Resume failed episode batch retries

test_app.py

@@ -613,6 +613,30 @@ class QueueApiTests(unittest.TestCase):
         self.assertEqual(retried["status"], "pending")
         self.assertEqual(retried["result_index"], 4)
 
+    def test_covered_episodes_includes_completed_and_remaining_retry_parts(self):
+        created = self.queue.add(
+            {
+                "show_id": "show-42",
+                "query": "Retry Coverage",
+                "title": "Retry Coverage",
+                "anime_name": "Retry Coverage",
+                "mode": "sub",
+                "quality": "best",
+                "episodes": "1-3",
+                "download_dir": "/tmp/example",
+                "season": "1",
+            }
+        )
+        with self.queue.lock:
+            job = self.queue._find(created["id"])
+            job["completed_episodes"] = ["1"]
+            job["retry_episodes"] = "2-3"
+            self.queue._save_job_locked(job)
+
+        covered = self.queue.covered_episodes("show-42", "sub", ["1", "2", "3", "4"])
+
+        self.assertEqual(covered, {"1", "2", "3"})
+
     def test_add_reuses_matching_failed_job_instead_of_creating_duplicate(self):
         payload = {
             "show_id": "show-42",
@@ -1099,6 +1123,16 @@ class DownloadQueueWorkerFailureTests(unittest.TestCase):
             self.assertFalse(staged_episode.exists())
             self.assertFalse(staging_dir.exists())
             self.assertIn(f"Saved: {final_episode}", stored["log"])
+            self.assertEqual(stored["completed_episodes"], ["1"])
+            self.assertEqual(stored["retry_episodes"], "2")
+
+            retried = queue.retry(job["id"])
+            command = APP.app_support.command_for_job(retried)
+
+            self.assertEqual(retried["status"], "pending")
+            self.assertEqual(retried["episodes"], "1-2")
+            self.assertEqual(retried["retry_episodes"], "2")
+            self.assertEqual(command[command.index("--episodes") + 1], "2")
 
     def test_successful_detached_download_logs_sync_skipped(self):
         queue = APP.DownloadQueue(
@@ -2158,6 +2192,20 @@ class WatchlistCompletionTests(unittest.TestCase):
 
         self.assertNotIn("-S", command)
 
+    def test_command_for_job_uses_retry_episode_spec_when_present(self):
+        command = APP.app_support.command_for_job(
+            {
+                "query": "Queue Show",
+                "quality": "best",
+                "episodes": "1-12",
+                "retry_episodes": "3-12",
+                "mode": "dub",
+            },
+            download_path="/tmp/kaizoku-staging",
+        )
+
+        self.assertEqual(command[command.index("--episodes") + 1], "3-12")
+
     def test_download_watchlist_item_queues_full_episode_range_for_selected_mode(self):
         item = {
             "show_id": "show-42",