public void WhenGetFormGroupErrorClassCalledWithError_ReturnEmptyString() { var controller = new EditYourDetailsController(_compositeSettings, _authService, _addressSearchService, _dssReader, _dssWriter, _documentService, _config) { ControllerContext = new ControllerContext { HttpContext = new DefaultHttpContext() } }; var viewModel = new EditDetailsCompositeViewModel(); viewModel.GetFormGroupErrorClass("test", controller.ViewData.ModelState).Should().BeNullOrEmpty(); }