feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/chat-area/text-grab/__tests__/find-nearest-link-node.test.ts

@@ -0,0 +1,54 @@
+/*
+ * 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 { findNearestAnchor } from '../src/utils/helper/find-nearest-link-node';
+
+describe('findNearestAnchor', () => {
+  // 设置 DOM 环境
+  document.body.innerHTML = `
+    <div>
+      <a id="anchor1" href="#">
+        <span id="spanInsideAnchor">Text inside anchor</span>
+      </a>
+    </div>
+    <div>
+      <span id="spanOutsideAnchor">Text outside anchor</span>
+    </div>
+    <a id="anchor2" href="#">Another anchor</a>
+  `;
+
+  const spanInsideAnchor = document.getElementById('spanInsideAnchor') as Node;
+  const spanOutsideAnchor = document.getElementById(
+    'spanOutsideAnchor',
+  ) as Node;
+  const anchor1 = document.getElementById('anchor1') as Node;
+  const anchor2 = document.getElementById('anchor2') as Node;
+
+  it('should return the nearest anchor node when called from a descendant node', () => {
+    const result = findNearestAnchor(spanInsideAnchor);
+    expect(result).toBe(anchor1);
+  });
+
+  it('should return the node itself if it is an anchor', () => {
+    const result = findNearestAnchor(anchor2);
+    expect(result).toBe(anchor2);
+  });
+
+  it('should return null if there is no anchor ancestor', () => {
+    const result = findNearestAnchor(spanOutsideAnchor);
+    expect(result).toBeNull();
+  });
+});