Merge pull request #1497 from microsoft/dev/andarno/fixAnalyzerTests

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

Author: AArnott

test/Microsoft.VisualStudio.Threading.Analyzers.Tests/Helpers/ReferencesHelper.cs

@@ -1,20 +1,27 @@
 // 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;
 using System.Collections.Immutable;
+using System.IO;
 using System.Net;
 
 namespace Microsoft.VisualStudio.Threading.Analyzers.Tests;
 
 internal static class ReferencesHelper
 {
+    private static readonly string NuGetConfigPath = FindNuGetConfigPath();
+
 #if NETFRAMEWORK
     public static ReferenceAssemblies DefaultReferences = ReferenceAssemblies.NetFramework.Net471.Default
 #elif NET8_0
     public static ReferenceAssemblies DefaultReferences = ReferenceAssemblies.Net.Net80
 #else
 #error Fix TFM conditions
 #endif
+        .WithNuGetConfigFilePath(NuGetConfigPath)
         .WithPackages(ImmutableArray.Create(
             new PackageIdentity("System.Collections.Immutable", "6.0.0"),
             new PackageIdentity("System.Threading.Tasks.Extensions", "4.6.0"),
@@ -32,4 +39,21 @@ static ReferencesHelper()
         ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
 #pragma warning restore RS0030 // Do not used banned APIs
     }
+
+    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);
+    }
 }