Smal

frontend/src/lib/url-state.test.ts

@@ -196,6 +196,32 @@ describe('url-state', () => {
     expect(state.overlays).toEqual(new Set(['noise', 'crime-hotspots']));
   });
 
+  it('enables crime + trees overlays by default on a fresh visit', () => {
+    const state = parseUrlState();
+
+    expect(state.overlays).toEqual(new Set(['crime-hotspots', 'trees-outside-woodlands']));
+  });
+
+  it('round-trips an explicit "all overlays off" via the __none sentinel', () => {
+    const params = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      new Set()
+    );
+
+    expect(params.getAll('overlay')).toEqual(['__none']);
+
+    window.history.replaceState({}, '', `/?${params.toString()}`);
+    const state = parseUrlState();
+
+    expect(state.overlays).toEqual(new Set());
+  });
+
   it('round-trips satellite basemap selection', () => {
     const params = stateToParams(
       null,