fix: extend correctness fail-fast to test-side pool questions (P5)

tests/unit/test_pools_video_atomic.py

@@ -71,6 +71,27 @@ def test_invalid_assignment_value_fails_fast():
         )
 
 
+def test_val_ratio_out_of_range_fails_fast():
+    """val_ratio 越界（<0 或 >1）时 fail-fast。"""
+    qs = [_q("v1-1", "v1")]
+    assignment = {"v1": "trainval"}
+    correctness = {"v1-1": True}
+    for bad in (-0.1, 1.5):
+        with pytest.raises(ValueError, match="val_ratio"):
+            split_by_video_assignment(
+                qs, assignment, correctness=correctness, val_ratio=bad, seed=0
+            )
+
+
+def test_missing_correctness_on_test_side_fails_fast():
+    """test 侧某题缺 correctness 时 fail-fast，不静默兜底 False 污染评估口径。"""
+    qs = [_q("v1-1", "v1"), _q("v2-1", "v2")]
+    assignment = {"v1": "trainval", "v2": "test"}
+    correctness = {"v1-1": True}  # 缺 test 侧 v2-1
+    with pytest.raises(ValueError, match="correctness"):
+        split_by_video_assignment(qs, assignment, correctness=correctness, val_ratio=0.0, seed=0)
+
+
 def test_video_group_atomic_in_trainval_split():
     """trainval 内 val 切分以视频组为原子：同 video 的题整组同落 train 或 val。"""
     qs = [