Unit test on data validation in WPF

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Please see the example.
Say I have the data model as

public class Model
{
    [Required(ErrorMessage = "You must enter a username.")]
    [StringLength(10, MinimumLength = 4,
        ErrorMessage = "The username must be between 4 and 10 characters long")]
    [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "The username must only contain letters (a-z, A-Z).")]
    public string Username { get; set; }
 
    [Required(ErrorMessage = "You must enter a name.")]
    public string Name { get; set; }
}

Now I want to do a unit test on the validation. For example if I input invalid charter then click a save button the screen will display a warning message. The message comes from the validation. My question is that should I do it on ViewModel or Model directly?

How, should I mock the ICommand as well?

What I have tried:

I might do on the ViewModel unit test. Say mock up a ViewModel then mock the property of the Model.

Posted 22-May-18 11:09am

Member 12658724

Updated 22-May-18 22:46pm

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F-ES Sitecore · Answer 1 · 2018-05-22T22:47:00

I googled "unit test mvc model validation" and this was the first result

TDD for ASP.NET MVC Part 4: Unit Testing View Model Validation -- Visual Studio Magazine[^]

If you google yourself you'll find others. In general though you should only unit test your own code, the model validation is Microsoft's code and you should simply assume they have tested it themselves and that it works. Saying that, however, as you have regex validation there probably is still value in testing that your regex is working as expected so unit testing in this case is probably ok to do.