Developer Shares C# Unit Testing Approach for School Sports Registration System

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A developer has shared a set of C# unit tests built for a school sports registration system using xUnit and Moq frameworks. The tests cover model validation, ensuring that missing fields like Season and Sport are correctly flagged as invalid. Service-layer tests verify that the fee calculation logic returns accurate amounts for different season and sport combinations. Controller tests use a mock service to confirm that invalid form submissions re-render the view without calling the service, while valid submissions trigger the service and redirect to a success page. The example serves as a practical introduction to layered unit testing in ASP.NET Core MVC applications.

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