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Front-end development is all about visualization and interacting with end-users. Accessibility Test can ensure our apps can reach as many as possible users. It will help to ensure your FrontEnd Development complies with the latest version of WCAG(Web Content Accessibility Guidelines) Standard so your app can reach most of the people out there. Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly. Mock API calls should be used to test a front-end UI with an API call.