diff --git a/build/Test.targets b/build/Test.targets
index 9f4ce8778..f9642c6a3 100644
--- a/build/Test.targets
+++ b/build/Test.targets
@@ -10,6 +10,7 @@
     <TestPackagesDir>$(TestOutputDir)/packages/</TestPackagesDir>
     <TestArtifactsDir>$(TestOutputDir)/artifacts/</TestArtifactsDir>
     <TestResultXmlDir>$(TestOutputDir)/results/</TestResultXmlDir>
+    <ExternalRestoreSourcesTestsContainer>$(TestArtifactsDir)/ExternalRestoreSourcesForTestsContainer.txt</ExternalRestoreSourcesTestsContainer>
   </PropertyGroup>
 
   <Target Name="Test"
@@ -51,6 +52,11 @@
           DependsOnTargets="Init;
                             SetupTestProjectData">
     <MakeDir Directories="$(TestPackagesDir)" Condition="!Exists('$(TestPackagesDir)')"/>
+
+    <WriteLinesToFile Condition="'$(ExternalRestoreSources)' != ''"
+                      File="$(ExternalRestoreSourcesTestsContainer)"
+                      Lines="&lt;add key=&quot;PrivateBlobFeed%(NugetConfigPrivateFeeds.Identity)&quot; value=&quot;%(NugetConfigPrivateFeeds.Identity)&quot; /&gt;"
+                      Overwrite="false" />
   </Target>
 
   <Target Name="RestoreTests"
diff --git a/test/Microsoft.DotNet.Cli.Utils.Tests/GivenAProjectToolsCommandResolver.cs b/test/Microsoft.DotNet.Cli.Utils.Tests/GivenAProjectToolsCommandResolver.cs
index 9cb3f69dd..c0d08f3e3 100644
--- a/test/Microsoft.DotNet.Cli.Utils.Tests/GivenAProjectToolsCommandResolver.cs
+++ b/test/Microsoft.DotNet.Cli.Utils.Tests/GivenAProjectToolsCommandResolver.cs
@@ -339,7 +339,7 @@ namespace Microsoft.DotNet.Tests
             var testInstance = TestAssets.Get("AppWithFallbackFolderToolDependency")
                 .CreateInstance()
                 .WithSourceFiles()
-                .WithNuGetConfig(new RepoDirectoriesProvider().TestPackages);
+                .WithNuGetConfigAndExternalRestoreSources(new RepoDirectoriesProvider().TestPackages);
             var testProjectDirectory = testInstance.Root.FullName;
             var fallbackFolder = Path.Combine(testProjectDirectory, "fallbackFolder");
 
@@ -382,7 +382,7 @@ namespace Microsoft.DotNet.Tests
             var testInstance = TestAssets.Get("AppWithFallbackFolderToolDependency")
                 .CreateInstance()
                 .WithSourceFiles()
-                .WithNuGetConfig(new RepoDirectoriesProvider().TestPackages);
+                .WithNuGetConfigAndExternalRestoreSources(new RepoDirectoriesProvider().TestPackages);
             var testProjectDirectory = testInstance.Root.FullName;
             var fallbackFolder = Path.Combine(testProjectDirectory, "fallbackFolder");
 
diff --git a/test/Microsoft.DotNet.TestFramework/TestAssetInstance.cs b/test/Microsoft.DotNet.TestFramework/TestAssetInstance.cs
index fca0c33c2..6bac31a7c 100644
--- a/test/Microsoft.DotNet.TestFramework/TestAssetInstance.cs
+++ b/test/Microsoft.DotNet.TestFramework/TestAssetInstance.cs
@@ -109,19 +109,23 @@ namespace Microsoft.DotNet.TestFramework
             return this;
         }
 
-        public TestAssetInstance WithNuGetConfig(string nugetCache)
+        public TestAssetInstance WithNuGetConfig(string nugetCache, string externalRestoreSources = null)
         {
             var thisAssembly = typeof(TestAssetInstance).GetTypeInfo().Assembly;
             var newNuGetConfig = Root.GetFile("NuGet.Config");
+            externalRestoreSources = externalRestoreSources ?? string.Empty;
 
             var content = @"<?xml version=""1.0"" encoding=""utf-8""?>
             <configuration>
               <packageSources>
                 <add key=""dotnet-core"" value=""https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json"" />
                 <add key=""test-packages"" value=""$fullpath$"" />
+                $externalRestoreSources$
               </packageSources>
             </configuration>";
-            content = content.Replace("$fullpath$", nugetCache);
+            content = content
+                .Replace("$fullpath$", nugetCache)
+                .Replace("$externalRestoreSources$", externalRestoreSources);
 
             using (var newNuGetConfigStream =
                 new FileStream(newNuGetConfig.FullName, FileMode.Create, FileAccess.Write))
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/RepoDirectoriesProvider.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/RepoDirectoriesProvider.cs
index 7de277852..de2af4896 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/RepoDirectoriesProvider.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/RepoDirectoriesProvider.cs
@@ -22,6 +22,7 @@ namespace Microsoft.DotNet.Tools.Test.Utilities
         private string _stage2WithBackwardsCompatibleRuntimesDirectory;
         private string _testPackages;
         private string _testWorkingFolder;
+        private string _testArtifactsFolder;
 
         public static string RepoRoot
         {
@@ -92,6 +93,7 @@ namespace Microsoft.DotNet.Tools.Test.Utilities
         public string Stage2WithBackwardsCompatibleRuntimesDirectory => _stage2WithBackwardsCompatibleRuntimesDirectory;
         public string TestPackages => _testPackages;
         public string TestWorkingFolder => _testWorkingFolder;
+        public string TestArtifactsFolder => _testArtifactsFolder;
 
         public RepoDirectoriesProvider(
             string artifacts = null,
@@ -123,6 +125,8 @@ namespace Microsoft.DotNet.Tools.Test.Utilities
                 _testPackages = Path.Combine(_artifacts, "test", "packages");
             }
 
+            _testArtifactsFolder = Path.Combine(_artifacts, "test", "artifacts");
+
             _testWorkingFolder = Path.Combine(RepoRoot,
                                               "bin",
                                               (previousStage + 1).ToString(),
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/TestAssetInstanceExtensions.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/TestAssetInstanceExtensions.cs
new file mode 100644
index 000000000..a1cf95916
--- /dev/null
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/TestAssetInstanceExtensions.cs
@@ -0,0 +1,33 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+using Microsoft.DotNet.Cli.Utils;
+using Microsoft.DotNet.TestFramework;
+using Microsoft.DotNet.Tools.Common;
+
+namespace Microsoft.DotNet.Tools.Test.Utilities
+{
+    public static class TestAssetInstanceExtensions
+    {
+        public static TestAssetInstance WithNuGetConfigAndExternalRestoreSources(
+            this TestAssetInstance testAssetInstance, string nugetCache)
+        {
+            var externalRestoreSourcesForTests = Path.Combine(
+                new RepoDirectoriesProvider().TestArtifactsFolder, "ExternalRestoreSourcesForTestsContainer.txt");
+            var externalRestoreSources = File.Exists(externalRestoreSourcesForTests) ?
+                File.ReadAllText(externalRestoreSourcesForTests) :
+                string.Empty;
+
+            return testAssetInstance.WithNuGetConfig(nugetCache, externalRestoreSources);
+        }
+    }
+}
\ No newline at end of file