add test

src/views/Sidebar/__tests__/sidebarSettingsUtils.test.js

@@ -0,0 +1,69 @@
+import { describe, expect, test } from 'vitest';
+
+import {
+    normalizeFavoriteGroupsChange,
+    resolveFavoriteGroups
+} from '../sidebarSettingsUtils';
+
+// ─── resolveFavoriteGroups ───────────────────────────────────────────
+
+describe('resolveFavoriteGroups', () => {
+    const allKeys = ['group_1', 'group_2', 'local:MyGroup'];
+
+    test('returns allKeys when stored is empty (= all)', () => {
+        expect(resolveFavoriteGroups([], allKeys)).toEqual(allKeys);
+    });
+
+    test('returns stored value when not empty', () => {
+        const stored = ['group_1'];
+        expect(resolveFavoriteGroups(stored, allKeys)).toEqual(stored);
+    });
+
+    test('returns stored even if it equals allKeys', () => {
+        expect(resolveFavoriteGroups([...allKeys], allKeys)).toEqual(allKeys);
+    });
+
+    test('handles empty allKeys', () => {
+        expect(resolveFavoriteGroups([], [])).toEqual([]);
+    });
+});
+
+// ─── normalizeFavoriteGroupsChange ───────────────────────────────────
+
+describe('normalizeFavoriteGroupsChange', () => {
+    const allKeys = ['group_1', 'group_2', 'local:MyGroup'];
+
+    test('returns [] when value is null', () => {
+        expect(normalizeFavoriteGroupsChange(null, allKeys)).toEqual([]);
+    });
+
+    test('returns [] when value is empty array', () => {
+        expect(normalizeFavoriteGroupsChange([], allKeys)).toEqual([]);
+    });
+
+    test('returns [] when all groups are selected', () => {
+        expect(normalizeFavoriteGroupsChange([...allKeys], allKeys)).toEqual(
+            []
+        );
+    });
+
+    test('returns [] when value is superset of allKeys', () => {
+        expect(
+            normalizeFavoriteGroupsChange([...allKeys, 'extra'], allKeys)
+        ).toEqual([]);
+    });
+
+    test('returns filter subset when not all selected', () => {
+        const subset = ['group_1'];
+        expect(normalizeFavoriteGroupsChange(subset, allKeys)).toEqual(subset);
+    });
+
+    test('returns filter subset with two items', () => {
+        const subset = ['group_1', 'group_2'];
+        expect(normalizeFavoriteGroupsChange(subset, allKeys)).toEqual(subset);
+    });
+
+    test('treats non-empty value as all-selected when allKeys is empty (vacuous truth)', () => {
+        expect(normalizeFavoriteGroupsChange(['group_1'], [])).toEqual([]);
+    });
+});