public async void ByPublicId_Not_Exists() { var mock = new ServiceMockFacade <IDeviceService, IDeviceRepository>(); mock.RepositoryMock.Setup(x => x.ByPublicId(It.IsAny <Guid>())).Returns(Task.FromResult <Device>(null)); var service = new DeviceService(mock.LoggerMock.Object, mock.MediatorMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.DeviceModelValidatorMock.Object, mock.DALMapperMockFactory.DALDeviceMapperMock, mock.DALMapperMockFactory.DALDeviceActionMapperMock); ApiDeviceServerResponseModel response = await service.ByPublicId(default(Guid)); response.Should().BeNull(); mock.RepositoryMock.Verify(x => x.ByPublicId(It.IsAny <Guid>())); }