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I'm implementing the Data Validation Validators as shown here:
http://www.asp.net/learn/mvc/tutorial-39-cs.aspx
This works great at runtime, but how can I Unit Test to verify if I say attribute [StringLength(10)], an error is returned?
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ComponentModel. DataAnnotations namespace includes the following validator attributes: Range – Enables you to validate whether the value of a property falls between a specified range of values. RegularExpression – Enables you to validate whether the value of a property matches a specified regular expression pattern.
Data annotations (available as part of the System. ComponentModel. DataAnnotations namespace) are attributes that can be applied to classes or class members to specify the relationship between classes, describe how the data is to be displayed in the UI, and specify validation rules.
DataAnnotations is used to configure your model classes, which will highlight the most commonly needed configurations. DataAnnotations are also understood by a number of . NET applications, such as ASP.NET MVC, which allows these applications to leverage the same annotations for client-side validations.
Brad Wilson describes it pretty well in a blog post from a while ago (you'll have to scroll down a bit). Basically, you write tests where you use reflection to make sure that the proper attributes are applied, and then trust the framework to do its job on adding errors. After all, someone else tested the Data Annotation Validators before they were published - you just have to make sure you use them right =)
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This post by Villecoder is the unit testing solution I'm using. It also allows you unit unit test custom annotations
http://villecoder.com/2010/04/23/unit-testing-custom-data-annotations/
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