fix: fail-loud on node without time info; anchor test store path

tests/unit/test_tree_nodes.py

@@ -7,7 +7,7 @@ import pytest
 
 from app.harness.tree_nodes import load_tree_data_for_videos, load_tree_nodes
 
-_STORE = Path("store")
+_STORE = Path(__file__).resolve().parents[2] / "store"
 _VID = "0RxMZBLeqRI"  # 真实样本，111 节点
 
 
@@ -68,6 +68,16 @@ def test_roots_not_list_raises_value_error(tmp_path):
         load_tree_nodes(tmp_path, "vX")
 
 
+def test_node_without_time_info_raises_value_error(tmp_path):
+    vdir = tmp_path / "videos" / "vX"
+    vdir.mkdir(parents=True)
+    (vdir / "tree.json").write_text(
+        json.dumps({"roots": [{"id": "n1", "card": {}}]}), encoding="utf-8"
+    )
+    with pytest.raises(ValueError):
+        load_tree_nodes(tmp_path, "vX")
+
+
 def test_load_for_videos_dedups():
     data = load_tree_data_for_videos(_STORE, [_VID, _VID])
     assert set(data.keys()) == {_VID}