samples/material_3_demo/test/typography_screen_test.dart

// 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/main.dart';
import 'package:material_3_demo/typography_screen.dart';

import 'component_screen_test.dart';

void main() {
  testWidgets(
      'Typography screen shows correctly when the corresponding icon is '
      'selected on NavigationBar', (tester) async {
    widgetSetup(tester, 449);
    addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
    await tester.pumpWidget(const App());

    expect(find.text('Display Large'), findsNothing);
    expect(find.byType(NavigationBar), findsOneWidget);
    Finder textIconOnBar = find.descendant(
        of: find.byType(NavigationBar),
        matching: find.byIcon(Icons.text_snippet_outlined));
    expect(textIconOnBar, findsOneWidget);
    await tester.tap(textIconOnBar);
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    expect(textIconOnBar, findsNothing);
    Finder selectedTextIconOnBar = find.descendant(
        of: find.byType(NavigationBar),
        matching: find.byIcon(Icons.text_snippet));
    expect(selectedTextIconOnBar, findsOneWidget);
    expect(find.text('Display Large'), findsOneWidget);
  });

  testWidgets(
      'Typography screen shows correctly when the corresponding icon is '
      'selected on NavigationRail', (tester) async {
    widgetSetup(
        tester, 1200); // NavigationRail shows only when width is > 1000.
    addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
    await tester.pumpWidget(const App());
    expect(find.text('Display Large'), findsNothing);
    Finder textIconOnRail = find.descendant(
        of: find.byType(NavigationRail),
        matching: find.byIcon(Icons.text_snippet_outlined));
    expect(textIconOnRail, findsOneWidget);
    await tester.tap(textIconOnRail);
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    expect(textIconOnRail, findsNothing);
    Finder selectedTextIconOnRail = find.descendant(
        of: find.byType(NavigationRail),
        matching: find.byIcon(Icons.text_snippet));
    expect(selectedTextIconOnRail, findsOneWidget);
    expect(find.text('Display Large'), findsOneWidget);
  });

  testWidgets('Typography screen shows correct content', (tester) async {
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(body: Row(children: const [TypographyScreen()])),
    ));
    expect(find.text('Display Large'), findsOneWidget);
    expect(find.text('Display Medium'), findsOneWidget);
    expect(find.text('Display Small'), findsOneWidget);
    expect(find.text('Headline Large'), findsOneWidget);
    expect(find.text('Headline Medium'), findsOneWidget);
    expect(find.text('Headline Small'), findsOneWidget);
    expect(find.text('Title Large'), findsOneWidget);
    expect(find.text('Title Medium'), findsOneWidget);
    expect(find.text('Title Small'), findsOneWidget);
    await tester.scrollUntilVisible(
      find.text('Body Small'),
      500.0,
    );
    expect(find.text('Label Large'), findsOneWidget);
    expect(find.text('Label Medium'), findsOneWidget);
    expect(find.text('Label Small'), findsOneWidget);
    expect(find.text('Body Large'), findsOneWidget);
    expect(find.text('Body Medium'), findsOneWidget);
    expect(find.text('Body Small'), findsOneWidget);

    expect(find.byType(TextStyleExample), findsNWidgets(15));
  });
}