public async void ByUserId_Not_Exists() { var mock = new ServiceMockFacade <ITeacherService, ITeacherRepository>(); mock.RepositoryMock.Setup(x => x.ByUserId(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <Teacher> >(new List <Teacher>())); var service = new TeacherService(mock.LoggerMock.Object, mock.MediatorMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.TeacherModelValidatorMock.Object, mock.DALMapperMockFactory.DALTeacherMapperMock, mock.DALMapperMockFactory.DALEventTeacherMapperMock, mock.DALMapperMockFactory.DALRateMapperMock, mock.DALMapperMockFactory.DALTeacherTeacherSkillMapperMock); List <ApiTeacherServerResponseModel> response = await service.ByUserId(default(int)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.ByUserId(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>())); }