From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Testing error states in asynchronous React components

Testing error states in asynchronous React components

From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Testing error states in asynchronous React components

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Hello and welcome! In this session, you'll learn a crucial skill for building robust web applications, how to test for failure. Specifically, I'm going to guide you through simulating and testing error conditions in a React component that fetches data asynchronously. By the end, you'll understand how to mock a failed network request and write tests to ensure your component handles these failures gracefully, providing clear and helpful feedback to the user. This ensures your application is not only functional but also resilient. Let's start where we left off in the previous session. Now, I am going to make a crucial change to our FetchMock. I'm going to replace Promise.Resolve with Promise.Reject. This is the core technique for simulating a network failure or an API error. While promise.resolve simulates a successful response, promise.reject immediately puts the promise into a rejected state. This is exactly what happens when a fetch call fails due to a network issue or if the server…

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