What is JUnit and its features ?

JUnit is a unit testing framework for the Java Programming Language.

It is one of a family of unit testing frameworks collectively known as xUnit.

JUnit promotes the idea of "first testing then coding", which emphasis on setting up the test data for a piece of code which can be tested first and then can be implemented.

This approach is like "test a little, code a little, test a little, code a little..." which increases programmer productivity and stability of program code that reduces programmer stress and the time spent on debugging.

Feature

• JUnit is an open source framework which is used for writing & running tests.
• Provides Annotation to identify the test methods.
• Provides Assertions for testing expected results.
• Provides Test runners for running tests.
• JUnit tests allow you to write code faster which increasing quality
• JUnit is elegantly simple. It is less complex & takes less time.
• JUnit tests can be run automatically and they check their own results and provide immediate feedback. There's no need to manually comb through a report of test results.
• JUnit tests can be organized into test suites containing test cases and even other test suites.
• Junit shows test progress in a bar that is green if test is going fine and it turns red when a test fails.