add program files

tests/ingest/test_load_library.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+from audiobooksorter.ingest import IngestError, load_library
+
+
+def test_load_library_from_json(samples_dir: Path) -> None:
+    records = load_library(samples_dir / "library.json")
+
+    assert len(records) == 5
+    assert records[0].title == "The Final Empire"
+    assert records[0].source_path is None
+
+
+def test_load_library_from_directory(tmp_path: Path) -> None:
+    library = tmp_path / "library"
+    book_one = library / "Mistborn1"
+    book_two = library / "Wayfarers"
+    book_one.mkdir(parents=True)
+    book_two.mkdir(parents=True)
+
+    (book_one / "metadata.json").write_text(
+        json.dumps(
+            {"title": "The Final Empire", "series": "Mistborn", "seriesIndex": 1, "author": "Brandon"}
+        ),
+        encoding="utf-8",
+    )
+    (book_two / "metadata.json").write_text(
+        json.dumps({"title": "Wayfarers", "author": "Becky Chambers"}),
+        encoding="utf-8",
+    )
+
+    records = load_library(library)
+
+    sources = {record.title: record.source_path for record in records}
+    assert sources["The Final Empire"] == book_one
+    assert sources["Wayfarers"] == book_two
+
+
+def test_missing_library_raises(tmp_path: Path) -> None:
+    with pytest.raises(IngestError):
+        load_library(tmp_path / "missing")