public async void DeviceId_Create_Valid_Reference() { Mock <IDeviceActionRepository> deviceActionRepository = new Mock <IDeviceActionRepository>(); deviceActionRepository.Setup(x => x.DeviceByDeviceId(It.IsAny <int>())).Returns(Task.FromResult <Device>(new Device())); var validator = new ApiDeviceActionServerRequestModelValidator(deviceActionRepository.Object); await validator.ValidateCreateAsync(new ApiDeviceActionServerRequestModel()); validator.ShouldNotHaveValidationErrorFor(x => x.DeviceId, 1); }