onedirve and google drive

test/add_edit_vehicle_screen_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/models/vehicle.dart';
+import 'package:fuel_tax_tracker/screens/add_edit_vehicle_screen.dart';
+import 'package:fuel_tax_tracker/screens/vehicle_detail_screen.dart';
+import 'package:fuel_tax_tracker/services/app_state.dart';
+
+/// Covers the "VIN already belongs to another vehicle" dialog on the Add
+/// Vehicle form — [AddEditVehicleScreen] driven directly against an
+/// [AppState] whose in-memory `vehicles` list is seeded by hand (no
+/// database/cloud wiring needed, since the dialog only reads
+/// [AppState.vehicleByVin]).
+void main() {
+  final existingVehicle = Vehicle(
+    id: 'existing-id',
+    vin: '1FMPU18L1TLB51349',
+    nickname: 'Red Truck',
+    updatedAt: DateTime.utc(2026, 1, 1),
+  );
+
+  Future<AppState> pumpAddVehicleScreen(WidgetTester tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [existingVehicle];
+
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: appState,
+        child: const MaterialApp(home: AddEditVehicleScreen()),
+      ),
+    );
+    return appState;
+  }
+
+  testWidgets('entering a VIN that already exists shows the dialog', (tester) async {
+    await pumpAddVehicleScreen(tester);
+
+    await tester.enterText(find.widgetWithText(TextFormField, 'VIN *'), existingVehicle.vin);
+    await tester.pumpAndSettle();
+
+    expect(find.text('Vehicle already exists'), findsOneWidget);
+    expect(
+      find.text(
+        'Vehicle with the VIN ${existingVehicle.vin} already exists, would you like to open that vehicle?',
+      ),
+      findsOneWidget,
+    );
+  });
+
+  testWidgets('tapping No dismisses the dialog and stays on the create screen', (tester) async {
+    await pumpAddVehicleScreen(tester);
+
+    await tester.enterText(find.widgetWithText(TextFormField, 'VIN *'), existingVehicle.vin);
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.widgetWithText(TextButton, 'No'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Vehicle already exists'), findsNothing);
+    expect(find.text('Add Vehicle'), findsWidgets);
+    expect(
+      find.text('A vehicle with VIN "${existingVehicle.vin}" already exists.'),
+      findsOneWidget,
+      reason: 'the field itself should be flagged invalid after declining to open the existing vehicle',
+    );
+  });
+
+  testWidgets('tapping Yes opens the existing vehicle', (tester) async {
+    await pumpAddVehicleScreen(tester);
+
+    await tester.enterText(find.widgetWithText(TextFormField, 'VIN *'), existingVehicle.vin);
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.widgetWithText(TextButton, 'Yes'));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(VehicleDetailScreen), findsOneWidget);
+    expect(find.text(existingVehicle.displayLabel), findsOneWidget);
+    expect(find.byType(AddEditVehicleScreen), findsNothing,
+        reason: 'the create screen should be popped, not left underneath');
+  });
+
+  testWidgets('editing a vehicle with its own VIN does not trigger the dialog', (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [existingVehicle];
+
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: appState,
+        child: MaterialApp(home: AddEditVehicleScreen(vehicle: existingVehicle)),
+      ),
+    );
+
+    // The field already starts pre-filled with its own VIN; nudge it to
+    // fire onChanged the same way a real edit would.
+    await tester.enterText(find.widgetWithText(TextFormField, 'VIN *'), existingVehicle.vin);
+    await tester.pumpAndSettle();
+
+    expect(find.text('Vehicle already exists'), findsNothing);
+  });
+}