feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/arch/bot-flags/__tests__/read-from-context.test.ts

@@ -0,0 +1,63 @@
+/*
+ * 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 {
+  readFgPromiseFromContext,
+  readFgValuesFromContext,
+} from '../src/utils/read-from-context';
+
+describe('readFgPromiseFromContext', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should return feature flags if set within timeout', async () => {
+    const featureFlags = { feature1: true, feature2: false };
+    vi.stubGlobal(
+      '__fetch_fg_promise__',
+      Promise.resolve({ data: featureFlags }),
+    );
+
+    const result = await readFgPromiseFromContext();
+    expect(result).toEqual(featureFlags);
+  });
+
+  it('should return undefined if feature flags are not set', async () => {
+    vi.stubGlobal('__fetch_fg_promise__', undefined);
+    const result = await readFgPromiseFromContext();
+    expect(result).toBeUndefined();
+  });
+});
+
+describe('readFgValuesFromContext', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should return feature flags if set within timeout', () => {
+    const featureFlags = { feature1: true, feature2: false };
+    vi.stubGlobal('__fg_values__', featureFlags);
+
+    const result = readFgValuesFromContext();
+    expect(result).toEqual(featureFlags);
+  });
+
+  it('should return undefined if feature flags are not set', async () => {
+    vi.stubGlobal('__fg_values__', undefined);
+    const result = await readFgValuesFromContext();
+    expect(result).toBeUndefined();
+  });
+});