nice overview working

test/widget_test.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:myapp/main.dart';
 import 'package:myapp/models/bank.dart';
@@ -51,13 +52,62 @@ void main() {
       'pending': false,
     });
     expect(tx.descriptionKey, contains('pasvolgnr'));
-    expect(tx.merchantKey, contains('ah campus diemen'));
+    expect(tx.merchantKey, 'ah campus');
     expect(tx.merchantKey.contains('pasvolgnr'), isFalse);
     expect(tx.exactKey, contains('-3.5'));
     expect(formatMoney(tx.amount, tx.currency), contains('EUR'));
     expect(kBuiltinLabels.first.name, 'Groceries');
   });
 
+  test('merchant stems group Albert Heijn / AH across stores', () {
+    final a = merchantKeyFromDescription('Albert Heijn 1562 Utrecht NLD');
+    final b = merchantKeyFromDescription('ALBERT HEIJN 1847 AMSTERDAM');
+    final c = merchantKeyFromDescription(
+      'BCK*AH CAMPUS DIEMEN ZUID NLD Pasvolgnr: 001 Transactie: X',
+    );
+    final d = merchantKeyFromDescription('AH CAMPUS AMSTERDAM NLD');
+    expect(a, 'albert heijn');
+    expect(b, 'albert heijn');
+    expect(c, 'ah campus');
+    expect(d, 'ah campus');
+    expect(descriptionMatchesPattern('Albert Heijn 1562 Utrecht', a), isTrue);
+    expect(
+      descriptionMatchesPattern('Jumbo City Centrum', a),
+      isFalse,
+    );
+    expect(
+      descriptionMatchesPattern('AH CAMPUS DIEMEN', '/ah campus/'),
+      isTrue,
+    );
+  });
+
+  test('flattenLabelTree indents children under parents', () {
+    const parent = TxLabel(
+      id: 'groceries',
+      name: 'Groceries',
+      color: Color(0xFF16A34A),
+    );
+    const child = TxLabel(
+      id: 'custom_ah',
+      name: 'Albert Heijn',
+      color: Color(0xFF0F766E),
+      custom: true,
+      parentId: 'groceries',
+    );
+    const other = TxLabel(
+      id: 'dining',
+      name: 'Dining',
+      color: Color(0xFFEA580C),
+    );
+    final tree = flattenLabelTree([child, other, parent]);
+    expect(tree.map((e) => e.label.id).toList(), [
+      'dining',
+      'groceries',
+      'custom_ah',
+    ]);
+    expect(tree.map((e) => e.depth).toList(), [0, 0, 1]);
+  });
+
   test('look-ahead applies monthly recurring amounts', () {
     final items = [
       const RecurringItem(