feat(metadata): edit release tags and render UPC barcodes

test/models_and_utils_test.dart

@@ -1036,6 +1036,10 @@ void main() {
         'bitDepth': 24,
         'sampleRate': 96000,
         'bitrate': 1840,
+        'albumType': 'album',
+        'explicit': true,
+        'upc': '4006381333931',
+        'comment': 'https://listen.tidal.com/album/1',
         'format': 'flac',
       });
 
@@ -1051,6 +1055,10 @@ void main() {
       expect(normalized['bit_depth'], 24);
       expect(normalized['sample_rate'], 96000);
       expect(normalized['bitrate'], 1840);
+      expect(normalized['album_type'], 'album');
+      expect(normalized['explicit'], isTrue);
+      expect(normalized['upc'], '4006381333931');
+      expect(normalized['comment'], 'https://listen.tidal.com/album/1');
       expect(normalized['audio_codec'], 'flac');
     });
 

test/retail_barcode_test.dart

@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:spotiflac_android/utils/retail_barcode.dart';
+import 'package:spotiflac_android/widgets/metadata_barcode.dart';
+
+void main() {
+  test('encodes a valid UPC-A with its native retail symbology', () {
+    final barcode = encodeRetailBarcode('036000291452');
+
+    expect(barcode, isNotNull);
+    expect(barcode!.symbology, 'UPC-A');
+    expect(barcode.value, '036000291452');
+    expect(barcode.modules, hasLength(95));
+    expect(barcode.modules, startsWith('101'));
+    expect(barcode.modules, endsWith('101'));
+  });
+
+  test('encodes a valid EAN-13 with its native retail symbology', () {
+    final barcode = encodeRetailBarcode('4006381333931');
+
+    expect(barcode, isNotNull);
+    expect(barcode!.symbology, 'EAN-13');
+    expect(barcode.modules, hasLength(95));
+    expect(hasValidGtinCheckDigit(barcode.value), isTrue);
+  });
+
+  test('uses an exact scannable fallback for a malformed provider value', () {
+    final barcode = encodeRetailBarcode('0012345678901');
+
+    expect(barcode, isNotNull);
+    expect(barcode!.symbology, 'CODE 128');
+    expect(barcode.value, '0012345678901');
+    expect(barcode.modules, isNotEmpty);
+  });
+
+  test('normalizes separators but rejects non-numeric values', () {
+    expect(encodeRetailBarcode('0 36000-29145 2')?.value, '036000291452');
+    expect(encodeRetailBarcode('not-a-upc'), isNull);
+  });
+
+  testWidgets('metadata barcode stays usable in a narrow metadata card', (
+    tester,
+  ) async {
+    var copied = false;
+    await tester.pumpWidget(
+      MaterialApp(
+        theme: ThemeData(colorSchemeSeed: Colors.teal),
+        home: Scaffold(
+          body: Center(
+            child: SizedBox(
+              width: 260,
+              child: MetadataBarcode(
+                value: '036000291452',
+                label: 'UPC / Barcode',
+                onCopy: () => copied = true,
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(find.text('UPC-A'), findsOneWidget);
+    expect(find.text('036000291452'), findsOneWidget);
+    expect(tester.takeException(), isNull);
+
+    await tester.tap(find.byType(MetadataBarcode));
+    expect(copied, isTrue);
+  });
+}