fix(tests): memory leak

.github/workflows/test.yml

@@ -126,14 +126,12 @@ jobs:
         run: cd client && npm run lint:pages
 
       - name: Run tests
-        # Two separate OOM sources, both avoided here:
-        #  1) The v8 coverage report phase (source-map remapping over 150+ files)
-        #     OOMs even with a 12 GB heap, so coverage is NOT collected in CI.
-        #  2) Each forks worker runs ~38 files and jsdom/MSW state accumulates
-        #     past Node's default ~4 GB, so workers get extra heap.
-        # Run coverage locally with `npm run test:coverage`.
-        # TODO(#1258): re-enable coverage in CI via test sharding or the istanbul
-        # provider, then restore the artifact upload.
-        env:
-          NODE_OPTIONS: --max-old-space-size=8192
-        run: cd client && npm run test
+        run: cd client && npm run test:coverage
+
+      - name: Upload coverage
+        if: success()
+        uses: actions/upload-artifact@v6
+        with:
+          name: frontend-coverage
+          path: client/coverage/
+          retention-days: 7

client/src/hooks/useRouteCalculation.ts

@@ -9,12 +9,14 @@ import type { RouteSegment, RouteResult, Accommodation } from '../types'
 
 const TRANSPORT_TYPES = ['flight', 'train', 'bus', 'car', 'taxi', 'bicycle', 'cruise', 'ferry', 'transport_other']
 
+const NO_ACCOMMODATIONS: Accommodation[] = []
+
 /**
  * Manages route calculation state for a selected day. Extracts geo-coded waypoints from
  * day assignments, draws a straight-line route immediately, then upgrades it to real OSRM
  * road geometry with per-segment durations. Aborts in-flight requests when the day changes.
  */
-export function useRouteCalculation(tripStore: TripStoreState, selectedDayId: number | null, enabled: boolean = true, profile: 'driving' | 'walking' | 'cycling' = 'driving', accommodations: Accommodation[] = []) {
+export function useRouteCalculation(tripStore: TripStoreState, selectedDayId: number | null, enabled: boolean = true, profile: 'driving' | 'walking' | 'cycling' = 'driving', accommodations: Accommodation[] = NO_ACCOMMODATIONS) {
   const [route, setRoute] = useState<[number, number][][] | null>(null)
   const [routeInfo, setRouteInfo] = useState<RouteResult | null>(null)
   const [routeSegments, setRouteSegments] = useState<RouteSegment[]>([])

client/tests/integration/hooks/useRouteCalculation.test.ts

@@ -6,13 +6,16 @@ import { buildAssignment, buildPlace } from '../../helpers/factories';
 import type { TripStoreState } from '../../../src/store/tripStore';
 import type { RouteSegment } from '../../../src/types';
 
-// Mock the RouteCalculator module to avoid real OSRM fetch calls
-vi.mock('../../../src/components/Map/RouteCalculator', () => ({
-  calculateRouteWithLegs: vi.fn(),
-  calculateRoute: vi.fn(),
-  optimizeRoute: vi.fn((waypoints: unknown[]) => waypoints),
-  generateGoogleMapsUrl: vi.fn(),
-}));
+vi.mock('../../../src/components/Map/RouteCalculator', async (importActual) => {
+  const actual = await importActual<typeof import('../../../src/components/Map/RouteCalculator')>();
+  return {
+    ...actual,
+    calculateRouteWithLegs: vi.fn(),
+    calculateRoute: vi.fn(),
+    optimizeRoute: vi.fn((waypoints: unknown[]) => waypoints),
+    generateGoogleMapsUrl: vi.fn(),
+  };
+});
 
 const { calculateRouteWithLegs } = await import('../../../src/components/Map/RouteCalculator');