Testing and debugging in full-stack web development involve a systematic process of identifying and fixing errors and ensuring the reliability and functionality of web applications. Developers employ various testing methodologies, including unit testing, integration testing, and end-to-end testing, using frameworks like Jest, Mocha, or Selenium. Unit tests focus on testing individual components or functions, while integration tests verify interactions between different parts of the application, and end-to-end tests simulate user interactions across the entire application stack. Additionally, developers utilize debugging tools provided by browsers, IDEs, and testing frameworks to identify and resolve issues in both front-end and back-end code.

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