feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/arch/bot-flags/__tests__/use-flags.test.ts

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { renderHook, act } from '@testing-library/react-hooks';
+
+import { featureFlagStorage } from '../src/utils/storage';
+import { useFlags } from '../src/use-flags'; // Adjust the import path
+import { getFlags } from '../src/get-flags';
+
+vi.mock('../src/utils/storage', () => ({
+  featureFlagStorage: {
+    on: vi.fn(),
+    off: vi.fn(),
+  },
+}));
+
+vi.mock('../src/get-flags', () => ({
+  getFlags: vi.fn(),
+}));
+
+describe('useFlags', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+  });
+
+  it('should return initial flags', () => {
+    const initialFlags = { feature1: true, feature2: false };
+    getFlags.mockImplementation(() => initialFlags);
+
+    const { result } = renderHook(() => useFlags());
+
+    expect(result.current[0]).toEqual(initialFlags);
+  });
+
+  it('should update flags on storage change', () => {
+    const initialFlags = { feature1: true, feature2: false };
+    const updatedFlags = { feature1: false, feature2: true };
+    getFlags.mockImplementation(() => initialFlags);
+
+    const { result } = renderHook(() => useFlags());
+
+    act(() => {
+      getFlags.mockImplementation(() => updatedFlags);
+      featureFlagStorage.on.mock.calls[0][1](); // Simulate 'change' event
+    });
+
+    expect(result.current[0]).toEqual(updatedFlags);
+  });
+
+  it('should remove event listener on unmount', () => {
+    const { unmount } = renderHook(() => useFlags());
+
+    unmount();
+
+    expect(featureFlagStorage.off).toHaveBeenCalled();
+  });
+});