# Testing a content-driven web app frontend

Testing is crucial to ensuring the functionality, quality, accessibility,
security, and performance of your content driven web application. Testing lets
you assess the user experience and determine if further development is
necessary. Your web application should meet quality standards and perform as
expected.

This provides basic testing guidance for you to consider to make your web
application accessible and user-friendly.

| Components ||
|---|---|
| Color contrast | Ensures that the contrast ratio is optimized for readability. Checks need to be done for various types of color blindness and user defined high contrast forced colors. |
| Typography | Determines if the application accommodates different devices and settings. By using relative font size and non linear scaling the typography can still be usable on the max size. |
| Images | Ensures that the images are high quality and can load quickly. It is important to check for correct fallbacks with no network and optimized assets for higher resolutions. |
| Navigation | Ensures that the navigation is clear and usable by mouse, touch and keyboard navigation. Checking the history api ensures the back and forward navigation is also preserved correctly. |
| Search | Check for low latency in response times to queries in the URL query parameters and search field. |
| Form | Ensures that all forms are user-friendly to complete and submit. If overriding the default form submission the correct events need to be listened to and checked for proper form reset and protection against malicious user input. |
| Performance | Ensures that the application is efficient and responsive, with fast load times. This should be an important part of regression testing too. |

There are [many tools](https://www.w3.org/WAI/ER/tools/) you can
use to check web accessibility. It is important to use multiple methods in order
to cover the range of accessibility components. Be sure to check for ARIA
labels, a11y on DOM elements, keyboard navigation, and screen reader use.

Front end testing frameworks, such as [Jest](https://jestjs.io/),
[Vitest](https://vitest.dev/),
[Cypress](https://www.cypress.io/),
[Mocha](https://mochajs.org/) or
[Jasmine](https://jasmine.github.io/) help you write tests
efficiently and support behavior-driven and test-driven development. With
integrations into CI/CD pipelines you can also automate your tests and help
prevent regression bugs in commits.

Runner frameworks, such as [Web Test
Runner](https://modern-web.dev/docs/test-runner/overview/),
[Playwright](https://playwright.dev/), [Web
Driver](https://webdriver.io/) or the [Test Runner in
Node.js](https://nodejs.org/api/test.html) let you execute these
tests efficiently and support testing across multiple environments and
platforms. This is not an exhaustive list and depending on the framework you are
using there could be testing built-in.