Temporary setup of alternative to advertisements

test/ad_placeholder_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:fuel_tax_tracker/widgets/ad_placeholder_screen.dart';
+
+void main() {
+  /// Pushes the placeholder onto a real navigator so its self-dismissal
+  /// (which pops its own route) has something to pop.
+  ///
+  /// Deliberately avoids [WidgetTester.pumpAndSettle] while the
+  /// auto-dismiss ticker is alive — that timer reschedules a frame every
+  /// second, so settling would spin until it timed out rather than
+  /// returning.
+  Future<void> pushPlaceholder(WidgetTester tester, {required bool mustConfirm}) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Builder(
+          builder: (context) => TextButton(
+            onPressed: () => Navigator.of(context).push(
+              MaterialPageRoute<void>(
+                builder: (_) => AdPlaceholderScreen(mustConfirm: mustConfirm),
+              ),
+            ),
+            child: const Text('open'),
+          ),
+        ),
+      ),
+    );
+    await tester.tap(find.text('open'));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 400));
+  }
+
+  group('auto-dismissing placeholder (report + fuel-save interstitials)', () {
+    testWidgets('shows the logo and the future-ad message, with no Continue button',
+        (tester) async {
+      await pushPlaceholder(tester, mustConfirm: false);
+
+      expect(find.text('ADVERTISEMENT'), findsOneWidget);
+      expect(find.byType(Image), findsOneWidget, reason: 'the app logo');
+      expect(find.text('An advertisement will appear here'), findsOneWidget);
+      expect(find.textContaining('Ads are not running yet'), findsOneWidget);
+      expect(find.text('Continue'), findsNothing,
+          reason: 'only the sync gate waits on the user');
+
+      // Let it close so the ticker is cancelled before the test ends.
+      await tester.pump(const Duration(seconds: 4));
+      await tester.pumpAndSettle();
+    });
+
+    testWidgets('counts down and closes itself after four seconds', (tester) async {
+      await pushPlaceholder(tester, mustConfirm: false);
+
+      expect(find.textContaining('Closing in'), findsOneWidget);
+
+      await tester.pump(const Duration(seconds: 3));
+      expect(find.text('ADVERTISEMENT'), findsOneWidget,
+          reason: 'still up three seconds in');
+
+      await tester.pump(const Duration(seconds: 1));
+      await tester.pumpAndSettle();
+      expect(find.text('ADVERTISEMENT'), findsNothing, reason: 'closed itself');
+      expect(find.text('open'), findsOneWidget, reason: 'back on the page underneath');
+    });
+  });
+
+  group('confirming placeholder (the cloud-sync gate)', () {
+    testWidgets('waits for Continue instead of closing on its own', (tester) async {
+      await pushPlaceholder(tester, mustConfirm: true);
+
+      expect(find.text('Continue'), findsOneWidget);
+      expect(find.textContaining('Closing in'), findsNothing,
+          reason: 'nothing counts down — the upload waits on the user');
+
+      await tester.pump(const Duration(seconds: 10));
+      expect(find.text('ADVERTISEMENT'), findsOneWidget,
+          reason: 'still up well past the auto-dismiss window');
+
+      await tester.tap(find.text('Continue'));
+      await tester.pumpAndSettle();
+      expect(find.text('ADVERTISEMENT'), findsNothing);
+      expect(find.text('open'), findsOneWidget);
+    });
+  });
+}