fix(tracks): retry ccextractor on the repackaged file

tests/tracks/test_ccextractor_retry.py

@@ -0,0 +1,41 @@
+"""Tests for the repackaged-copy retry in ``Video.ccextractor``."""
+
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+from typing import Any
+
+import pytest
+from langcodes import Language
+
+from unshackle.core.tracks import Video
+from unshackle.core.tracks import video as video_module
+
+
+def test_retry_runs_on_the_repackaged_file(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    original = tmp_path / "v.mp4"
+    original.write_bytes(b"x")
+    repacked = tmp_path / "v_repack.mp4"
+    track = Video(id_="v", url="https://example.test/v.m3u8", language="en", codec=Video.Codec.AVC)
+    track.path = original
+
+    def fake_repackage() -> None:
+        original.unlink()
+        repacked.write_bytes(b"x")
+        track.path = repacked
+
+    inputs: list[Path] = []
+
+    def fake_run(args: list[Any], **_: Any) -> None:
+        inputs.append(Path(args[-1]))
+        if not Path(args[-1]).exists():
+            raise subprocess.CalledProcessError(2, args)  # ccextractor: no input file
+        raise subprocess.CalledProcessError(10, args)  # ccextractor: no captions found
+
+    monkeypatch.setattr(video_module.binaries, "CCExtractor", Path("/usr/bin/ccextractor"))
+    monkeypatch.setattr(video_module.subprocess, "run", fake_run)
+    monkeypatch.setattr(track, "repackage", fake_repackage)
+
+    assert track.ccextractor("cc", tmp_path / "cc.srt", Language.get("en")) is None
+    assert inputs == [original, repacked]