T-566 封面历史归档数据层

tests/test_image_paths.py

@@ -1,5 +1,6 @@
 import os
 import sys
+import tempfile
 import unittest
 from types import SimpleNamespace
 
@@ -33,6 +34,46 @@ class ImagePathTests(unittest.TestCase):
             path,
         )
 
+    def test_list_task_cover_candidates_filters_and_sorts_generated_covers(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            task = SimpleNamespace(id=42, batch_id="batch-a", item_id="51100639510", alias="alias-a")
+            canonical = image_paths.task_image_path(temp_dir, task, suffix="new")
+            directory = os.path.dirname(canonical)
+            prefix = os.path.splitext(os.path.basename(canonical))[0]
+            os.makedirs(directory, exist_ok=True)
+            filenames = [
+                f"{prefix}_20260709094800.jpg",
+                f"{prefix}_20260709094800_2.jpg",
+                f"{prefix}_20260709094900.jpg",
+                f"{prefix}.jpg",
+                f"{prefix}_bad.jpg",
+                f"{prefix.replace('_new', '_old')}.jpg",
+                f"{prefix}.png",
+                "99_51100639510_new.jpg",
+            ]
+            for filename in filenames:
+                with open(os.path.join(directory, filename), "wb") as fh:
+                    fh.write(b"jpeg")
+
+            paths = image_paths.list_task_cover_candidates(temp_dir, task)
+
+            self.assertEqual(
+                [
+                    canonical,
+                    os.path.join(directory, f"{prefix}_20260709094900.jpg"),
+                    os.path.join(directory, f"{prefix}_20260709094800_2.jpg"),
+                    os.path.join(directory, f"{prefix}_20260709094800.jpg"),
+                    os.path.join(directory, f"{prefix}_bad.jpg"),
+                ],
+                paths,
+            )
+
+    def test_list_task_cover_candidates_returns_empty_for_missing_directory(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            task = SimpleNamespace(id=42, batch_id="batch-a", item_id="51100639510", alias="alias-a")
+
+            self.assertEqual([], image_paths.list_task_cover_candidates(temp_dir, task))
+
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()