落地私聊附件询价：发卡走 H5 收 Excel/PDF，认成口播再复用三线文字流程，避免附件卡在识别或退成纯文本。

Co-authored-by: Cursor <cursoragent@cursor.com>

inquiry-agent/tests/test_extract_attachment.py

@@ -0,0 +1,61 @@
+"""
+Excel / PDF 抽纯文本：不猜字段。
+"""
+
+from __future__ import annotations
+
+import io
+import os
+import sys
+import unittest
+
+ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+if ROOT not in sys.path:
+    sys.path.insert(0, ROOT)
+
+from agent.policy.attachment_extract import allowed_attachment, extract_attachment_text
+
+
+def _xlsx_bytes() -> bytes:
+    from openpyxl import Workbook
+
+    wb = Workbook()
+    ws = wb.active
+    ws.title = "询价"
+    ws["A1"] = "海运"
+    ws["B1"] = "上海到洛杉矶"
+    ws["A2"] = "1x40HQ"
+    buf = io.BytesIO()
+    wb.save(buf)
+    return buf.getvalue()
+
+
+class ExtractAttachmentTests(unittest.TestCase):
+    def test_allow_only_excel_pdf(self) -> None:
+        self.assertTrue(allowed_attachment("a.XLSX"))
+        self.assertTrue(allowed_attachment("b.xls"))
+        self.assertTrue(allowed_attachment("c.pdf"))
+        self.assertFalse(allowed_attachment("d.png"))
+        self.assertFalse(allowed_attachment("e.docx"))
+        self.assertFalse(allowed_attachment("f.zip"))
+
+    def test_reject_image_bytes(self) -> None:
+        got = extract_attachment_text("shot.png", b"\x89PNG")
+        self.assertFalse(got["ok"])
+        self.assertEqual(got["error"], "only_xlsx_xls_pdf")
+
+    def test_xlsx_cells_become_text(self) -> None:
+        got = extract_attachment_text("sea.xlsx", _xlsx_bytes())
+        self.assertTrue(got["ok"])
+        self.assertIn("海运", got["text"])
+        self.assertIn("上海到洛杉矶", got["text"])
+        self.assertIn("1x40HQ", got["text"])
+
+    def test_empty_bytes_fail(self) -> None:
+        got = extract_attachment_text("a.xlsx", b"")
+        self.assertFalse(got["ok"])
+        self.assertTrue(got["empty"])
+
+
+if __name__ == "__main__":
+    unittest.main()