diff --git a/tests/basic/test_reasoning.py b/tests/basic/test_reasoning.py
index c2e283f32..10a8ad8ce 100644
--- a/tests/basic/test_reasoning.py
+++ b/tests/basic/test_reasoning.py
@@ -25,10 +25,10 @@ class TestReasoning(unittest.TestCase):
         class MockCompletion:
             def __init__(self, content, reasoning_content):
                 self.content = content
-                self.reasoning_content = reasoning_content
                 # Add required attributes expected by show_send_output
                 self.choices = [MagicMock()]
                 self.choices[0].message.content = content
+                self.choices[0].message.reasoning_content = reasoning_content
                 self.finish_reason = "stop"
 
         mock_completion = MockCompletion(main_content, reasoning_content)