A whole lot of stuff

test/report_vehicle_selection_test.dart

@@ -7,9 +7,11 @@ import 'package:fuel_tax_tracker/models/vehicle.dart';
 import 'package:fuel_tax_tracker/screens/report_screen.dart';
 import 'package:fuel_tax_tracker/services/app_state.dart';
 
-/// Covers the per-vehicle selection cards on the Reports tab: once a date
-/// range is picked, every vehicle with a receipted entry in range starts
-/// selected (colored like the "Share" button), tapping one to deselect it
+/// Covers the per-vehicle selection cards on the Reports tab: with a date
+/// range in place (now defaulted automatically — see
+/// defaultReportDateRange/ReportScreen.initState), every vehicle with a
+/// receipted entry in range starts selected (colored like the "Share"
+/// button), tapping one to deselect it
 /// drops it from the total (and, by extension, the generated report) and
 /// reverts its coloring to a plain unselected card, and deselecting every
 /// vehicle shows a distinct "nothing selected" message rather than "no
@@ -19,10 +21,10 @@ void main() {
   final vehicleA = Vehicle(id: 'a', vin: 'VINAAAAAAAAAAAAAA', nickname: 'Truck', updatedAt: DateTime.utc(2026, 1, 1));
   final vehicleB = Vehicle(id: 'b', vin: 'VINBBBBBBBBBBBBBB', nickname: 'Van', updatedAt: DateTime.utc(2026, 1, 1));
 
-  // showDatePicker's initial date (when none is set yet) defaults to
-  // "now" — dating these entries to "now" too, rather than a fixed date,
-  // means just accepting that default on both pickers (below) already
-  // covers them, without needing to drive the calendar UI to a specific day.
+  // ReportScreen's date range now defaults to the current fuel-tax-refund
+  // period (see defaultReportDateRange) as soon as it opens — dating these
+  // entries to "now" means they always fall inside that default range,
+  // without these tests needing to drive the date pickers themselves.
   final now = DateTime.now();
 
   FuelEntry entryFor(String vehicleId, String id, double gallons, double cost) => FuelEntry(
@@ -36,26 +38,15 @@ void main() {
         receiptDriveFileId: 'remote-$id',
       );
 
-  Future<void> pickRange(WidgetTester tester) async {
-    await tester.tap(find.text('Start date'));
-    await tester.pumpAndSettle();
-    await tester.tap(find.text('OK'));
-    await tester.pumpAndSettle();
-
-    await tester.tap(find.text('End date'));
-    await tester.pumpAndSettle();
-    await tester.tap(find.text('OK'));
-    await tester.pumpAndSettle();
-  }
-
-  Future<AppState> pumpReport(WidgetTester tester) async {
+  Future<AppState> pumpReport(WidgetTester tester, {bool showEstimatedFuelRefund = false}) async {
     final appState = AppState()
       ..isLoading = false
       ..vehicles = [vehicleA, vehicleB]
       ..fuelEntries = [
         entryFor('a', 'e1', 10, 35),
         entryFor('b', 'e2', 20, 70),
-      ];
+      ]
+      ..showEstimatedFuelRefund = showEstimatedFuelRefund;
 
     await tester.pumpWidget(
       ChangeNotifierProvider.value(
@@ -73,7 +64,6 @@ void main() {
   testWidgets('both vehicles start colored as selected once a range with entries for both is picked',
       (tester) async {
     await pumpReport(tester);
-    await pickRange(tester);
 
     final colorScheme = Theme.of(tester.element(find.text('Truck'))).colorScheme;
 
@@ -82,10 +72,28 @@ void main() {
     expect(find.text('30.000 gal · \$105.00'), findsOneWidget, reason: 'combined total');
   });
 
+  testWidgets(
+      'shows an estimated fuel refund below each vehicle\'s total cost and next to the '
+      'combined total, when the setting is on', (tester) async {
+    await pumpReport(tester, showEstimatedFuelRefund: true);
+
+    // Truck: 10 gal * $0.125/gal = $1.25. Van: 20 gal * $0.125/gal = $2.50.
+    expect(find.text('Est. \$1.25'), findsOneWidget);
+    expect(find.text('Est. \$2.50'), findsOneWidget);
+    // Combined: 30 gal * $0.125/gal = $3.75, folded into the Total row.
+    expect(find.text('30.000 gal · \$105.00 · Est. \$3.75'), findsOneWidget);
+  });
+
+  testWidgets('shows no estimated fuel refund anywhere when the setting is off (default)',
+      (tester) async {
+    await pumpReport(tester);
+
+    expect(find.textContaining('Est. \$'), findsNothing);
+  });
+
   testWidgets('tapping a selected vehicle deselects it (reverts its coloring) and drops it from the total',
       (tester) async {
     await pumpReport(tester);
-    await pickRange(tester);
 
     final colorScheme = Theme.of(tester.element(find.text('Truck'))).colorScheme;
 
@@ -100,7 +108,6 @@ void main() {
   testWidgets('tapping a deselected vehicle again reselects it (restores its coloring)',
       (tester) async {
     await pumpReport(tester);
-    await pickRange(tester);
 
     final colorScheme = Theme.of(tester.element(find.text('Truck'))).colorScheme;
 
@@ -113,10 +120,24 @@ void main() {
     expect(find.text('30.000 gal · \$105.00'), findsOneWidget, reason: 'both counted again');
   });
 
+  testWidgets('tapping Preview opens the report preview screen', (tester) async {
+    await pumpReport(tester);
+
+    await tester.scrollUntilVisible(find.text('Preview'), 300, scrollable: find.byType(Scrollable));
+    await tester.tap(find.text('Preview'));
+    // Not pumpAndSettle: PdfPreview's own internal rendering isn't under
+    // test here (no platform channel mocked for it) — just that Preview
+    // actually navigates. A couple of bounded pumps are enough for that
+    // navigation (a synchronous PDF build, no plugin calls) to land.
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 300));
+
+    expect(find.text('Report Preview'), findsOneWidget);
+  });
+
   testWidgets('deselecting every vehicle shows a distinct "nothing selected" message',
       (tester) async {
     await pumpReport(tester);
-    await pickRange(tester);
 
     await tester.tap(find.text('Truck'));
     await tester.pumpAndSettle();
@@ -127,6 +148,7 @@ void main() {
       find.text('No vehicles selected — tap at least one above to build a report.'),
       findsOneWidget,
     );
+    expect(find.text('Preview'), findsNothing);
     expect(find.text('Share'), findsNothing);
     expect(find.text('Print'), findsNothing);
     // The cards themselves stay visible so the user can tap one again.