[Test Improver] test: add unit tests for gc-root-store.js

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🤖 Test Improver — automated AI assistant

Goal and Rationale

shell/utils/gc/gc-root-store.js had zero test coverage. It provides the Vuex getters and actions that coordinate garbage collection across all registered stores. While adjacent files (gc.ts, gc-interval.ts, gc-route-changed.ts) already have tests, the root store orchestration layer was untested.

Approach

• gcGetters.gcStores — pure getter: 4 tests covering multi-store results, no-match, primitive state entries (skipped), and empty state.
• gcActions.gcRouteChanged/gcStartIntervals/gcStopIntervals — delegation tests: verify each action calls the correct underlying module with the expected arguments.
• gcActions.gcResetStores — 2 tests: dispatches per-store reset for each gc-enabled store, and dispatches nothing when no stores.
• gcActions.garbageCollect — 3 tests: dispatches per-store gc when setting enabled, no dispatch when disabled, no dispatch when no stores.
• gcActions.gcPreferencesUpdated — 3 tests: enables (start intervals), disables-was-on (reset stores), disables-was-off (only stop intervals).

All dependencies (gc, gc-interval, gc-route-changed) are mocked via jest.resetModules() + jest.mock() per the existing gc test pattern.

Coverage Impact

Metric	Before	After
Statements	0%	100%
Branches	0%	100%
Functions	0%	100%
Lines	0%	100%

Test Status

All 15 tests pass. ESLint reports no warnings.

node_modules/.bin/jest shell/utils/gc/__tests__/gc-root-store.test.ts

Trade-offs

Simple dispatch-mock tests. Minimal maintenance burden since they follow the same pattern as existing gc tests.

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