Automated tests are meticulously designed to comprehensively validate the core functionalities of the website. This includes verifying the correct rendering of data across various components, ensuring the registration and message forms adhere to validation rules and successfully submit data, testing button functionalities and user navigation interactions for consistency and responsiveness, and rigorously interfacing with the API to confirm accurate data retrieval and submission processes. These tests leverage frameworks like Selenium for UI testing and Jest for API interaction checks, ensuring a robust and reliable user experience.