Create isolated provider states for contract examples
Contracts depend on whichever orders happen to exist in a shared test database.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Fixtures · Test isolation
Estimated field mix
- Quality engineering100%
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
- Create named states with deterministic synthetic identities.
- Reset each state independently.
- Reject unrecognized state names instead of selecting a default.
Implementation constraints
- State setup is accessible only inside the local harness.
Verification to include
- Run states in either order.
- Request an unknown state and verify no default data leaks.
Deliverables
- Provider-state fixture harness.
Rollout and recovery
Use the isolated harness for new contracts; retire shared mutable fixtures.
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.