packages/flutter/test/services/system_navigator_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/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  final log = <MethodCall>[];

  Future<void> verify(AsyncCallback test, List<Object> expectations) async {
    log.clear();
    await test();
    expect(log, expectations);
  }

  test('System navigator control test - platform messages', () async {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.platform,
      (MethodCall methodCall) async {
        log.add(methodCall);
        return null;
      },
    );

    await verify(() => SystemNavigator.pop(), <Object>[
      isMethodCall('SystemNavigator.pop', arguments: null),
    ]);

    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.platform,
      null,
    );
  });

  test('System navigator control test - navigation messages', () async {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.navigation,
      (MethodCall methodCall) async {
        log.add(methodCall);
        return null;
      },
    );

    await verify(() => SystemNavigator.selectSingleEntryHistory(), <Object>[
      isMethodCall('selectSingleEntryHistory', arguments: null),
    ]);

    await verify(() => SystemNavigator.selectMultiEntryHistory(), <Object>[
      isMethodCall('selectMultiEntryHistory', arguments: null),
    ]);

    await verify(() => SystemNavigator.routeInformationUpdated(location: 'a'), <Object>[
      isMethodCall(
        'routeInformationUpdated',
        arguments: <String, dynamic>{'uri': 'a', 'state': null, 'replace': false},
      ),
    ]);

    await verify(
      () => SystemNavigator.routeInformationUpdated(location: 'a', state: true),
      <Object>[
        isMethodCall(
          'routeInformationUpdated',
          arguments: <String, dynamic>{'uri': 'a', 'state': true, 'replace': false},
        ),
      ],
    );

    await verify(
      () => SystemNavigator.routeInformationUpdated(location: 'a', state: true, replace: true),
      <Object>[
        isMethodCall(
          'routeInformationUpdated',
          arguments: <String, dynamic>{'uri': 'a', 'state': true, 'replace': true},
        ),
      ],
    );

    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.navigation,
      null,
    );
  });
}