new plus button

test/backup_format_test.dart

@@ -4,7 +4,7 @@ import 'package:receipity/services/backup_format.dart';
 void main() {
   test('round-trips a backup document', () {
     const original = BackupDocument(
-      version: 2,
+      version: 3,
       exportedAt: '2026-08-29T12:00:00.000',
       darkMode: true,
       supermarkets: [
@@ -29,6 +29,7 @@ void main() {
         {
           'id': 8,
           'supermarket': 'Jumbo',
+          'name': 'Weekly shop',
           'shopped_at': '2026-08-29T12:00:00.000',
           'receipt_image_path': 'receipts/shop_8.jpg',
           'total': 1.5,
@@ -46,6 +47,9 @@ void main() {
           'unit_price': 1.5,
         },
       ],
+      shopTags: [
+        {'id': 1, 'shop_id': 8, 'tag': 'weekly', 'normalized_tag': 'weekly'},
+      ],
       shoppingLists: [
         {
           'id': 1,
@@ -71,7 +75,9 @@ void main() {
     expect(parsed.darkMode, isTrue);
     expect(parsed.products.single['name'], 'Milk');
     expect(parsed.shops.single['id'], 8);
+    expect(parsed.shops.single['name'], 'Weekly shop');
     expect(parsed.shopItems.single['product_id'], 1);
+    expect(parsed.shopTags.single['tag'], 'weekly');
     expect(parsed.shoppingLists.single['name'], 'Weekly');
     expect(parsed.shoppingListItems.single['name'], 'Milk');
     expect(parsed.images['products/product_1.jpg'], 'abc123');
@@ -95,6 +101,7 @@ void main() {
     expect(parsed.version, 1);
     expect(parsed.shoppingLists, isEmpty);
     expect(parsed.shoppingListItems, isEmpty);
+    expect(parsed.shopTags, isEmpty);
   });
 
   test('rejects a file that is not a Receipity backup', () {

test/shop_log_test.dart

@@ -0,0 +1,96 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:receipity/models/shop.dart';
+import 'package:receipity/utils/shop_calendar.dart';
+import 'package:receipity/utils/shop_log_filter.dart';
+
+Shop _shop({
+  required int id,
+  required DateTime at,
+  String supermarket = 'Jumbo',
+  String? name,
+  List<String> tags = const [],
+}) {
+  return Shop(
+    id: id,
+    supermarket: supermarket,
+    name: name,
+    shoppedAt: at,
+    total: 10,
+    itemCount: 1,
+    tags: tags,
+  );
+}
+
+void main() {
+  group('monthGrid', () {
+    test('pads August 2026 from Saturday with Monday-first weeks', () {
+      final cells = monthGrid(DateTime(2026, 8));
+      expect(cells.length % 7, 0);
+      expect(cells[0], isNull);
+      expect(cells[1], isNull);
+      expect(cells[2], isNull);
+      expect(cells[3], isNull);
+      expect(cells[4], isNull);
+      expect(cells[5], DateTime(2026, 8, 1));
+      expect(cells[35], DateTime(2026, 8, 31));
+      expect(cells.last, isNull);
+    });
+  });
+
+  test('tripCountsByDay groups multiple trips on the same day', () {
+    final counts = tripCountsByDay([
+      DateTime(2026, 8, 12, 9),
+      DateTime(2026, 8, 12, 18),
+      DateTime(2026, 8, 13),
+    ]);
+    expect(counts[DateTime(2026, 8, 12)], 2);
+    expect(counts[DateTime(2026, 8, 13)], 1);
+    expect(heatmapLevel(0), 0);
+    expect(heatmapLevel(1), 1);
+    expect(heatmapLevel(4), 4);
+    expect(heatmapLevel(9), 4);
+  });
+
+  group('filterShops', () {
+    final shops = [
+      _shop(id: 1, at: DateTime(2026, 8, 12), tags: const ['weekly']),
+      _shop(
+        id: 2,
+        at: DateTime(2026, 8, 13),
+        name: 'Work lunch',
+        tags: const ['work'],
+      ),
+    ];
+    const names = {
+      1: ['Milk', 'Bread'],
+      2: ['Coffee'],
+    };
+
+    test('filters by product name', () {
+      final found = filterShops(
+        shops: shops,
+        productNames: names,
+        query: 'milk',
+      );
+      expect(found.map((shop) => shop.id), [1]);
+    });
+
+    test('filters by selected day', () {
+      final found = filterShops(
+        shops: shops,
+        productNames: names,
+        selectedDay: DateTime(2026, 8, 13),
+      );
+      expect(found.single.id, 2);
+    });
+
+    test('filters by tag', () {
+      final found = filterShops(
+        shops: shops,
+        productNames: names,
+        tag: 'weekly',
+      );
+      expect(found.single.id, 1);
+    });
+  });
+}

test/widget_test.dart

@@ -4,6 +4,7 @@ import 'package:receipity/main.dart';
 import 'package:receipity/models/line_item.dart';
 import 'package:receipity/review_screen.dart';
 import 'package:receipity/services/product_repository.dart';
+import 'package:receipity/widgets/shop_heatmap.dart';
 
 void main() {
   testWidgets('scan screen shows capture actions and bottom navigation', (
@@ -22,10 +23,41 @@ void main() {
     );
     expect(find.text('Products'), findsOneWidget);
     expect(find.text('Lists'), findsOneWidget);
-    expect(find.text('Add'), findsOneWidget);
+    expect(find.byTooltip('Add'), findsOneWidget);
+    expect(find.byIcon(Icons.add), findsOneWidget);
     expect(find.text('Shop log'), findsOneWidget);
   });
 
+  testWidgets('shop log has product search', (tester) async {
+    await tester.pumpWidget(ReceipityApp());
+    await tester.tap(find.text('Shop log'));
+    await tester.pump();
+    expect(find.byTooltip('Search products'), findsOneWidget);
+  });
+
+  testWidgets('shop heatmap renders the visible month', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: ShopHeatmap(
+            month: DateTime(2026, 8),
+            counts: const {},
+            monthTotal: 0,
+            monthTripCount: 0,
+            canGoForward: false,
+            onPreviousMonth: () {},
+            onNextMonth: () {},
+            onSelectDay: (_) {},
+          ),
+        ),
+      ),
+    );
+    expect(find.text('August 2026'), findsOneWidget);
+    expect(find.text('No trips this month'), findsOneWidget);
+    expect(find.text('Less'), findsOneWidget);
+    expect(find.text('More'), findsOneWidget);
+  });
+
   testWidgets('enter manually opens a blank trip', (tester) async {
     await tester.pumpWidget(ReceipityApp());
     await tester.tap(find.text('Enter manually'));
@@ -60,6 +92,8 @@ void main() {
     expect(find.text('Add item'), findsOneWidget);
     expect(find.textContaining('Save trip'), findsOneWidget);
     expect(find.text('Supermarket'), findsOneWidget);
+    expect(find.text('Trip name'), findsOneWidget);
+    expect(find.text('Add tag'), findsOneWidget);
 
     await tester.drag(find.text('Milk'), const Offset(-500, 0));
     await tester.pumpAndSettle();