Integration testing in React refers to the process of testing multiple components and their interactions with each other to ensure that the entire application works as intended. An integrated application includes multiple components that work together and pass data to each other. Integration testing is important in ensuring that a React application functions correctly as a whole, rather than just a collection of individual components.

When performing integration testing, test cases are designed to simulate real-world scenarios that involve multiple components interacting with each other, and assess how they interact and impact one another. This can help developers identify any issues with the application before it is released to the end-users.

In React, there are several tools available for performing integration testing. These include Jest, React Testing Library, Enzyme, and Cypress. These tools allow developers to write test cases that simulate user behavior, handle component rendering, and mimic component interactions.

Overall, integration testing is an essential part of any React development process. It helps ensure that the application works correctly as a whole, rather than just as a collection of individual components. By using the right tools and techniques for integration testing, developers can identify and resolve issues before the application is released to the end-users.