Writing Tests for React/Next.js API using axios

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The Problem

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This typically indicates that the data structure being passed to your component is not what it expects. Let’s delve into how to correct this.

Understanding Your Code Structure

Before we jump into solutions, let’s review the structure of the code you're working with.

This function fetches trending movies from an external API using axios.

This component utilizes getServerSideProps to fetch data and render a Movie Carousel based on the results.

This is where you'll write tests to check if the component renders correctly.

Common Issues and Their Solutions

1. Mocking axios Correctly

To begin with, you should declare a mock for axios at the top of your test file. This step ensures that the mock is processed before the imports.

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2. Correcting Your Mock Response

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3. Manually Invoking getServerSideProps

Remember that the function getServerSideProps does not execute automatically in your tests. You can manually pass the expected props to your component instead of mocking axios. Here’s how you can adjust your test:

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Conclusion

Final Tips

Always validate the data structure expected by your component.

Don't hesitate to use simple objects for testing props in your components.

With these practices in hand, you can confidently approach your testing duties. Happy coding!