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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

# Default Slots
The unnamed slot we used in the previous lesson is called the _default slot_, but we can have multiple slots by using named slots. Let's add a header to the `MessageList.vue` component:

<template>
  <div>
    <header class="list-header">
      <slot name="header">
        This is a default header
      </slot>
    </header>
    <ul class="list-messages">
      <slot></slot>
    </ul>
  </div>
</template>

MessageList.vue

By using `<slot name="header">` we're defining another slot for the header. You can see a `This is a default header` text inside the slot which is displayed as the default content.

Then, from `App.vue` we can add a header to the `MessageList` component by using the `slot="header"` attribute:

In this lesson, we'll be testing Named Slots.

Testing Named Slots

Default Slots