in src/Shared/MSBuildSdkTestBase.cs [18:31]
public MSBuildSdkTestBase()
{
File.WriteAllText(
Path.Combine(TestRootPath, "NuGet.config"),
@"<?xml version=""1.0"" encoding=""utf-8""?>
<configuration>
<packageSources>
<clear />
<add key=""NuGet.org"" value=""https://api.nuget.org/v3/index.json"" />
</packageSources>
</configuration>");
Environment.CurrentDirectory = TestRootPath;
}