Fixed mock comparison error

tests/test_conversation_field_mapping.py

@@ -129,7 +129,20 @@ async def test_unknown_tool_defaults_to_prompt():
     with patch("utils.conversation_memory.get_thread", return_value=mock_context):
         with patch("utils.conversation_memory.add_turn", return_value=True):
             with patch("utils.conversation_memory.build_conversation_history", return_value=("History", 500)):
-                # The autouse fixture should handle provider mocking
+                # Mock ModelContext to avoid calculation errors
+                with patch("utils.model_context.ModelContext") as mock_model_context_class:
+                    mock_model_context = MagicMock()
+                    mock_model_context.model_name = "gemini-2.5-flash-preview-05-20"
+                    mock_model_context.calculate_token_allocation.return_value = MagicMock(
+                        total_tokens=200000,
+                        content_tokens=120000,
+                        response_tokens=80000,
+                        file_tokens=48000,
+                        history_tokens=48000,
+                        available_for_prompt=24000,
+                    )
+                    mock_model_context_class.from_arguments.return_value = mock_model_context
+
                     arguments = {
                         "continuation_id": "test-thread-456",
                         "prompt": "User input",