public async void OfficerId_Update_Valid_Reference() { Mock <IVehicleOfficerRepository> vehicleOfficerRepository = new Mock <IVehicleOfficerRepository>(); vehicleOfficerRepository.Setup(x => x.OfficerByOfficerId(It.IsAny <int>())).Returns(Task.FromResult <Officer>(new Officer())); var validator = new ApiVehicleOfficerServerRequestModelValidator(vehicleOfficerRepository.Object); await validator.ValidateUpdateAsync(default(int), new ApiVehicleOfficerServerRequestModel()); validator.ShouldNotHaveValidationErrorFor(x => x.OfficerId, 1); }