public async void ByUserId_Not_Exists()
{
var mock = new ServiceMockFacade <IMessengerService, IMessengerRepository>();
mock.RepositoryMock.Setup(x => x.ByUserId(It.IsAny <int?>(), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <Messenger> >(new List <Messenger>()));
var service = new MessengerService(mock.LoggerMock.Object,
mock.MediatorMock.Object,
mock.RepositoryMock.Object,
mock.ModelValidatorMockFactory.MessengerModelValidatorMock.Object,
mock.DALMapperMockFactory.DALMessengerMapperMock);
List <ApiMessengerServerResponseModel> response = await service.ByUserId(default(int));
response.Should().BeEmpty();
mock.RepositoryMock.Verify(x => x.ByUserId(It.IsAny <int?>(), It.IsAny <int>(), It.IsAny <int>()));
}