Why does everything have to use interface?

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https://github.com/moq/moq4#features-at-a-glance

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So what you are saying is that companies such as Microsoft have no idea what they are doing? Have you ever looked at their open source repos, such as https://github.com/dotnet/aspnetcore/tree/main/src ? Almost every class implements an interface, otherwise you're not going to unit test it properly.

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Hmm not exactly. Maybe there's a specific example you're thinking of. Since you mentioned it, IEnumerable has no type constraints. Interfaces aren't part of the picture here.

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