feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/chat-area/text-grab/__tests__/find-last-sibling-node.test.ts

@@ -0,0 +1,58 @@
+/*
+ * 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 { findLastSiblingNode } from '../src/utils/helper/find-last-sibling-node';
+
+describe('findLastSiblingNode', () => {
+  // 设置 DOM 环境
+  document.body.innerHTML = `
+    <div id="ancestor">
+      <div id="sibling1" data-scope="valid"></div>
+      <div id="sibling2" data-scope="invalid"></div>
+      <div id="sibling3" data-scope="valid"></div>
+      <div id="sibling4" data-scope="valid"></div>
+    </div>
+  `;
+
+  const sibling1 = document.getElementById('sibling1');
+  const sibling4 = document.getElementById('sibling4');
+
+  it('should return the last sibling node that meets the condition', () => {
+    const result = findLastSiblingNode({
+      node: sibling1,
+      scopeAncestorAttributeName: 'data-scope',
+      targetAttributeValue: 'valid',
+    });
+    expect(result).toBe(sibling4);
+  });
+
+  it('should return null if no sibling node meets the condition', () => {
+    const result = findLastSiblingNode({
+      node: sibling1,
+      scopeAncestorAttributeName: 'data-scope',
+      targetAttributeValue: 'hhhh',
+    });
+    expect(result).toBeNull();
+  });
+
+  it('should return null when the scopeAncestorAttributeName is not provided', () => {
+    const result = findLastSiblingNode({
+      node: sibling1,
+      targetAttributeValue: 'valid',
+    });
+    expect(result).toBeNull();
+  });
+});