Which type of testing is most appropriate for ensuring that new features do not disrupt existing functionalities in an inventory system?

• A. Unit Testing
• B. Integration Testing
• C. Regression Testing
• D. User Acceptance Testing

Answer: (C)

Regression Testing is specifically designed to ensure that new features or changes made to the software do not adversely affect the existing functionalities. This type of testing is particularly important in systems like an inventory system, where introducing new features must not disrupt the already functioning parts of the application.

When regression testing is conducted, previous test cases are re-executed to determine if the new code has impacted any of the previously tested functionality. This encompasses not only the new features but also validates that the overall system remains stable after updates.

In contrast, unit testing focuses on individual components and their functionality, which does not assess the interaction of those units as a whole. Integration testing evaluates the interaction between different system modules, but it doesn’t specifically target the validation of existing functionalities after changes. User Acceptance Testing is aimed at confirming the system meets business requirements and is ready for users, rather than ensuring that new features do not interfere with existing functions.

Thus, regression testing is the most appropriate choice for this scenario, as it ensures that newly added features integrate seamlessly without affecting established functionalities within the inventory system.