Repository Design Pattern in Flutter: repository test

report_repository_test.dart

void main() {
  late IReportRepository reportRepository;
  late ReportHelper mockReportHelper;
  late MockMonitoringAPIProvider mockApiProvider;
  late MockNetworkInfo mockNetworkInfo;
  
  setUp(() {
    mockReportHelper = MockReportHelper();
    mockApiProvider = MockMonitoringAPIProvider();
    mockNetworkInfo = MockNetworkInfo();

    reportRepository = ReportRepository(
      localDataSource: mockReportHelper,
      remoteDataSource: mockApiProvider,
      networkInfo: mockNetworkInfo,
    );
  });

  test('queryAll when connected', () async {
    when(mockNetworkInfo.isConnected()).thenAnswer((_) async => true);
    when(mockApiProvider.getReports()).thenAnswer((_) async => _dummyReports);
    when(mockReportHelper.insert(_dummyReports[0]))
        .thenAnswer((realInvocation) async => _dummyReports[0]);
    when(mockReportHelper.insert(_dummyReports[1]))
        .thenAnswer((realInvocation) async => _dummyReports[1]);
    when(mockReportHelper.insert(_dummyReports[2]))
        .thenAnswer((realInvocation) async => _dummyReports[2]);
    when(mockApiProvider.getReports()).thenAnswer((_) async => _dummyReports);
    when(mockReportHelper.queryAll()).thenAnswer((_) async => _dummyReports);

    List<Report> result = await reportRepository.queryAll();

    verify(mockApiProvider.getReports()).called(1);
    verify(mockReportHelper.insert(_dummyReports[0])).called(1);
    verify(mockReportHelper.insert(_dummyReports[1])).called(1);
    verify(mockReportHelper.insert(_dummyReports[2])).called(1);
    verify(mockReportHelper.queryAll()).called(1);
    expect(result, _dummyReports);
  });
  
  test('queryAll when not connected', () async {
    when(mockNetworkInfo.isConnected()).thenAnswer((_) async => false);
    when(mockReportHelper.queryAll()).thenAnswer((_) async => _dummyReports);

    List<Report> result = await reportRepository.queryAll();

    verify(mockReportHelper.queryAll()).called(1);
    expect(result, _dummyReports);
  });

  // ...
}