The Complete React Developer Course (with Hooks and Redux) - Test Spies

The video tutorial introduces the concept of spies, also known as mock functions, in testing. It explains how spies can be used to test code more thoroughly by simulating function calls and verifying their behavior. The tutorial covers creating spies using Jest, making assertions about their calls, and integrating them into test cases. It also discusses testing components with spies, focusing on form submissions and state changes. The video concludes with a challenge to test additional component behaviors using spies.

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