Fix qwen tests issues

Author: Mateusz

src/core/app/stages/test_stages.py

@@ -292,13 +292,14 @@ async def mock_chat_completions(
                     exc_info=True,
                 )
 
-            # Check if tools are requested
-            tools = getattr(request, "tools", None) if request else None
-            tool_choice = getattr(request, "tool_choice", None) if request else None
-            has_tools = bool(tools or tool_choice)
-
-            # Create message content based on whether tools are requested
-            if has_tools:
+            # Check if tools are requested
+            tools = getattr(request, "tools", None) if request else None
+            tool_choice = getattr(request, "tool_choice", None) if request else None
+            # Respect tool_choice="none" - don't return tool_calls when explicitly disabled
+            should_return_tool_calls = bool(tools) and tool_choice != "none"
+
+            # Create message content based on whether tools are requested
+            if should_return_tool_calls:
                 message_content = {
                     "role": "assistant",
                     "content": "Mock response from test backend",