examples/api/test/material/scaffold/scaffold_messenger_state.show_snack_bar.2_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/material.dart';
import 'package:flutter_api_samples/material/scaffold/scaffold_messenger_state.show_snack_bar.2.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('ScaffoldMessenger showSnackBar animation can be customized using AnimationStyle',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.SnackBarApp(),
      );

      // Tap the button to show the SnackBar with default animation style.
      await tester.tap(find.byType(ElevatedButton));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 125)); // Advance the animation by 125ms.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(576.7, 0.1));

      await tester.pump(const Duration(milliseconds: 125)); // Advance the animation by 125ms.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(566, 0.1));

      // Tap the close button to dismiss the SnackBar.
      await tester.tap(find.byType(IconButton));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 250)); // Advance the animation by 250ms.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(614, 0.1));

      // Select custom animation style.
      await tester.tap(find.text('Custom'));
      await tester.pumpAndSettle();

      // Tap the button to show the SnackBar with custom animation style.
      await tester.tap(find.byType(ElevatedButton));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 1500)); // Advance the animation by 125ms.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(576.7, 0.1));

      await tester.pump(const Duration(milliseconds: 1500)); // Advance the animation by 125ms.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(566, 0.1));

      // Tap the close button to dismiss the SnackBar.
      await tester.tap(find.byType(IconButton));
      await tester.pump();
      await tester.pump(const Duration(seconds: 1)); // Advance the animation by 1sec.

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(614, 0.1));

      // Select no animation style.
      await tester.tap(find.text('None'));
      await tester.pumpAndSettle();

      // Tap the button to show the SnackBar with no animation style.
      await tester.tap(find.byType(ElevatedButton));
      await tester.pump();

      expect(tester.getTopLeft(find.text('I am a snack bar.')).dy, closeTo(566, 0.1));

      // Tap the close button to dismiss the SnackBar.
      await tester.tap(find.byType(IconButton));
      await tester.pump();

      expect(find.text('I am a snack bar.'), findsNothing);
  });
}