samples/platform_channels/test/src/add_pet_details_test.dart

// Copyright 2020 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.

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:platform_channels/src/add_pet_details.dart';

void main() {
  group('AddPetDetails tests', () {
    var petList = <Map>[];

    setUpAll(() {
      const BasicMessageChannel<dynamic>(
              'jsonMessageCodecDemo', JSONMessageCodec())
          .setMockMessageHandler((dynamic message) async {
        petList.add(message as Map);
      });
    });

    testWidgets('Enter pet details', (tester) async {
      await tester.pumpWidget(MaterialApp(home: AddPetDetails()));

      // Enter the breed of cat.
      await tester.enterText(find.byType(TextField), 'Persian');
      // Select cat from the pet type.
      await tester.tap(find.text('Cat'));

      // Initially the list will be empty.
      expect(petList, isEmpty);
      await tester.tap(find.byIcon(Icons.add));

      expect(petList, isNotEmpty);
      expect(petList.last['breed'], 'Persian');
    });
  });
}