Unit testing is a type of software testing that focuses on individual units or components of a software system. A unit is typically defined as the smallest testable part of a software system, such as a function, method, or class.
The goal of unit testing is to validate that each unit of the software system behaves as expected and meets its specified requirements. Unit tests are written by developers to test individual units of code, and they are typically automated, meaning that they can be run automatically and repeatedly to validate the behavior of the code.
Unit testing is important because it helps to catch defects and bugs early in the development process, before they become more difficult and expensive to fix. It also helps to ensure that individual units of code are working correctly and are integrated properly, which can help to prevent issues from appearing later in the testing and development process.
In addition, unit testing provides a safety net for future changes to the code. When changes are made to the code, unit tests can be run to verify that the changes did not introduce any new bugs or break any existing functionality. This helps to ensure that the software is working correctly, even after changes are made to the code.
Overall, unit testing is an important aspect of software development, as it helps to improve the quality, reliability, and maintainability of the code.
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