public async Task IdOfNonexistentSupplier_UpdateSupplier_SupplierNotUpdated() { const int supplierId = -1; var supplierModel = new SupplierModel(); var response = await _suppliersController.UpdateSupplier(supplierId, supplierModel); Assert.IsType <ActionResult <SupplierModel> >(response); Assert.IsType <NotFoundResult>(response.Result); }