Genre cleanup tools

tests/run-tests.js

@@ -9,6 +9,11 @@ import {
 	getWatchlistLabelsForTarget
 } from '../src/lib/constants.js';
 import { normalizeLookupItem, rankRecommendationResults } from '../src/lib/collection-tools.js';
+import {
+	buildSingleGenreUpdate,
+	normalizeGenreNames,
+	pickSuggestedGenre
+} from '../src/lib/genre-cleanup.js';
 import * as embyUserCache from '../src/lib/server/emby-user-cache.js';
 
 const tests = [];
@@ -280,6 +285,44 @@ test('normalizeLookupItem preserves already-normalized recommendation items', ()
 	});
 });
 
+test('normalizeGenreNames trims and deduplicates genre labels', () => {
+	assert.deepEqual(
+		normalizeGenreNames([' Drama ', 'Comedy', 'drama', '', null, 'Comedy ']),
+		['Drama', 'Comedy']
+	);
+});
+
+test('pickSuggestedGenre prefers an existing Emby genre if TMDB also includes it', () => {
+	assert.equal(
+		pickSuggestedGenre(['Action', 'Drama', 'Thriller'], ['Drama', 'Crime']),
+		'Drama'
+	);
+});
+
+test('pickSuggestedGenre falls back to the first TMDB genre when there is no overlap', () => {
+	assert.equal(
+		pickSuggestedGenre(['Action', 'Adventure'], ['Comedy']),
+		'Action'
+	);
+});
+
+test('buildSingleGenreUpdate keeps only the selected genre in both genre fields', () => {
+	const updated = buildSingleGenreUpdate(
+		{
+			Name: 'Example',
+			Genres: ['Drama', 'Crime'],
+			GenreItems: [
+				{ Name: 'Drama', Id: 62 },
+				{ Name: 'Crime', Id: 4910 }
+			]
+		},
+		'Crime'
+	);
+
+	assert.deepEqual(updated.Genres, ['Crime']);
+	assert.deepEqual(updated.GenreItems, [{ Name: 'Crime', Id: 4910 }]);
+});
+
 test('recommendation ranking deduplicates and prioritizes overlaps across seeds', () => {
 	const ranked = rankRecommendationResults(
 		['seed-a', 'seed-b'],