Which type of test helps identify how a system behaves under unusual or incorrect usage scenarios?

The type of test that identifies how a system behaves under unusual or incorrect usage scenarios is misuse case testing. This form of testing focuses explicitly on the ways a system can be misused or attacked, enabling security professionals to understand potential vulnerabilities that could be exploited through incorrect inputs or inappropriate actions.

By defining misuse cases, testers can simulate various scenarios where users or systems interact with the application in ways that deviate from expected behavior. This testing helps reveal weaknesses that may not be apparent during regular operation, allowing security teams to strengthen the system's resilience against such misuse.

In contrast, normal use testing examines how a system operates under expected conditions, stress testing evaluates performance under high load, and integration testing checks the interaction between different system components. These approaches do not specifically address anomalous behavior triggered by misuse, making them less relevant for identifying how a system performs in unusual scenarios.