A whole bunch of changes

test/receipt_detail_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/fuel_entry.dart';
+import 'package:fuel_tax_tracker/models/vehicle.dart';
+import 'package:fuel_tax_tracker/screens/edit_fuel_entry_screen.dart';
+import 'package:fuel_tax_tracker/screens/receipt_detail_screen.dart';
+import 'package:fuel_tax_tracker/screens/receipt_image_screen.dart';
+import 'package:fuel_tax_tracker/services/app_state.dart';
+
+/// Covers [ReceiptDetailScreen] itself — the single place to view a
+/// receipt's photo and logged data together, with edit/delete for the
+/// entry. Deliberately never taps through to an actual delete: that would
+/// call [AppState.deleteFuelEntry], which needs an initialized database not
+/// set up here (see settings_purge_test.dart for the same convention).
+void main() {
+  final vehicle = Vehicle(id: 'v1', vin: '1FMPU18L1TLB51349', nickname: 'Red Truck', updatedAt: DateTime.utc(2026, 1, 1));
+  final entry = FuelEntry(
+    id: 'e1',
+    vehicleId: 'v1',
+    date: DateTime(2026, 5, 14, 9, 30),
+    gallons: 10.523,
+    pricePerGallon: 3.499,
+    totalCost: 36.81,
+    updatedAt: DateTime.utc(2026, 5, 14),
+    receiptDriveFileId: 'remote-1',
+  );
+
+  Future<void> pumpDetail(WidgetTester tester, AppState appState) async {
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: appState,
+        child: MaterialApp(home: ReceiptDetailScreen(entryId: 'e1')),
+      ),
+    );
+  }
+
+  testWidgets('shows the vehicle, date, gallons, price, and total', (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [vehicle]
+      ..fuelEntries = [entry];
+
+    await pumpDetail(tester, appState);
+
+    expect(find.text('Red Truck'), findsOneWidget);
+    expect(find.text('VIN: 1FMPU18L1TLB51349'), findsOneWidget);
+    expect(find.text('10.523 gal'), findsOneWidget);
+    expect(find.text('\$3.50'), findsOneWidget, reason: 'price per gallon');
+    expect(find.text('\$36.81'), findsOneWidget, reason: 'total cost');
+  });
+
+  testWidgets('shows a fallback instead of crashing when the entry no longer exists',
+      (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [vehicle]
+      ..fuelEntries = [];
+
+    await pumpDetail(tester, appState);
+
+    expect(find.text('Receipt not found'), findsOneWidget);
+  });
+
+  testWidgets('the edit icon opens EditFuelEntryScreen pre-filled', (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [vehicle]
+      ..fuelEntries = [entry];
+
+    await pumpDetail(tester, appState);
+
+    await tester.tap(find.byTooltip('Edit fuel entry'));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(EditFuelEntryScreen), findsOneWidget);
+    expect(find.widgetWithText(TextFormField, '10.523'), findsOneWidget);
+  });
+
+  testWidgets('the delete icon shows a warning dialog; Cancel dismisses it without deleting',
+      (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [vehicle]
+      ..fuelEntries = [entry];
+
+    await pumpDetail(tester, appState);
+
+    await tester.tap(find.byTooltip('Delete fuel entry'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Delete fuel entry?'), findsOneWidget);
+
+    await tester.tap(find.text('Cancel'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Delete fuel entry?'), findsNothing);
+    expect(appState.fuelEntries, hasLength(1), reason: 'not deleted');
+  });
+
+  testWidgets('tapping the photo opens the full-screen viewer', (tester) async {
+    final appState = AppState()
+      ..isLoading = false
+      ..vehicles = [vehicle]
+      ..fuelEntries = [entry];
+
+    await pumpDetail(tester, appState);
+
+    await tester.tap(find.byType(GestureDetector).first);
+    await tester.pumpAndSettle();
+
+    expect(find.byType(ReceiptImageScreen), findsOneWidget);
+  });
+}