Unit testing is the act of testing individual units of source code, components or modules. It is usually done by developers or programmers. It can be done in the development environment, but it may be more efficient to test individual units outside the development environment. Unit testing can detect bugs at an early stage.Unit Testing is a great way to ensure that all your code is well-tested and bug-free before you release it to the public. With unit testing, you can boost your software's performance and decrease time spent fixing bugs.Unit Testing is a process that reviews computer software to detect, analyze, and correct errors or defects before the software's release.