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samples/experimental/material_3_demo/test/component_screen_test.dart

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// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// ignore_for_file: avoid_types_on_closure_parameters
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:material_3_demo/component_screen.dart';
import 'package:material_3_demo/main.dart';
void main() {
testWidgets('Default main page shows all M3 components', (tester) async {
widgetSetup(tester, 800, windowHeight: 3500);
await tester.pumpWidget(const Material3Demo());
// Elements on the app bar
expect(find.text('Material 3'), findsOneWidget);
expect(find.widgetWithIcon(IconButton, Icons.wb_sunny_outlined),
findsOneWidget);
expect(find.widgetWithIcon(IconButton, Icons.filter_3), findsOneWidget);
expect(find.widgetWithIcon(IconButton, Icons.more_vert), findsOneWidget);
// Elements on the component screen
// Buttons
expect(find.widgetWithText(ElevatedButton, 'Elevated'), findsNWidgets(2));
expect(find.widgetWithText(FilledButton, 'Filled'), findsNWidgets(2));
expect(find.widgetWithText(FilledButton, 'Filled Tonal'), findsNWidgets(2));
expect(find.widgetWithText(OutlinedButton, 'Outlined'), findsNWidgets(2));
expect(find.widgetWithText(TextButton, 'Text'), findsNWidgets(2));
expect(find.text('Icon'), findsNWidgets(5));
// IconButtons
expect(find.byType(IconToggleButton), findsNWidgets(8));
// FABs
expect(find.byType(FloatingActionButton), findsNWidgets(4));
expect(find.widgetWithText(FloatingActionButton, 'Create'), findsOneWidget);
// Chips
expect(find.byType(ActionChip),
findsNWidgets(7)); // includes Assist and Suggestion chip.
expect(find.byType(FilterChip), findsNWidgets(4));
expect(find.byType(InputChip), findsNWidgets(4));
// Cards
expect(find.widgetWithText(Card, 'Filled'), findsOneWidget);
expect(find.widgetWithText(Card, 'Filled'), findsOneWidget);
expect(find.widgetWithText(Card, 'Outlined'), findsOneWidget);
// TextFields
expect(find.widgetWithText(TextField, 'Disabled'), findsNWidgets(2));
expect(find.widgetWithText(TextField, 'Filled'), findsNWidgets(2));
expect(find.widgetWithText(TextField, 'Outlined'), findsNWidgets(2));
// Alert Dialog
Finder dialogExample = find.widgetWithText(TextButton, 'Open Dialog');
expect(dialogExample, findsOneWidget);
});
testWidgets(
'NavigationRail doesn\'t show when width value is small than 450 '
'(in Portrait mode or narrow screen)', (tester) async {
widgetSetup(tester, 449);
await tester.pumpWidget(const Material3Demo());
// When screen width is less than 450, NavigationBar will show. At the same
// time, the NavigationRail and the NavigationBar example will NOT show.
expect(find.byType(NavigationBars), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Components'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Color'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Typography'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Elevation'), findsOneWidget);
expect(find.byType(NavigationRailSection), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Explore'), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Pets'), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Account'), findsNothing);
});
testWidgets(
'NavigationRail shows when width value is greater than or equal '
'to 450 (in Landscape mode or wider screen)', (tester) async {
widgetSetup(tester, 450);
await tester.pumpWidget(const Material3Demo());
// When screen width is greater than or equal to 450, NavigationRail and
// NavigationBar example will show. At the same time, the NavigationBar
// will NOT show.
expect(find.byType(NavigationRailSection), findsOneWidget);
expect(find.byType(Tooltip, skipOffstage: false), findsWidgets);
expect(find.widgetWithText(NavigationRailSection, 'Components'),
findsOneWidget);
expect(find.widgetWithText(NavigationRailSection, 'Color'), findsOneWidget);
expect(find.widgetWithText(NavigationRailSection, 'Typography'),
findsOneWidget);
expect(find.widgetWithText(NavigationRailSection, 'Elevation'),
findsOneWidget);
final navbarExample = find.byType(NavigationBars);
await tester.scrollUntilVisible(
scrollable: find.byType(Scrollable).first,
navbarExample,
500.0,
);
expect(find.byType(NavigationBars), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Explore'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Pets'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Account'), findsOneWidget);
expect(find.widgetWithText(NavigationBar, 'Components'), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Colors'), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Typography'), findsNothing);
expect(find.widgetWithText(NavigationBar, 'Elevation'), findsNothing);
});
testWidgets(
'Material version switches between Material3 and Material2 when'
'the version icon is clicked', (tester) async {
widgetSetup(tester, 450, windowHeight: 3000);
await tester.pumpWidget(const Material3Demo());
Finder m3Icon = find.widgetWithIcon(IconButton, Icons.filter_3);
Finder m2Icon = find.widgetWithIcon(IconButton, Icons.filter_2);
BuildContext defaultElevatedButton =
tester.firstElement(find.byType(ElevatedButton));
BuildContext defaultIconButton =
tester.firstElement(find.byType(IconButton));
BuildContext defaultFAB =
tester.firstElement(find.byType(FloatingActionButton));
BuildContext defaultCard =
tester.firstElement(find.widgetWithText(Card, 'Elevated'));
BuildContext defaultChip =
tester.firstElement(find.widgetWithText(ActionChip, 'Assist'));
Finder dialog = find.text('Open Dialog');
await tester.tap(dialog);
