added categories, import export, settings

test/supermarket_test.dart

@@ -0,0 +1,23 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:receipity/utils/supermarkets.dart';
+
+void main() {
+  test('detects Jumbo and Lidl from receipt text', () {
+    expect(detectSupermarket('Jumbo\nMelk 1,50'), 'Jumbo');
+    expect(
+      detectSupermarket('Dekamarkt\nMelk 1,50', names: ['Dekamarkt']),
+      'Dekamarkt',
+    );
+    expect(detectSupermarket('LIDL SUPERMARKT\nBananas 1.20'), 'Lidl');
+  });
+
+  test('detects Albert Heijn aliases', () {
+    expect(detectSupermarket('Albert Heijn\nKaas 2,00'), 'Albert Heijn');
+    expect(detectSupermarket('AH TO GO\nCoffee 1,80'), 'Albert Heijn');
+    expect(detectSupermarket('AH\nMilk 1.00'), 'Albert Heijn');
+  });
+
+  test('returns null when no supermarket is present', () {
+    expect(detectSupermarket('Milk 1.50\nBread 2.00'), isNull);
+  });
+}