Unit Testing complex validations (study)
Some validations are complex. Let’s explore how .NET data annotation validation and FluentValidation can be combined and (unit) tested.
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Let’s combine Data Annotation Validation with FluentValidation
Ever since I wrote the blog “Is One Of” and “Is Not One Of” validation attributes, I’ve wondered if there is anything better for class validation. I mean: validating individual properties is fine, but usually the more interesting stuff is the validation of a combination of members.
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“Is One Of” and “Is Not One Of” validation attributes
I love attribute validation! They can be used for a myriad of things. In .NET Core MVC we use them to validate models that come into our controllers. In one of our projects we kept running into the same thing: we need to validate a value against an array of pre-defined values. So we wrote some base validation attributes.
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