examples/api/test/widgets/routes/route_observer.0_test.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/rendering.dart';
import 'package:flutter_api_samples/widgets/routes/route_observer.0.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('RouteObserver notifies RouteAware widget', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(const example.RouteObserverApp());

    // Check the initial RouteObserver logs.
    expect(find.text('didPush'), findsOneWidget);

    // Tap on the button to push a new route.
    await tester.tap(find.text('Go to next page'));
    await tester.pumpAndSettle();

    // Tap on the button to go back to the previous route.
    await tester.tap(find.text('Go back to RouteAware page'));
    await tester.pumpAndSettle();

    // Check the RouteObserver logs after the route is popped.
    expect(find.text('didPush'), findsOneWidget);
    expect(find.text('didPopNext'), findsOneWidget);

    // Tap on the button to push a new route again.
    await tester.tap(find.text('Go to next page'));
    await tester.pumpAndSettle();

    // Tap on the button to go back to the previous route again.
    await tester.tap(find.text('Go back to RouteAware page'));
    await tester.pumpAndSettle();

    // Check the RouteObserver logs after the route is popped again.
    expect(find.text('didPush'), findsOneWidget);
    expect(find.text('didPopNext'), findsNWidgets(2));

    // Check if any overflow or layout exceptions occurred.
    expect(tester.takeException(), isNull);
  });

  testWidgets(
    'RouteObserver example renders without overflow on small screens',
    (WidgetTester tester) async {
      // Set the screen size to a smaller value.
      tester.view.physicalSize = const Size(200, 200);
      addTearDown(tester.view.reset);

      // Build the RouteObserver example widget.
      await tester.pumpWidget(const example.RouteObserverApp());
      await tester.pumpAndSettle();

      // Verify there are no layout exceptions.
      expect(tester.takeException(), isNull);
    },
  );
}