What is a common library used for automation testing in REST APIs?

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RestAssured stands out as a common library specifically designed for automating testing of REST APIs. It provides an intuitive syntax that makes it easy to send HTTP requests and validate responses in a way that closely resembles natural language. This library simplifies tasks such as authentication, request building, and response verification, allowing testers to create detailed assertions about the API behavior.

In addition, RestAssured seamlessly integrates with Java testing frameworks, making it a popular choice among developers looking to conduct automated tests on their web services. It supports various HTTP methods, automatically handles response serialization and deserialization, and provides rich features for validating API responses, including status codes, response times, and JSON/XML data integrity.

The other libraries mentioned serve different purposes: JUnit is primarily a testing framework for unit tests in Java, Selenium focuses on web application testing rather than REST APIs, and Mockito is used for creating mock objects in unit tests. Therefore, while valuable in their own right, they do not provide the specific capabilities needed for REST API testing like RestAssured does.