Unit testing is the process where you test the smallest functional unit of code. Software testing helps ensure code quality, and it's an integral part of software development. It's a software development best practice to write software as small, functional units then write a unit test for each code unit . You can first write unit tests as code. Then, run that test code automatically every time you make changes in the software code. This way, if a test fails, you can quickly isolate the area ... Learn how unit testing works, see examples of unit tests in popular frameworks, and learn see how to make your unit testing more effective. Unit testing is the process of testing the smallest parts of your code, like it is a method in which we verify the code's correctness by running one by one. It's a key part of software development that improves code quality by testing each unit in isolation.