human hand off fix

backend/tests/test_human_handoff_service.py

@@ -1,6 +1,10 @@
+import pytest
+
 from app.services.human_handoff_service import (
     MESSAGE_SCOPE_EXTERNAL,
     MESSAGE_SCOPE_HANDOFF,
+    _body_has_quote_trail,
+    _mirror_from_identity,
     build_handoff_subject,
     maybe_trigger_handoff,
     process_human_reply,
@@ -20,6 +24,80 @@ def test_human_handoff_runtime_is_enabled():
     assert callable(resolve_handoff_from_inbound)
 
 
+@pytest.mark.asyncio
+async def test_mirror_body_appends_external_history_when_missing(monkeypatch):
+    from types import SimpleNamespace
+    from unittest.mock import AsyncMock
+
+    from app.services.human_handoff_service import _mirror_body_with_trail
+
+    parent = {
+        "_id": "parent",
+        "sender": {"name": "Parth Dixit", "address": "parthdixit091@gmail.com"},
+        "body_text": "sender: C\n\nOn earlier Suyash Dixit wrote:\n> responder: B",
+        "body_html": None,
+        "sent_at": None,
+    }
+    monkeypatch.setattr(
+        "app.services.human_handoff_service._latest_thread_message",
+        AsyncMock(return_value=parent),
+    )
+    monkeypatch.setattr(
+        "app.services.human_handoff_service.load_mirror_payload",
+        AsyncMock(return_value=SimpleNamespace(body_text=parent["body_text"], body_html=None)),
+    )
+    text, html = await _mirror_body_with_trail(
+        SimpleNamespace(),
+        account_id="account-1",
+        handoff={"external_thread_id": "thread"},
+        source={"_id": "child", "new_reply_content": "responder: D", "new_reply_html": None},
+        payload=SimpleNamespace(body_text="responder: D", body_html=None),
+    )
+    assert text.startswith("responder: D")
+    assert "parthdixit091@gmail.com" in text
+    assert "> sender: C" in text
+    assert "responder: B" in text
+    assert html and "gmail_quote" in html
+
+
+def test_quote_trail_is_detected_in_forwarded_history():
+    assert _body_has_quote_trail(
+        "responder: B\n\nOn Tue, Oct 6, 2026 at 7:44 AM Suyash Dixit wrote:\n> sender: A",
+        None,
+    )
+    assert _body_has_quote_trail(
+        "sender: C",
+        '<div>sender: C</div><div class="gmail_quote">sender: A</div>',
+    )
+    assert _body_has_quote_trail("sender: E", None) is False
+
+
+def test_mirror_from_uses_one_address_not_both():
+    name, address = _mirror_from_identity(
+        {
+            "direction": "inbound",
+            "sender": {
+                "name": "Suyash Dixit",
+                "address": "suyashdixit091@gmail.com",
+            },
+        },
+        "Suyash Dixit",
+        "suyash@gentic.email",
+    )
+    assert name == "Suyash Dixit"
+    assert address == "suyashdixit091@gmail.com"
+    assert "gentic.email" not in address
+
+    agent_name, agent_address = _mirror_from_identity(
+        {"direction": "outbound", "sender": {"address": "suyash@gentic.email"}},
+        "Suyash Dixit",
+        "suyash@gentic.email",
+    )
+    assert agent_name == "Suyash Dixit"
+    assert agent_address == "suyash@gentic.email"
+    assert "gmail.com" not in agent_address
+
+
 def test_private_subject_contains_customer_name_and_external_subject():
     subject = build_handoff_subject(
         sender_name="Parth Dixit",