test: guard non-AR flip isolation and AR flip-capable set

tests/unit/test_sub_pattern_flip.py

@@ -31,3 +31,29 @@ def test_other_ar_sub_patterns_keep_defaults():
             continue
         assert sp.supports_flip is False, sp.name
         assert sp.flip_axis is None, sp.name
+
+
+def test_non_ar_strategies_have_no_flip_capable_sub_pattern():
+    """非 AR 题型走 BaseTaskTypeStrategy，无 SubPattern（select_sub_pattern 返回 None），
+    故不存在 flip-capable 子模式——翻转门对它们天然跳过。"""
+    import random
+    from app.question_gen.strategy import get_strategy
+
+    non_ar = [
+        "Action Reasoning", "Attribute Perception", "Counting Problem",
+        "Information Synopsis", "Object Recognition", "Object Reasoning",
+        "OCR Problems", "Spatial Perception", "Spatial Reasoning",
+        "Temporal Perception", "Temporal Reasoning",
+    ]
+    rng = random.Random(0)
+    for tt in non_ar:
+        assert get_strategy(tt).select_sub_pattern(rng) is None, tt
+
+
+def test_only_two_ar_sub_patterns_support_flip():
+    """全 6 个 AR SubPattern 中恰有 2 个 supports_flip=True，其余 4 个默认 False。"""
+    from app.question_gen.strategy_action_recognition import AR_SUB_PATTERNS
+
+    flip_names = {sp.name for sp in AR_SUB_PATTERNS if sp.supports_flip}
+    assert flip_names == {"temporal_reasoning_failure", "cross_segment_entity_tracking"}
+    assert all(sp.flip_axis is None for sp in AR_SUB_PATTERNS if not sp.supports_flip)