public void UpdateTotalPageTest()
{
CustomerFormPresentationModel model = new CustomerFormPresentationModel(new Model());
model.UpdateTotalPage(10, 0);
PrivateObject target = new PrivateObject(model);
List <CategoryState> categoryState = (List <CategoryState>)target.GetFieldOrProperty("_categoriesState");
Assert.AreEqual(categoryState[0].TotalPage, 2);
model.UpdateTotalPage(6, 1);
Assert.AreEqual(categoryState[1].TotalPage, 1);
}