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Black box testing involves a structured approach to validating software functionality based on requirements without analyzing internal code. The process begins with understanding the system’s functional specifications, user stories, or requirement documents. Testers use this information to identify what needs to be tested from an end-user perspective.

The next step is designing test cases using techniques such as equivalence partitioning, boundary value analysis, and decision table testing. These methods help create effective test scenarios that cover both valid and invalid inputs while minimizing redundant test cases. Each test case should clearly define inputs, expected outputs, and execution steps.

Once test cases are prepared, testers execute them by interacting with the application and comparing actual results with expected outcomes. Any deviations are logged as defects and tracked for resolution. It is also important to test different workflows, edge cases, and error conditions to ensure comprehensive validation.

Finally, test results are analyzed, and reports are generated to provide insights into system behavior and quality. By understanding how to do black box testing, teams can perform black box testing effectively, ensuring that the application meets requirements and delivers a reliable user experience without needing access to the internal code structure.