fix(metadata): find audiobook series through hardcover when audible leaves them untagged

tests/test_musicbrainz.py

@@ -82,3 +82,42 @@ def test_a_broken_fallback_never_breaks_the_search(monkeypatch):
     monkeypatch.setattr(metadata.musicbrainz, "search", boom)
     results = asyncio.run(metadata.audiobook_search("Toteninsel"))
     assert [r.title for r in results] == ["Da"]
+
+
+def test_audiobook_search_appends_hardcover_series_as_audiobooks(monkeypatch):
+    from wordarr.metadata.base import MetadataResult
+
+    async def fake_audible(query, language=""):
+        return [MetadataResult(media_type="audiobook", title="Die letzte Witwe")]
+
+    async def no_hits(query, language=""):
+        return []
+
+    async def fake_hardcover(query, language=""):
+        return [MetadataResult(media_type="ebook", source="hardcover",
+                               title="Die verstummte Frau", series="Will Trent",
+                               series_id="3670", volume=10)]
+
+    monkeypatch.setattr(metadata.audible, "search", fake_audible)
+    monkeypatch.setattr(metadata.musicbrainz, "search", no_hits)
+    monkeypatch.setattr(metadata.hardcover, "search", fake_hardcover)
+    results = asyncio.run(metadata.audiobook_search("Karin Slaughter", "german"))
+    assert [r.source for r in results] == ["audible", "hardcover"]
+    assert results[1].media_type == "audiobook"
+
+
+def test_audiobook_series_goes_to_the_provider_of_the_hit(monkeypatch):
+    from wordarr.metadata.base import MetadataResult
+
+    async def fake_series_books(series_id, language=""):
+        return [MetadataResult(media_type="ebook", source="hardcover",
+                               title="Triptych", volume=1)]
+
+    async def audible_must_not_run(series_id, title):
+        raise AssertionError("a hardcover id is no audible series asin")
+
+    monkeypatch.setattr(metadata.hardcover, "series_books", fake_series_books)
+    monkeypatch.setattr(metadata.audible, "series_episodes", audible_must_not_run)
+    lookup = metadata.SERIES_PROVIDERS["audiobook"]
+    books = asyncio.run(lookup("3670", "Will Trent", "german", "hardcover"))
+    assert [(b.title, b.media_type) for b in books] == [("Triptych", "audiobook")]