Feature-Test RE Sanitization

+import unittest
+
+from ReportEngine.ir import IRValidator
+from ReportEngine.nodes.chapter_generation_node import ChapterGenerationNode
+
+
+class ChapterSanitizationTestCase(unittest.TestCase):
+    """Lightweight regression tests for the chapter sanitization helpers."""
+
+    def setUp(self):
+        self.node = ChapterGenerationNode(llm_client=None, validator=IRValidator(), storage=None)
+
+    def test_table_cell_empty_blocks_repaired(self):
+        chapter = {
+            "blocks": [
+                {
+                    "type": "table",
+                    "rows": [
+                        {
+                            "cells": [
+                                {"blocks": []},
+                                {"text": "同比变化", "blocks": None},
+                            ]
+                        }
+                    ],
+                }
+            ]
+        }
+        self.node._sanitize_chapter_blocks(chapter)
+        table_block = chapter["blocks"][0]
+        cells = table_block["rows"][0]["cells"]
+        self.assertEqual(len(cells), 2)
+        for cell in cells:
+            blocks = cell.get("blocks")
+            self.assertIsInstance(blocks, list)
+            self.assertGreater(len(blocks), 0)
+            for block in blocks:
+                self.assertEqual(block.get("type"), "paragraph")
+
+    def test_table_rows_scalar_values_expanded(self):
+        chapter = {"blocks": [{"type": "table", "rows": ["全国趋势"]}]}
+        self.node._sanitize_chapter_blocks(chapter)
+        table_block = chapter["blocks"][0]
+        self.assertEqual(len(table_block["rows"]), 1)
+        row = table_block["rows"][0]
+        self.assertIn("cells", row)
+        self.assertEqual(len(row["cells"]), 1)
+        cell = row["cells"][0]
+        self.assertIsInstance(cell.get("blocks"), list)
+        self.assertEqual(
+            cell["blocks"][0]["inlines"][0]["text"],
+            "全国趋势",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()