add program files

tests/export/test_write_sorted.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from audiobooksorter.export import write_sorted
+from audiobooksorter.ingest import AudiobookRecord
+
+
+def test_write_sorted_copies_source_directories(tmp_path: Path) -> None:
+    source = tmp_path / "library"
+    book_dir = source / "Brandon" / "Mistborn1"
+    book_dir.mkdir(parents=True)
+    (book_dir / "chapter1.mp3").write_text("audio-data", encoding="utf-8")
+
+    destination = tmp_path / "sorted"
+    record = AudiobookRecord(
+        title="The Final Empire",
+        series="Mistborn",
+        series_index=1,
+        author="Brandon Sanderson",
+        source_path=book_dir,
+    )
+
+    write_sorted([record], destination)
+
+    expected = destination / "Brandon Sanderson" / "Mistborn" / "Book 1 - The Final Empire"
+    assert (expected / "chapter1.mp3").read_text(encoding="utf-8") == "audio-data"
+
+
+def test_write_sorted_creates_metadata_when_missing_source(tmp_path: Path) -> None:
+    destination = tmp_path / "sorted"
+    record = AudiobookRecord(
+        title="",
+        series=None,
+        series_index=None,
+        author="",
+        source_path=None,
+    )
+
+    write_sorted([record], destination)
+
+    expected = destination / "Unknown Author" / "Untitled"
+    metadata = expected / "metadata.json"
+    assert metadata.exists()
+    assert '"title": ""' in metadata.read_text(encoding="utf-8")