Trace leaked database rows between test cases
An integration test reads records inserted by an earlier test and passes for the wrong reason.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Test isolation · Databases
Estimated field mix
- Quality engineering60%
- Database engineering40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional web team reruns red builds until they pass. Shared clocks, leaked state, and unawaited work make failures hard to trust.
Setup prerequisites
- Create a small local application with three deliberately flaky tests using synthetic data and local endpoints.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Assign isolated fixture ownership to each test.
- Clean only rows owned by that test.
- Fail when a test observes another fixture namespace.
Implementation constraints
- Do not use an unrestricted table truncation against shared databases.
Verification to include
- Run the tests independently and in reversed order.
- Inject foreign fixture rows and verify isolation.
Deliverables
- Fixture isolation repair.
Rollout and recovery
Adopt per-suite first; preserve failed fixture IDs for diagnosis without row contents.
Value of the work
For the engineer: Practice controlled diagnosis, isolation, and test reliability measurement.
For the team: Recover useful failure signals and reduce blind reruns without hiding product defects.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.