halkyon/packages/halkyon_ui/test/widget/navigation_frame_test.dart

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:material_ui/material_ui.dart';

import '../support/test_app.dart';

/// Every Halkyon app's frame around its tabs: a rail with the app's icon
/// from medium windows on, a floating bar below, a tick on every choice.
void main() {
  /// A 1 × 1 PNG, the app's icon in these tests.
  final icon = MemoryImage(
    Uint8List.fromList(const [
      0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D, //
      0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
      0x08, 0x06, 0x00, 0x00, 0x00, 0x1F, 0x15, 0xC4, 0x89, 0x00, 0x00, 0x00,
      0x0B, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9C, 0x63, 0x60, 0x00, 0x02, 0x00,
      0x00, 0x05, 0x00, 0x01, 0x7A, 0x5E, 0xAB, 0x3F, 0x00, 0x00, 0x00, 0x00,
      0x49, 0x45, 0x4E, 0x44, 0xAE, 0x42, 0x60, 0x82,
    ]),
  );

  /// The frame in a window [width] wide, on tab [selected]; the tabs chosen
  /// go into [chosen].
  Future<void> show(
    WidgetTester tester, {
    required double width,
    required List<int> chosen,
    int selected = 1,
  }) async {
    tester.view.physicalSize = Size(width, 800);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    await tester.pumpWidget(
      testApp(
        NavigationFrame(
          appName: 'Halkyon Test',
          icon: icon,
          selectedIndex: selected,
          onSelected: chosen.add,
          destinations: const [
            (label: 'Home', icon: Icon(Icons.home), selectedIcon: null),
            (label: 'Maps', icon: Icon(Icons.map), selectedIcon: null),
            (label: 'Profile', icon: Icon(Icons.person), selectedIcon: null),
          ],
          child: const Scaffold(body: Text('The tab')),
        ),
      ),
    );
  }

  /// The ticks the platform was asked for while [act] ran.
  Future<List<Object?>> ticks(
    WidgetTester tester,
    Future<void> Function() act,
  ) async {
    final haptics = <Object?>[];
    tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.platform,
      (call) async {
        if (call.method == 'HapticFeedback.vibrate') {
          haptics.add(call.arguments);
        }
        return null;
      },
    );
    addTearDown(
      () => tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
        SystemChannels.platform,
        null,
      ),
    );
    await act();
    return haptics;
  }

  testWidgets('below medium windows, a bar floats above the foot', (
    tester,
  ) async {
    await show(tester, width: 400, chosen: []);

    expect(find.byType(FloatingNavigationBar), findsOneWidget);
    expect(find.byType(NavigationRail), findsNothing);
    expect(find.text('The tab'), findsOneWidget);
  });

  testWidgets("from medium windows on, a rail with the app's icon on top, "
      'which leads to the first tab', (tester) async {
    final chosen = <int>[];
    await show(tester, width: 800, chosen: chosen);

    expect(find.byType(NavigationRail), findsOneWidget);
    expect(find.byType(NavigationBar), findsNothing);
    expect(find.bySemanticsLabel('Halkyon Test'), findsOneWidget);

    await tester.tap(find.byTooltip('Home'));
    await tester.pump();
    expect(chosen, [0]);
  });

  testWidgets('every choice on the bar ticks, lightly', (tester) async {
    final chosen = <int>[];
    await show(tester, width: 400, chosen: chosen);
    final haptics = await ticks(tester, () async {
      await tester.tap(find.text('Profile'));
      await tester.pump();
    });

    expect(haptics, ['HapticFeedbackType.selectionClick']);
    expect(chosen, [2]);
  });

  testWidgets('every choice on the rail ticks, lightly', (tester) async {
    final chosen = <int>[];
    await show(tester, width: 800, chosen: chosen);
    final haptics = await ticks(tester, () async {
      await tester.tap(find.text('Maps'));
      await tester.pump();
    });

    expect(haptics, ['HapticFeedbackType.selectionClick']);
    expect(chosen, [1]);
  });

  testWidgets('the window crossing from compact to medium and back swaps '
      'the bar for the rail', (tester) async {
    await show(tester, width: 400, chosen: []);
    for (final width in const [800.0, 400.0]) {
      tester.view.physicalSize = Size(width, 800);
      await tester.pumpAndSettle();
    }

    expect(find.byType(FloatingNavigationBar), findsOneWidget);
    expect(find.text('The tab'), findsOneWidget);
  });

  testWidgets('the bar steps aside where a screen has a bar of its own, '
      "leaving the system's bar its room", (tester) async {
    tester.view.physicalSize = const Size(400, 800);
    tester.view.devicePixelRatio = 1;
    tester.view.padding = const FakeViewPadding(bottom: 24);
    addTearDown(tester.view.reset);
    await tester.pumpWidget(
      testApp(
        NavigationFrame(
          appName: 'Halkyon Test',
          icon: icon,
          selectedIndex: 0,
          onSelected: (_) {},
          hidesNavigationBar: true,
          destinations: const [
            (label: 'Home', icon: Icon(Icons.home), selectedIcon: null),
            (label: 'Maps', icon: Icon(Icons.map), selectedIcon: null),
          ],
          child: const Scaffold(body: Text('The tab')),
        ),
      ),
    );

    expect(find.byType(FloatingNavigationBar), findsNothing);
    expect(tester.getBottomLeft(find.byType(Scaffold).last).dy, 800 - 24);
  });
}