feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/chat-area/utils/__tests__/async.test.ts

@@ -0,0 +1,53 @@
+/*
+ * 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, expect, vi } from 'vitest';
+
+import { Deferred, sleep } from '../src/async';
+
+it('sleep', async () => {
+  vi.useFakeTimers();
+  let count = 0;
+  sleep(1000).then(() => (count = 1));
+  vi.runAllTimers();
+  expect(count).toBe(0);
+  await Promise.resolve();
+  expect(count).toBe(1);
+});
+
+describe('test deferred', () => {
+  it('works', async () => {
+    const deferred = new Deferred<number>();
+    deferred.resolve(1);
+    expect(await deferred.promise).toBe(1);
+  });
+
+  it('reject', async () => {
+    const deferred = new Deferred();
+    deferred.reject(123);
+    try {
+      await deferred.promise;
+    } catch (err) {
+      expect(err).toBe(123);
+    }
+  });
+
+  it('perform like promise', async () => {
+    const deferred = new Deferred<string>();
+    deferred.resolve('1');
+    expect(await deferred).toBe('1');
+  });
+});