car-interface-android/test/shortcut_grid_test.dart

import 'package:cardash_launcher/core/theme/app_theme.dart';
import 'package:cardash_launcher/features/home/widgets/shortcut_grid.dart';
import 'package:cardash_launcher/features/home/widgets/shortcut_tile.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

List<ShortcutSpec> _specs(int count) {
  return List.generate(
    count,
    (index) => ShortcutSpec(
      title: 'App $index',
      subtitle: index < 5 ? 'Select app' : null,
      iconAsset: 'assets/icons/app-window.svg',
      assigned: true,
      onTap: () {},
      onLongPress: () {},
      longPressHint: 'remove from Home',
    ),
  );
}

Future<void> _pumpGrid(
  WidgetTester tester, {
  required Size size,
  required bool compact,
  int count = 16,
}) async {
  await tester.pumpWidget(
    MaterialApp(
      theme: AppTheme.light(),
      home: Scaffold(
        body: Center(
          child: SizedBox(
            width: size.width,
            height: size.height,
            child: ShortcutGrid(shortcuts: _specs(count), compact: compact),
          ),
        ),
      ),
    ),
  );
  await tester.pump();
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  testWidgets('16 buttons fit at 1280x800 without overflow', (tester) async {
    await _pumpGrid(tester, size: const Size(700, 610), compact: false);

    expect(tester.takeException(), isNull);
    expect(find.byType(ShortcutTile), findsNWidgets(16));
    final first = tester.widget<ShortcutTile>(find.byType(ShortcutTile).first);
    expect(first.size, lessThanOrEqualTo(196));
    expect(first.size, greaterThan(64));
  });

  testWidgets('16 buttons fit at the 1280x720 layout', (tester) async {
    await _pumpGrid(tester, size: const Size(755, 500), compact: false);

    expect(tester.takeException(), isNull);
    expect(find.byType(ShortcutTile), findsNWidgets(16));
    final first = tester.widget<ShortcutTile>(find.byType(ShortcutTile).first);
    expect(first.size, lessThanOrEqualTo(196));
    expect(first.size, greaterThan(64));
  });

  testWidgets('16 buttons fit at the 1024x600 compact layout', (tester) async {
    await _pumpGrid(tester, size: const Size(559, 476), compact: true);

    expect(tester.takeException(), isNull);
    expect(find.byType(ShortcutTile), findsNWidgets(16));
    final first = tester.widget<ShortcutTile>(find.byType(ShortcutTile).first);
    expect(first.size, lessThanOrEqualTo(168));
    expect(first.size, greaterThan(64));
  });

  testWidgets('a short grid is anchored to the bottom edge', (tester) async {
    await _pumpGrid(
      tester,
      size: const Size(600, 400),
      compact: false,
      count: 4,
    );

    expect(tester.takeException(), isNull);
    final grid = tester.getRect(find.byType(ShortcutGrid));
    final wrap = tester.getRect(find.byType(Wrap));
    final last = tester.getRect(find.byType(ShortcutTile).last);

    expect(last.bottom, moreOrLessEquals(grid.bottom, epsilon: 0.5));
    expect(wrap.center.dx, moreOrLessEquals(grid.center.dx, epsilon: 0.5));
  });
}