Why is regression testing critical when validating wca4z-generated Java against the original COBOL?
Select an answer to reveal the explanation.
Short Explanation
Regression testing matters because you re-run the original COBOL test suite against the wca4z-generated Java code to catch behavioral differences introduced by the transformation. The same inputs and expected outputs let you prove the Java counterpart behaves like the COBOL source. On mainframe exams, this concept comes up repeatedly, so lock it in.
Full Explanation
Re-running the COBOL regression suite against generated Java detects behavioral differences, since inputs and expected outputs apply to both. The other options are wrong: pre-transformation COBOL protection, COBOL compilation after copybook consolidation, and ADDI dependency-graph accuracy do not compare Java behavior to COBOL.