diff --git a/tests/unit/test_generated_question_sub_pattern.py b/tests/unit/test_generated_question_sub_pattern.py
index 4298c58..44f4659 100644
--- a/tests/unit/test_generated_question_sub_pattern.py
+++ b/tests/unit/test_generated_question_sub_pattern.py
@@ -21,16 +21,22 @@ def _candidate() -> CandidateQuestion:
 
 def test_generated_question_has_sub_pattern_default_none():
     q = GeneratedQuestion(
-        question_id="q1", video_id="v1", task_type="Action Recognition",
-        question="?", options=("A. x",), answer="A",
-        source_nodes=("n1",), difficulty="easy",
+        question_id="q1",
+        video_id="v1",
+        task_type="Action Recognition",
+        question="?",
+        options=("A. x",),
+        answer="A",
+        source_nodes=("n1",),
+        difficulty="easy",
     )
     assert q.sub_pattern is None
 
 
 def test_to_generated_question_threads_sub_pattern():
     q = _to_generated_question(
-        _candidate(), family="ACTION_RECOGNITION",
+        _candidate(),
+        family="ACTION_RECOGNITION",
         sub_pattern="premature_evidence_anchoring",
     )
     assert q.sub_pattern == "premature_evidence_anchoring"
@@ -43,12 +49,18 @@ def test_to_generated_question_sub_pattern_defaults_none():
 
 def test_question_to_entry_includes_sub_pattern():
     from tools.generate_questions import _question_to_entry
+
     q = GeneratedQuestion(
-        question_id="v1_Action Recognition_0001", video_id="v1",
-        task_type="Action Recognition", question="?",
-        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"), answer="A",
-        source_nodes=("n1",), difficulty="hard",
-        family="ACTION_RECOGNITION", skill_target="M1_AR",
+        question_id="v1_Action Recognition_0001",
+        video_id="v1",
+        task_type="Action Recognition",
+        question="?",
+        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"),
+        answer="A",
+        source_nodes=("n1",),
+        difficulty="hard",
+        family="ACTION_RECOGNITION",
+        skill_target="M1_AR",
         sub_pattern="temporal_reasoning_failure",
     )
     entry = _question_to_entry(q)
@@ -59,15 +71,22 @@ def test_question_to_entry_includes_sub_pattern():
 
 def test_append_to_json_writes_sub_pattern(tmp_path):
     from tools.generate_questions import _append_to_json
+
     q = GeneratedQuestion(
-        question_id="v1_Action Recognition_0001", video_id="v1",
-        task_type="Action Recognition", question="?",
-        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"), answer="A",
-        source_nodes=("n1",), difficulty="hard",
-        family="ACTION_RECOGNITION", skill_target="M1_AR",
+        question_id="v1_Action Recognition_0001",
+        video_id="v1",
+        task_type="Action Recognition",
+        question="?",
+        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"),
+        answer="A",
+        source_nodes=("n1",),
+        difficulty="hard",
+        family="ACTION_RECOGNITION",
+        skill_target="M1_AR",
         sub_pattern="temporal_reasoning_failure",
     )
     _append_to_json(tmp_path, q)
     import json
+
     data = json.loads((tmp_path / "v1.json").read_text(encoding="utf-8"))
     assert data[0]["sub_pattern"] == "temporal_reasoning_failure"