Test authorization before provider-state response lookup
A contract fixture returns an order by ID even when the caller belongs to another merchant.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Authorization · Contract testing
Estimated field mix
- Quality engineering50%
- Security50%
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 fulfillment API serves a web checkout and warehouse adapter. Provider tests pass while consumers fail on subtle response and error changes.
Setup prerequisites
- Author two small local consumers and one mock provider with versioned synthetic responses.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Scope reads by authenticated merchant at the repository boundary.
- Use non-enumerating denial semantics.
- Keep privileged fixture setup unavailable to consumers.
Implementation constraints
- Contract success must not bypass authorization.
Verification to include
- Read an owned order.
- Request another merchant's order and compare safe denial behavior.
Deliverables
- Cross-merchant contract cases.
Rollout and recovery
Block compatibility approval when tenant denial regresses.
Value of the work
For the engineer: Practice executable contracts, meaningful negative tests, and compatibility triage.
For the team: Expose integration regressions before deployment without requiring every system to run together.
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.