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A unit is known as the smallest possible component of software that can be tested.
Unit testing involves testing individual components of the software program or application.
Advantages:
Find Software Bugs Easily - saving time & money
If a future change breaks something in the code, developers will be able to identify the root of the problem right away rather than coming through an unwieldy codebase to find the issue.
the earlier a defect is detected, the lower the cost of its correction
Provides Documentation
Unit tests are a kind of living documentation of the product. Developers who want to learn about the functionality of a certain program or application can easily learn about the system by reading the documentation of each individual module.
Facilitates Change
Regression testing is a software testing practice that ensures an application still functions as expected after any code changes, updates, or improvements.
Without unit tests, 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.
Forces code to be more Reusable and Reliable. Improves quality of codebase.
Within unit tests environments, the individual modules of a product become isolated from one another and have their own area of responsibility
It helps developers to identify the smallest defects that might be present in the units before they go for integration testing.
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