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test/receipt_parser_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:fuel_tax_tracker/services/receipt_parser.dart';
+
+void main() {
+  group('ReceiptParser', () {
+    test('parses a typical gas station receipt', () {
+      const receipt = '''
+        SHELL OIL 12345
+        123 MAIN ST
+        PUMP 04
+        GALLONS       12.345
+        PRICE/GAL     \$3.599
+        FUEL TOTAL    \$44.44
+        THANK YOU
+      ''';
+
+      final result = ReceiptParser.parse(receipt);
+
+      expect(result.gallons, 12.345);
+      expect(result.pricePerGallon, 3.599);
+      expect(result.totalCost, 44.44);
+    });
+
+    test('does not confuse SUBTOTAL with TOTAL', () {
+      const receipt = '''
+        SUBTOTAL 10.00
+        TAX 0.50
+        TOTAL 10.50
+      ''';
+
+      final result = ReceiptParser.parse(receipt);
+
+      expect(result.totalCost, 10.50);
+    });
+
+    test('derives total when gallons and price per gallon are known', () {
+      const receipt = '''
+        GALLONS 10.000
+        PPG 3.500
+      ''';
+
+      final result = ReceiptParser.parse(receipt);
+
+      expect(result.gallons, 10.0);
+      expect(result.pricePerGallon, 3.5);
+      expect(result.totalCost, 35.0);
+    });
+
+    test('derives gallons when total and price per gallon are known', () {
+      const receipt = '''
+        PRICE PER GALLON \$4.000
+        TOTAL \$20.00
+      ''';
+
+      final result = ReceiptParser.parse(receipt);
+
+      expect(result.pricePerGallon, 4.0);
+      expect(result.totalCost, 20.0);
+      expect(result.gallons, 5.0);
+    });
+
+    test('returns nulls when nothing recognizable is present', () {
+      const receipt = 'THANK YOU FOR YOUR PURCHASE';
+
+      final result = ReceiptParser.parse(receipt);
+
+      expect(result.gallons, isNull);
+      expect(result.pricePerGallon, isNull);
+      expect(result.totalCost, isNull);
+    });
+  });
+}

test/widget_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+
+import 'package:fuel_tax_tracker/screens/home_screen.dart';
+import 'package:fuel_tax_tracker/services/app_state.dart';
+
+void main() {
+  testWidgets('Shows empty state and add-vehicle action when there are no vehicles',
+      (WidgetTester tester) async {
+    final appState = AppState()..isLoading = false;
+
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: appState,
+        child: const MaterialApp(home: HomeScreen()),
+      ),
+    );
+
+    expect(find.text('My Vehicles'), findsOneWidget);
+    expect(find.text('Add Vehicle'), findsOneWidget);
+    expect(find.textContaining('No vehicles yet'), findsOneWidget);
+  });
+}