What is JUnit and how does it help in testing Java applications?

JUnit is a popular open-source testing framework for Java applications. It allows developers to write and run repeatable automated tests to ensure the functionality of their code. This helps in identifying bugs early in the development process and ensures that changes to the codebase do not break existing functionality.

JUnit provides annotations and assertions that make it easy to set up test cases, execute tests, and verify expected outcomes. It also supports parameterized tests, which allow for the same test logic to be applied to multiple inputs.

By using JUnit, developers can create a comprehensive suite of tests that can be run automatically whenever changes are made to the code, helping to maintain the stability and reliability of the application over time.

Overall, JUnit plays a crucial role in ensuring the quality of Java applications by facilitating the implementation of a robust testing strategy.