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webui/backend/tests/unit/test_task_repository.py

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+from __future__ import annotations
+
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[3]))
+
+from backend.app.db.task_repository import TaskRepository
+
+
+class TaskRepositoryTest(unittest.TestCase):
+    def setUp(self) -> None:
+        self.temp_dir = tempfile.TemporaryDirectory()
+        self.db_path = str(Path(self.temp_dir.name) / "tasks.db")
+        self.repo = TaskRepository(self.db_path)
+
+    def tearDown(self) -> None:
+        self.temp_dir.cleanup()
+
+    def test_list_tasks_sorted_created_at_desc(self) -> None:
+        self.repo.insert_task_for_testing(
+            {
+                "id": "task-old",
+                "operation": "copy",
+                "status": "queued",
+                "source": "storage1/a",
+                "destination": "storage2/a",
+                "created_at": "2026-03-10T09:00:00Z",
+            }
+        )
+        self.repo.insert_task_for_testing(
+            {
+                "id": "task-new",
+                "operation": "move",
+                "status": "queued",
+                "source": "storage1/b",
+                "destination": "storage2/b",
+                "created_at": "2026-03-10T10:00:00Z",
+            }
+        )
+
+        tasks = self.repo.list_tasks()
+
+        self.assertEqual([task["id"] for task in tasks], ["task-new", "task-old"])
+
+    def test_insert_rejects_invalid_status(self) -> None:
+        with self.assertRaises(ValueError):
+            self.repo.insert_task_for_testing(
+                {
+                    "id": "task-x",
+                    "operation": "copy",
+                    "status": "unknown",
+                    "source": "storage1/a",
+                    "destination": "storage2/a",
+                    "created_at": "2026-03-10T09:00:00Z",
+                }
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()