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Front-end development has evolved beyond simple HTML and CSS. Today, frameworks like React and Angular power complex, interactive applications. Ensuring these apps work reliably is crucial, and this is where explain TDD—Test-Driven Development—comes in. TDD is a methodology where tests are written before the actual code, guiding development and ensuring correctness from the start.

For React, TDD can be applied using tools like Jest and React Testing Library. Developers first write tests for components or functions, specifying expected behavior. For instance, a simple form component might have tests that validate input handling, button clicks, and conditional rendering. Once the tests are defined, developers implement the component, ensuring all tests pass. This approach reduces guesswork and helps catch regressions early, making refactoring safer.

In Angular, TDD is typically implemented using Jasmine and Karma. You write unit tests for services, directives, and components before coding the actual logic. For example, testing an Angular service that fetches data from an API ensures it correctly handles success and error responses. Writing tests first guarantees that the service behaves as expected, and future changes don’t break functionality unexpectedly.

An added advantage comes when combining TDD with automated testing platforms like Keploy. Keploy captures real API interactions and automatically generates test cases and mocks, making it easier to maintain thorough front-end tests without manually writing every scenario. This integration ensures your React or Angular application remains reliable even as it grows in complexity.

In summary, TDD in front-end development promotes clean, maintainable, and reliable code. By explaining TDD through concrete examples in React and Angular, developers can adopt a mindset that prioritizes testing from the very beginning. Coupled with tools like Keploy, this methodology not only speeds up development but also ensures high-quality, resilient applications.