I am writing a CSharpAnalyzerTest. The test method is failing because it wants to connect to a private repository that is defined on machine-level as a nuget source. It obviously fails, and throws an exception from RunAsync() with the message: NuGet.Protocol.Core.Types.FatalProtocolException: Unable to load the service index for source…..

On project-level I have a custom nuget.config that resets this to the basics:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <packageSources>
        <clear />
        <add key="public" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    </packageSources>
</configuration>

I have tried to add a nuget.config to TestState.AdditionalFiles, but it is not taken into consideration.

How can I override the nuget settings within the testing environment? How can I ‘inject’ a nuget.config or otherwise take control over how nuget works inside?

[Update]

I have found ReferenceAssemblies.WithNuGetConfigFilePath, although it is not a nice one, as it expects an outside path, not an inside one 🙁