test(harness): continue bounded risk-reduction with shared service harness

memory-bank/change-log.md

@@ -2076,3 +2076,36 @@ Validation:
 Follow-ups:
 
 - Optional consolidation: extract shared phase6/phase7 VM loader helpers into a single test utility to reduce duplication.
+
+---
+
+### CL-059: TASK22260 next slice — shared service harness extraction (continued bounded risk-reduction)
+
+date: 2026-03-25
+author: Cline
+scope: `tests/{serviceHarness,phase6/service-behaviour,phase7/service-behaviour}.cjs`
+type: change
+rationale: Continue the bounded risk-reduction stream by removing duplicated test harness infrastructure across phase6/phase7 service behavioural suites and centralizing client-wrapper-compatible mocks.
+impact: Reduces test harness drift risk and keeps client-wrapper migration verification stable across multiple suites, without runtime code changes.
+status: completed
+
+Summary:
+
+- Added shared helper module `tests/serviceHarness.cjs` with reusable:
+    - `createAxiosMock`
+    - `createLoggerMock`
+    - `createAxiosError`
+    - `loadServiceModule` (with default `getJson`/`requestJson`/`buildHashedQueryUrl` injections)
+    - `normalize`
+- Refactored `tests/phase6/service-behaviour.test.cjs` to import shared harness utilities and remove duplicated local harness implementation.
+- Refactored `tests/phase7/service-behaviour.test.cjs` to import shared harness utilities and remove duplicated local harness implementation.
+
+Validation:
+
+- `node tests/phase6/service-behaviour.test.cjs` -> pass (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (12/12)
+- `npm run lint` -> warnings only (pre-existing `react-hooks/exhaustive-deps`; no new lint errors)
+
+Follow-ups:
+
+- Optional next bounded risk-reduction slice: evaluate whether other legacy service test suites can adopt `tests/serviceHarness.cjs` to standardize migration-era service mocking behavior.