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Comment by mvdtnz | Hacker News Reader

This exists (in kind of a hacky way) in C# with the ExternalsVisibleTo attribute. It exposes methods and classes only to specified assemblies (like your unit test assemblies).

https://learn.microsoft.com/en-us/dotnet/api/system.runtime....

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You can actually stick this in your csproj. I'm on a phone, so bear with me, but roughly

    <InternalsVisibleTo Include="assemblyname" />

Which means you can do stuff with msbuild props, like auto including a `$(assemblyname).Tests` into your projects.

This exists in many Java based languages, an annotation above a method: @VisibleForTesting or some such.

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