In which of the following testing methods is the test engineer equipped with the knowledge of system and designs test cases or test data based on system knowledge?

Integration testing focuses on verifying the interfaces and interactions between different modules or components of a system, not on the level of internal knowledge used to design test cases.

Regression testing involves re-executing existing test cases after changes to ensure that new code has not introduced new bugs or broken existing functionality.

Whitebox testing requires full knowledge of the system's internal code structure and implementation details, which is more extensive than 'knowledge of system' typically implies in the context of distinguishing from graybox.

In graybox testing, the test engineer has partial knowledge of the system's internal workings, such as architecture diagrams, design documents, or database schemas. This allows them to design targeted test cases that explore internal paths and states more effectively than blackbox testing, while not requiring the exhaustive knowledge of whitebox testing.