Each individual component (typically a program) is tested individually in a unit test to make sure it is as error-free as feasible.
Each unit or individual component of the software application is tested as part of the unit testing process. It is the initial stage of testing software. Unit testing's purpose is to confirm each component's functionality. A unit is a single testable component that may be tested as part of the application software development process.
A UnitTest Framework is typically used by programmers to create automated test cases. The developer writes criteria into the test using an automated framework to ensure that the code is correct.
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