The purpose of ___________ testing is to verify the behavior of a component in isolation.

Unit Testing focuses on testing individual components or units of code in isolation from the rest of the software system. This allows developers to verify the correctness of each unit's behavior independently before integrating them into larger modules or systems. Integration testing, on the other hand, checks the interactions between these units once they are combined, while Regression testing ensures that changes in code or updates do not negatively impact existing functionalities. System testing evaluates the entire system's functionality in its complete environment.