Your shipping rules are code. Test them like code.

Every rule edit in every rules app deploys instantly to production — and production is your cash register. A wrong rule doesn't throw an error; it silently shows customers the wrong options, or none at all, until your sales graph tells you two days later.

Drydock is built around the opposite workflow: draft → simulate with a full per-condition trace → save scenarios as test cases → publish only after the whole suite re-runs → roll back in one click if reality disagrees. It's unit testing for checkout logic, usable by people who've never written a test.

Test first. Undo after. Always.

Drydock runs every draft rule against a synthetic checkout — real products, any address, any customer — and shows a trace of every condition with the actual values compared. Save good scenarios as test cases and they re-run on every publish, so a rule that changes an outcome gets flagged on the publish screen instead of at your checkout. Every publish is an immutable version with a diff, and restoring a previous version is one click.