Thread: Testing

How do you regression-test a tiny COBOL change without full UAT?

Started by Anita • user3 replies123 viewsLast activity 4 weeks ago

Post #1

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Anita

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118

Posts: 23

Joined: May 29, 2025, 12:45 PM

Posted: Jul 17, 2026, 11:53 AM

One-line fix in a calculate paragraph. Change board wants evidence. Full UAT cycle is two weeks.

What is the lightest thing that still counts as due diligence in your shop?

Post #2

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Marcus

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Joined: Apr 2, 2025, 11:27 AM

Posted: Jul 17, 2026, 2:53 PM

Capture before/after on a known input file. Same JCL, compare SYSOUT and key output datasets. Attach the diff to the ticket. Not glamorous. Auditors accept it for low-risk calcs.

Post #3

1 votes

Lisa

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Joined: Jun 20, 2025, 1:40 PM

Posted: Jul 18, 2026, 12:53 PM

We keep a "golden" small file per program in a test HLQ. If you cannot hit the paragraph with that file, your golden set is incomplete.

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