Merge pull request #367 from microsoft/dev/andarno/fixAnalyzerTests

Fix analyzer tests to pull packages from our nuget.config feed

Author: AArnott

test/Microsoft.ServiceHub.Analyzers.Tests/Helpers/ReferencesHelper.cs

@@ -1,15 +1,37 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+#pragma warning disable SA1202 // Elements should be ordered by access - because field initializer depend on each other
+
 using System.Collections.Immutable;
 using Microsoft.CodeAnalysis.Testing;
 
 internal static class ReferencesHelper
 {
+	private static readonly string NuGetConfigPath = FindNuGetConfigPath();
+
 	public static readonly ReferenceAssemblies DefaultReferences = ReferenceAssemblies.Net.Net80
+		.WithNuGetConfigFilePath(NuGetConfigPath)
 		.WithPackages(ImmutableArray.Create(
 			new PackageIdentity("System.ComponentModel.Composition", "8.0.0"),
 			new PackageIdentity("System.Threading.Tasks.Extensions", "4.5.4"),
 			new PackageIdentity("Microsoft.VisualStudio.Threading", "17.13.2"),
 			new PackageIdentity("Microsoft.VisualStudio.Validation", "17.8.8")));
+
+	private static string FindNuGetConfigPath()
+	{
+		string? path = AppContext.BaseDirectory;
+		while (path is not null)
+		{
+			string candidate = Path.Combine(path, "nuget.config");
+			if (File.Exists(candidate))
+			{
+				return candidate;
+			}
+
+			path = Path.GetDirectoryName(path);
+		}
+
+		throw new InvalidOperationException("Could not find NuGet.config by searching up from " + AppContext.BaseDirectory);
+	}
 }