What is JUnit mainly used for?

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JUnit is mainly used for unit testing in Java applications. It is a widely-used testing framework that helps developers write and run tests to verify that individual parts of their code (called units, typically methods or classes) work correctly.


Key purposes of JUnit:

  • Automate testing: Write test cases that run automatically to check if code behaves as expected.

  • Improve code quality: Catch bugs early by testing each unit of code separately.

  • Support Test-Driven Development (TDD): Developers write tests before writing the actual code to guide development.

  • Simplify regression testing: Quickly rerun tests after changes to ensure existing functionality isn’t broken.


How it works:

  • You write test methods annotated with @Test that exercise specific functions.

  • JUnit runs these tests and reports which pass or fail.

  • You can use assertions (assertEquals, assertTrue, etc.) to check expected outcomes.

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