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext defaultAlertDialog = tester.element(find.byType(AlertDialog));
expect(Theme.of(defaultAlertDialog).useMaterial3, true);
Finder dismiss = find.text('Dismiss');
await tester.tap(dismiss);
await tester.pumpAndSettle(const Duration(microseconds: 500));
expect(m3Icon, findsOneWidget);
expect(m2Icon, findsNothing);
expect(find.text('Material 3'), findsOneWidget);
expect(Theme.of(defaultElevatedButton).useMaterial3, true);
expect(Theme.of(defaultIconButton).useMaterial3, true);
expect(Theme.of(defaultFAB).useMaterial3, true);
expect(Theme.of(defaultCard).useMaterial3, true);
expect(Theme.of(defaultChip).useMaterial3, true);
await tester.tap(m3Icon);
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext updatedElevatedButton =
tester.firstElement(find.byType(ElevatedButton));
BuildContext updatedIconButton =
tester.firstElement(find.byType(IconButton));
BuildContext updatedFAB =
tester.firstElement(find.byType(FloatingActionButton));
BuildContext updatedCard = tester.firstElement(find.byType(Card));
BuildContext updatedChip =
tester.firstElement(find.widgetWithText(ActionChip, 'Assist'));
Finder updatedDialog = find.text('Open Dialog');
await tester.tap(updatedDialog);
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext updatedAlertDialog =
tester.firstElement(find.byType(AlertDialog));
expect(Theme.of(updatedAlertDialog).useMaterial3, false);
Finder updatedDismiss = find.text('Dismiss');
await tester.tap(updatedDismiss);
await tester.pumpAndSettle(const Duration(microseconds: 500));
expect(m3Icon, findsNothing);
expect(m2Icon, findsOneWidget);
expect(find.text('Material 2'), findsOneWidget);
expect(Theme.of(updatedElevatedButton).useMaterial3, false);
expect(Theme.of(updatedIconButton).useMaterial3, false);
expect(Theme.of(updatedFAB).useMaterial3, false);
expect(Theme.of(updatedCard).useMaterial3, false);
expect(Theme.of(updatedChip).useMaterial3, false);
});
testWidgets(
'Other screens become Material2 mode after changing mode from '
'main screen', (tester) async {
await tester.pumpWidget(const Material3Demo());
await tester.tap(find.widgetWithIcon(IconButton, Icons.filter_3));
await tester.tap(find.byIcon(Icons.format_paint_outlined));
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext lightThemeText = tester.element(find.text('Light Theme'));
expect(Theme.of(lightThemeText).useMaterial3, false);
await tester.tap(find.byIcon(Icons.text_snippet_outlined));
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext displayLargeText = tester.element(find.text('Display Large'));
expect(Theme.of(displayLargeText).useMaterial3, false);
await tester.tap(find.byIcon(Icons.invert_colors_on_outlined));
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext material = tester.firstElement(find.byType(Material));
expect(Theme.of(material).useMaterial3, false);
});
testWidgets(
'Brightness mode switches between dark and light when'
'the brightness icon is clicked', (tester) async {
await tester.pumpWidget(const Material3Demo());
Finder lightIcon = find.widgetWithIcon(IconButton, Icons.wb_sunny_outlined);
Finder darkIcon = find.widgetWithIcon(IconButton, Icons.wb_sunny);
BuildContext appBar = tester.element(find.byType(AppBar));
BuildContext body = tester.element(find.byType(Scaffold));
BuildContext navigationRail = tester.element(find.byType(NavigationRail));
expect(lightIcon, findsOneWidget);
expect(darkIcon, findsNothing);
expect(Theme.of(appBar).brightness, Brightness.light);
expect(Theme.of(body).brightness, Brightness.light);
expect(Theme.of(navigationRail).brightness, Brightness.light);
await tester.tap(lightIcon);
await tester.pumpAndSettle(const Duration(microseconds: 500));
BuildContext appBar2 = tester.element(find.byType(AppBar));
BuildContext body2 = tester.element(find.byType(Scaffold));
BuildContext navigationRail2 = tester.element(find.byType(NavigationRail));
expect(lightIcon, findsNothing);
expect(darkIcon, findsOneWidget);
expect(Theme.of(appBar2).brightness, Brightness.dark);
expect(Theme.of(body2).brightness, Brightness.dark);
expect(Theme.of(navigationRail2).brightness, Brightness.dark);
});
testWidgets('Color theme changes when a color is selected from menu',
(tester) async {
await tester.pumpWidget(const Material3Demo());
Finder menuIcon = find.widgetWithIcon(IconButton, Icons.more_vert);
BuildContext appBar = tester.element(find.byType(AppBar));
BuildContext body = tester.element(find.byType(Scaffold));
BuildContext navigationRail = tester.element(find.byType(NavigationRail));
expect(Theme.of(appBar).primaryColor, m3BaseColor);
expect(Theme.of(body).primaryColor, m3BaseColor);
expect(Theme.of(navigationRail).primaryColor, m3BaseColor);
await tester.tap(menuIcon);
await tester.pumpAndSettle();
await tester.tap(find.text('Blue'));
await tester.pumpAndSettle();
BuildContext appBar2 = tester.element(find.byType(AppBar));
BuildContext body2 = tester.element(find.byType(Scaffold));
BuildContext navigationRail2 = tester.element(find.byType(NavigationRail));
ThemeData expectedTheme = ThemeData(colorSchemeSeed: Colors.blue);
expect(Theme.of(appBar2).primaryColor, expectedTheme.primaryColor);
expect(Theme.of(body2).primaryColor, expectedTheme.primaryColor);
expect(Theme.of(navigationRail2).primaryColor, expectedTheme.primaryColor);
});
}
void widgetSetup(WidgetTester tester, double windowWidth,
{double? windowHeight}) {
final height = windowHeight ?? 846;
tester.binding.window.devicePixelRatioTestValue = (2);
final dpi = tester.binding.window.devicePixelRatio;
tester.binding.window.physicalSizeTestValue =
Size(windowWidth * dpi, height * dpi);
}