Verify totals remain stable across delivery-option switching
Changing options twice sometimes charges the first option while displaying the second.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Concurrency testing · Numeric correctness
Estimated field mix
- Quality engineering60%
- Frontend40%
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 retailer is changing delivery options. Its regression suite is large, but no one can explain whether inventory, totals, or recovery behavior is covered.
Setup prerequisites
- Build a minimal local checkout fixture with synthetic prices, inventory, and a mock delivery provider.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Use the selected option consistently in displayed and submitted totals.
- Invalidate stale quotes when inputs change.
- Prevent submission while the current quote is unresolved.
Implementation constraints
- Represent amounts in exact minor units.
Verification to include
- Switch options rapidly and verify the final total.
- Resolve an old quote late and confirm it cannot overwrite selection.
Deliverables
- Quote-race regression.
Rollout and recovery
Ship with the corrected quote binding; revert the option feature if totals diverge.
Value of the work
For the engineer: Practice risk analysis, exploratory testing, and evidence-based release decisions.
For the team: Provide a reviewable release assessment tied to customer-impacting invariants.
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.