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test/catalog_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:receipity/models/line_item.dart';
+
+import 'test_helpers.dart';
+
+void main() {
+  ensureTestSqlite();
+
+  test('deleting a product keeps the trip line and drops the catalog row',
+      () async {
+    final repository = memoryRepository();
+    final shopId = await repository.saveShop(
+      supermarket: 'Jumbo',
+      shoppedAt: DateTime(2026, 8, 12),
+      items: [LineItem(id: '1', name: 'Milk', price: 1.5)],
+    );
+
+    final products = await repository.getAll();
+    expect(products, hasLength(1));
+    await repository.deleteProduct(products.single.id);
+
+    expect(await repository.getAll(), isEmpty);
+    final items = await repository.getShopItems(shopId);
+    expect(items, hasLength(1));
+    expect(items.single.name, 'Milk');
+    expect(items.single.productId, isNull);
+  });
+
+  test('deleting all products leaves shopping trips in place', () async {
+    final repository = memoryRepository();
+    await repository.saveShop(
+      supermarket: 'Jumbo',
+      shoppedAt: DateTime(2026, 8, 12),
+      items: [
+        LineItem(id: '1', name: 'Milk', price: 1.5),
+        LineItem(id: '2', name: 'Bread', price: 2),
+      ],
+    );
+    await repository.deleteAllProducts();
+
+    expect(await repository.getAll(), isEmpty);
+    expect(await repository.getShops(), hasLength(1));
+    final overview = await repository.getOverview();
+    expect(overview.productCount, 0);
+    expect(overview.tripCount, 1);
+  });
+}