public async void Update_ErrorsOccurred_ShouldReturnErrorResponse() { var mock = new ServiceMockFacade <ITeacherTeacherSkillService, ITeacherTeacherSkillRepository>(); var model = new ApiTeacherTeacherSkillServerRequestModel(); var validatorMock = new Mock <IApiTeacherTeacherSkillServerRequestModelValidator>(); validatorMock.Setup(x => x.ValidateUpdateAsync(It.IsAny <int>(), It.IsAny <ApiTeacherTeacherSkillServerRequestModel>())).Returns(Task.FromResult(new ValidationResult(new List <ValidationFailure>() { new ValidationFailure("text", "test") }))); mock.RepositoryMock.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult(new TeacherTeacherSkill())); var service = new TeacherTeacherSkillService(mock.LoggerMock.Object, mock.MediatorMock.Object, mock.RepositoryMock.Object, validatorMock.Object, mock.DALMapperMockFactory.DALTeacherTeacherSkillMapperMock); UpdateResponse <ApiTeacherTeacherSkillServerResponseModel> response = await service.Update(default(int), model); response.Should().NotBeNull(); response.Success.Should().BeFalse(); validatorMock.Verify(x => x.ValidateUpdateAsync(It.IsAny <int>(), It.IsAny <ApiTeacherTeacherSkillServerRequestModel>())); mock.MediatorMock.Verify(x => x.Publish(It.IsAny <TeacherTeacherSkillUpdatedNotification>(), It.IsAny <CancellationToken>()), Times.Never()); }