What is Unit Testing?
UNIT TESTING is a type of software testing where individual units or components of a software are tested. The purpose is to validate that each unit of the software code performs as expected. Unit Testing is done during the development (coding phase) of an application by the developers. Unit Tests isolate a section of code and verify its correctness. A unit may be an individual function, method, procedure, module, or object as long it’s independent.
In SDLC, Unit testing is first level of testing done before integration testing. Unit testing is a WhiteBox testing technique that is usually performed by the developer. But now a days QA developer also doing unit testing.
Advantages of Unit Testing?
This is the main benefit of unit testing. When you add more features to any software, you might need to make changes to the old design and code, and this can be expensive as well as risky. If you use the unit testing methodology, then this can save a lot of time and can make the whole process much faster and easier.
Quality of Code:
Unit testing significantly improves code quality. It helps developers to identify the smallest defects that might be present in the units before they go for integration testing.
Find Software Bugs Easily:
Unit testing helps identify all kinds of issues with the software at a very early stage. Software developers can then work on those issues first before progressing any further. The main advantage of this is when the issues are resolved at an early stage, no other part of the software is impacted. This leads to increased efficiency, reduced downtime, and reduced costs that would otherwise arise as a result of the whole design process stalling.
Refactoring the code or updating the system library becomes much easier when you test each component of the software individually. If there are any problems, they are detected early on and making changes to the system thus becomes much easier. The accuracy of each unit is verified before it moves on to the next phase. This means that the unit is proven to be in proper working order before it’s integrated with other modules.
Any problems or bugs in the system are identified in the early stages through unit testing, and because of that the cost of bug fixes is significantly reduced. If these bugs are discovered later, then it will be much more expensive to fix them.
How Unit Test works with Example
Follow our Youtube link to see and understand how Unit Test works: https://youtu.be/Q3UtPmJXiDI