What is testing? SDLC Regression testing with one example Example of a Negative Test case

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Testing is the process of evaluating a system or its component(s) with the intent to find whether it satisfies the specified requirements or not.

Testing is an essential part of the Software Development Life Cycle (SDLC)
It helps to identify defects or bugs in the system
Regression testing is a type of testing that ensures that changes made to the system do not affect the existing functionality
For example, if a new feature is added to a software application, regression testing is performed to ensure that the existing features are not affected
Negative testing is a type of testing that checks how the system behaves when it is given invalid or unexpected inputs
For example, if a user enters alphabets in a field that only accepts numbers, negative testing is performed to check how the system handles this scenario

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