Testing and debugging

Find evidence that distinguishes a repair from a passing result

A quantity update reports success while losing zero. A transaction importer returns healthy HTTP responses while storing the wrong cents or skipping a page after restart. You will use the required behavior to decide what evidence can reveal those defects.

Start with the small quantity bug, then investigate the supplied multi-module importer and review three proposed patches. The learning exercises discuss checks for application behavior. They do not change this guide’s automatic publishing workflow.