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

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.