From 085da18205e144968781de9b9c5bb04179f561a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BD=90=E8=97=A4=E5=84=AA=E4=B8=80?=
 <y_sato@satouyuuichinoMac-mini.local>
Date: Mon, 11 Aug 2025 11:01:16 +0900
Subject: [PATCH] Fix Mock len() error: Correct bind_tools chain

- bind_tools() now returns a mock chain
- chain.invoke() returns the result with tool_calls attribute
- Fixes TypeError: object of type 'Mock' has no len()
---
 tests/conftest.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/conftest.py b/tests/conftest.py
index 742d2a47..d1e88bdb 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -37,8 +37,13 @@ def mock_llm():
     mock_result.content = "Test response"
     mock_result.tool_calls = []  # Add tool_calls attribute for len() check
 
+    # Fix: bind_tools returns a chain, chain.invoke returns the result
+    mock_chain = Mock()
+    mock_chain.invoke.return_value = mock_result
+    mock.bind_tools.return_value = mock_chain
+
+    # Keep direct invoke for backward compatibility
     mock.invoke.return_value = mock_result
-    mock.bind_tools.return_value = mock
     return mock