fix(dataset): 统一大小与版本元数据

backend/tests/test_platform_dataset_metadata.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from app.db.platform_store import dataset_file_version_summary, parse_size_bytes
+
+
+def test_parse_size_bytes_supports_legacy_units() -> None:
+    assert parse_size_bytes("21563 B") == 21563
+    assert parse_size_bytes("1.5 KB") == 1536
+    assert parse_size_bytes("2 MB") == 2 * 1024**2
+    assert parse_size_bytes(4096) == 4096
+    assert parse_size_bytes("unknown") == 0
+
+
+def test_dataset_file_version_summary_uses_active_version_metadata() -> None:
+    summary = dataset_file_version_summary(
+        {
+            "active_version_id": "file-1-v3",
+            "current_version_id": "file-1-v1",
+            "version_no": 1,
+            "versions": (
+                '[{"id":"file-1-v1","version":1},'
+                '{"id":"file-1-v3","version_no":3}]'
+            ),
+        }
+    )
+
+    assert summary == {
+        "active_version_id": "file-1-v3",
+        "current_version_id": "file-1-v3",
+        "current_version_no": 3,
+        "version_count": 2,
+    }
+
+
+def test_dataset_file_version_summary_uses_normalized_version_number_as_fallback() -> None:
+    summary = dataset_file_version_summary(
+        {
+            "active_version_id": "",
+            "current_version_id": None,
+            "version_no": 1,
+            "versions": "[]",
+        }
+    )
+
+    assert summary["current_version_no"] == 1
+    assert summary["version_count"] == 0