Accessibility Testing with Jest

Accessibility is a crucial aspect of web application development. We ensure that our applications are accessible to everyone, including users with disabilities. In this section, we will learn how to conduct accessibility tests using jest-axe, a powerful tool that facilitates the incorporation of accessibility rules in our tests.

What is jest-axe?

jest-axe is a library that, in combination with Jest, allows running accessibility rules (WCAG, ARIA) on web content to identify accessibility issues.

Installing jest-axe

First, install jest-axe in your project:

bash

Basic Configuration

Set up jest-axe for use with Jest by writing a setup file:

javascript

Make sure to configure this file in your Jest setup (jest.config.js or in package.json):

json

Writing Accessibility Tests

We will perform an accessibility test on a simple component to ensure it meets accessibility standards. Suppose we have the following component:

html

Let's proceed to write the accessibility tests:

javascript

Improving Accessibility

To improve accessibility, let's add some essential attributes and elements:

html

We modify the accessibility test to verify these changes:

javascript

Additional Accessibility Tests

Accessibility tests are not limited to simple forms but should also include more complex components and dynamic elements. Here are some additional examples:

1. Accessible Modals:

html

2. Accessible Modal Test:

javascript

3. Dynamic Elements:

To test dynamic components like dropdown menus or sliders:

javascript

Placeholder for image: [An illustration showing how jest-axe performs an automated DOM analysis and detects accessibility violations]

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With these tools and practices, you can start integrating accessibility tests into your development workflow. Ensuring your application is accessible not only improves the user experience but also complies with legal and ethical standards. In the next section, we will explore asynchronous testing with Jest, essential for modern applications that rely on network communications and asynchronous operations.