public async void ByFamilyId_Not_Exists() { var mock = new ServiceMockFacade <IStudentService, IStudentRepository>(); mock.RepositoryMock.Setup(x => x.ByFamilyId(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <Student> >(new List <Student>())); var service = new StudentService(mock.LoggerMock.Object, mock.MediatorMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.StudentModelValidatorMock.Object, mock.DALMapperMockFactory.DALStudentMapperMock, mock.DALMapperMockFactory.DALEventStudentMapperMock); List <ApiStudentServerResponseModel> response = await service.ByFamilyId(default(int)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.ByFamilyId(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>())); }