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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);
+  });
+}