public async void ByMachineGuid_Not_Exists()
{
var mock = new ServiceMockFacade <IMachineService, IMachineRepository>();
mock.RepositoryMock.Setup(x => x.ByMachineGuid(It.IsAny <Guid>())).Returns(Task.FromResult <Machine>(null));
var service = new MachineService(mock.LoggerMock.Object,
mock.MediatorMock.Object,
mock.RepositoryMock.Object,
mock.ModelValidatorMockFactory.MachineModelValidatorMock.Object,
mock.DALMapperMockFactory.DALMachineMapperMock,
mock.DALMapperMockFactory.DALLinkMapperMock);
ApiMachineServerResponseModel response = await service.ByMachineGuid(default(Guid));
response.Should().BeNull();
mock.RepositoryMock.Verify(x => x.ByMachineGuid(It.IsAny <Guid>()));
}