1. Review the important journeys.
Identify users, permissions, connected systems and known failures. Prioritize the tasks whose failure has a meaningful consequence.
Process
Make the expected result and the test limits explicit.
The first review establishes what the software needs to do and how a failure can be detected safely.
2. Prepare the test conditions.
Agree environments, fictional data, fixtures and expected results. Identify actions that could send messages, create charges or alter real records.
3. Add useful checks.
Choose automation and manual review that expose the intended behavior and failures. Keep tests understandable enough to diagnose and maintain.
4. Investigate and retest.
Capture a reproducible finding, make or coordinate the scoped repair, then repeat the failed task and relevant nearby behavior.
5. Report the release picture.
State what passed, failed, was skipped or remains untested. Keep test records distinct from genuine business activity and hand over the checks.