presentational Components](https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0) since they're unaware of app state and logic. In most cases, you'd want to use Shallow Rendering for Container components.

# Testing Two Components as a Unit

In the case of the Message and MessageList components, apart from writing their own unit tests, we could want to test them both as a unit as well.



## Step 1:
Let’s start by creating `components/Message.vue`:

In this lesson, we will learn how to test two components.

Adding a Message Component