public async void ByName_Not_Exists() { var mock = new ServiceMockFacade <IDepartmentRepository>(); mock.RepositoryMock.Setup(x => x.ByName(It.IsAny <string>())).Returns(Task.FromResult <Department>(null)); var service = new DepartmentService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.DepartmentModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLDepartmentMapperMock, mock.DALMapperMockFactory.DALDepartmentMapperMock, mock.BOLMapperMockFactory.BOLEmployeeDepartmentHistoryMapperMock, mock.DALMapperMockFactory.DALEmployeeDepartmentHistoryMapperMock); ApiDepartmentResponseModel response = await service.ByName(default(string)); response.Should().BeNull(); mock.RepositoryMock.Verify(x => x.ByName(It.IsAny <string>())); }