What is Java Unit testing, and how do you learn it?

Unit testing is an idea to test project unit by unit, part by part.

Debugging isn't part of unit testing but part of testing step by step.

Unit tests ideally should cover all corner cases plus some random inputs for each project's unit to check whether it works properly.

JUnit allows to assure that methods return expected results and throw expected exceptions. It's is integrated with Eclipse to make the whole testing process a bit easier. Assert() methods throw an exception marking given test as 'failed' when the result of the tested method is different than expected.

JUnit can be learned any time depending on your requirements. If you are good with the concepts of the language, then you can start with it else try to get deeper understanding of the things.

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What is Java Unit testing, and how do I learn it...

What is Java Unit testing, and how do I learn it... Java Unit testing is when you create small tests to verify that small bits of your code are working as “units.” Typically you write these tests in Java itself. In each test, you might get the system into a certain state, then you interact with the system to exercise the behavior you want to test. You finally verify whether or not the system did what you expected. A primary goal is to reduce the number of defects that you integrate into the rest of the source base. You’ll find numerous tutorial articles if you search. Most people use JUnit, a simple tool that you’ll find in Eclipse or IDEA.

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