Client/test/view/ticker/ticker_scaffold_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:marianum_mobile/api/marianumconnect/queries/get_ticker_nav/get_ticker_nav_response.dart';
import 'package:marianum_mobile/api/marianumconnect/queries/get_ticker_page/get_ticker_page_response.dart';
import 'package:marianum_mobile/view/pages/ticker/ticker_view.dart';

List<TickerNavSection> _sections() => [
  TickerNavSection(
    title: 'Infos',
    pages: [
      TickerNavPage(title: 'Über uns', slug: 'about', kind: TickerPageKind.content),
      TickerNavPage(
        title: 'Webseite',
        slug: 'web',
        kind: TickerPageKind.redirect,
        externalUrl: 'https://marianum-fulda.de',
      ),
    ],
  ),
];

Widget _host() => MaterialApp(
  home: TickerScaffold(
    sections: _sections(),
    homeBuilder: (context, onLinkTap) => const Text('HOME'),
    pageBuilder: (context, slug, onLinkTap) => Text('PAGE:$slug'),
  ),
);

Finder _appBarText(String text) =>
    find.descendant(of: find.byType(AppBar), matching: find.text(text));

// The home surface stays mounted (IndexedStack) while a page is open, so
// "which content is shown" is the stack index, not widget presence.
int _shownIndex(WidgetTester tester) =>
    tester.widget<IndexedStack>(find.byType(IndexedStack)).index!;

const String _menuTooltip = 'Open navigation menu';

void main() {
  group('narrow layout (< 900)', () {
    testWidgets('uses a drawer reachable via the burger button', (tester) async {
      await tester.pumpWidget(_host());
      await tester.pumpAndSettle();

      // Nav is hidden behind the drawer, not shown as a sidebar.
      expect(find.text('Über uns'), findsNothing);
      expect(find.byTooltip(_menuTooltip), findsOneWidget);

      await tester.tap(find.byTooltip(_menuTooltip));
      await tester.pumpAndSettle();

      expect(find.byType(Drawer), findsOneWidget);
      expect(find.text('Über uns'), findsOneWidget);
      expect(find.text('Aktuelles'), findsOneWidget);
    });
  });

  group('wide layout (>= 900)', () {
    Future<void> pumpWide(WidgetTester tester) async {
      tester.view.physicalSize = const Size(1200, 2000);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);
      await tester.pumpWidget(_host());
      await tester.pumpAndSettle();
    }

    testWidgets('shows a permanent sidebar and no drawer', (tester) async {
      await pumpWide(tester);

      expect(find.byType(Drawer), findsNothing);
      expect(find.byTooltip(_menuTooltip), findsNothing);
      // Sidebar nav item is visible without any interaction.
      expect(find.text('Über uns'), findsOneWidget);
    });

    testWidgets('selecting a page swaps content, title and home action', (
      tester,
    ) async {
      await pumpWide(tester);

      expect(_shownIndex(tester), 0);
      expect(find.text('PAGE:about'), findsNothing);
      expect(_appBarText('Ticker'), findsOneWidget);
      expect(find.byIcon(Icons.home_outlined), findsNothing);

      await tester.tap(find.text('Über uns'));
      await tester.pumpAndSettle();

      expect(_shownIndex(tester), 1);
      expect(find.text('PAGE:about'), findsOneWidget);
      expect(_appBarText('Über uns'), findsOneWidget);
      expect(find.byIcon(Icons.home_outlined), findsOneWidget);

      await tester.tap(find.byIcon(Icons.home_outlined));
      await tester.pumpAndSettle();

      expect(_shownIndex(tester), 0);
      expect(find.text('PAGE:about'), findsNothing);
      expect(_appBarText('Ticker'), findsOneWidget);
      expect(find.byIcon(Icons.home_outlined), findsNothing);
    });
  });

  group('back gesture', () {
    testWidgets('pops from a sub-page back to home via the tab navigator', (
      tester,
    ) async {
      tester.view.physicalSize = const Size(1200, 2000);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);
      await tester.pumpWidget(_host());
      await tester.pumpAndSettle();

      await tester.tap(find.text('Über uns'));
      await tester.pumpAndSettle();
      expect(_shownIndex(tester), 1);

      final navigator = tester.state<NavigatorState>(find.byType(Navigator));
      // The LocalHistoryEntry is what makes the enclosing tab shell delegate
      // the system back to this navigator instead of switching tabs.
      expect(navigator.canPop(), isTrue);

      await navigator.maybePop();
      await tester.pumpAndSettle();

      expect(_shownIndex(tester), 0);
      expect(_appBarText('Ticker'), findsOneWidget);
      expect(navigator.canPop(), isFalse);
    });

    testWidgets('home selection releases the back interception', (
      tester,
    ) async {
      tester.view.physicalSize = const Size(1200, 2000);
      tester.view.devicePixelRatio = 1.0;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);
      await tester.pumpWidget(_host());
      await tester.pumpAndSettle();

      await tester.tap(find.text('Über uns'));
      await tester.pumpAndSettle();
      await tester.tap(find.byIcon(Icons.home_outlined));
      await tester.pumpAndSettle();

      final navigator = tester.state<NavigatorState>(find.byType(Navigator));
      expect(navigator.canPop(), isFalse);
    });
  });
}