JUnit

The Assert class in JUnit offers static methods to test for certain circumstances. Typically, these assert statements begin with assert. You have the ability to provide the error message as well as the anticipated and actual results. A test's actual value and its expected value are compared by an assertion technique. 

JUnit can be used for functional and integration tests in addition to unit testing, which is its main use.

 In Java, there are two types of unit testing commonly used such as Manual testing and Automated testing. Based on the user requirements, the testing type can be chosen.

The testing framework JUnit is available for free. A larger community can therefore contribute to the software. As a result, developers all over the world produce better and more rapid software. Compared to other test frameworks, JUnit identifies bugs in the code early.

Automatic JUnit test execution is possible, and the tests examine their own output and deliver instant feedback. No manual searching through a report of test findings is required.

JUnit Annotations serve as metadata that you can include in your test classes or methods to offer extra information to the JUnit framework. These annotations help the JUnit framework understand how to execute the tests and provide valuable insights during the testing process.