Write the Test That Returns Failures

Refund sign handling can make revenue look positive or negative in the wrong direction. A data test is a query that returns rows disproving the assertion. The common trap is testing only row counts or job status because those checks are easy. They miss value-level failures that mislead users while the pipeline looks healthy. Rule Business assertion: net_payment_amount should not be negative for completed orders after refunds are applied according to policy. Write the rule in business language before SQL so the test protects a meaningful invariant. Failing rows Return order_id, customer_id, net_payment_amount, refund_amount, and payment_date where the assertion is…

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