diff --git a/AspNetCoreSdkTests/AspNetCoreSdkTests.csproj b/AspNetCoreSdkTests/AspNetCoreSdkTests.csproj
index 3028413b33..1989546e1a 100644
--- a/AspNetCoreSdkTests/AspNetCoreSdkTests.csproj
+++ b/AspNetCoreSdkTests/AspNetCoreSdkTests.csproj
@@ -15,16 +15,4 @@
     <PackageReference Include="NUnit3TestAdapter" Version="3.10.0" />
   </ItemGroup>
 
-  <ItemGroup>
-    <None Update="NuGetConfig\NuGet.DotNetCore.config">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="NuGetConfig\NuGet.NuGetOrg.config">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="NuGetConfig\NuGet.Empty.config">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-  </ItemGroup>
-
 </Project>
diff --git a/AspNetCoreSdkTests/TemplateTests.cs b/AspNetCoreSdkTests/FrameworkDependent.cs
similarity index 76%
rename from AspNetCoreSdkTests/TemplateTests.cs
rename to AspNetCoreSdkTests/FrameworkDependent.cs
index 80804a4f72..eb865fa816 100644
--- a/AspNetCoreSdkTests/TemplateTests.cs
+++ b/AspNetCoreSdkTests/FrameworkDependent.cs
@@ -7,7 +7,7 @@ using System.Net;
 namespace AspNetCoreSdkTests
 {
     [TestFixture]
-    public class TemplateTests
+    public class FrameworkDependent
     {
         [Test]
         [TestCaseSource(nameof(RestoreData))]
@@ -48,19 +48,19 @@ namespace AspNetCoreSdkTests
 
         public static IEnumerable<Template> RestoreData = new[]
         {
-            Template.GetInstance<ClassLibraryTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<ConsoleApplicationTemplate>(NuGetConfig.Empty),
+            Template.GetInstance<ClassLibraryTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<ConsoleApplicationTemplate>(NuGetPackageSource.None),
             
             // Offline restore currently not supported for RazorClassLibrary template (https://github.com/aspnet/Universe/issues/1123)
-            Template.GetInstance<RazorClassLibraryTemplate>(NuGetConfig.NuGetOrg),
+            Template.GetInstance<RazorClassLibraryTemplate>(NuGetPackageSource.NuGetOrg),
 
-            Template.GetInstance<WebTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<RazorTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<MvcTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<AngularTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<ReactTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<ReactReduxTemplate>(NuGetConfig.Empty),
-            Template.GetInstance<WebApiTemplate>(NuGetConfig.Empty),
+            Template.GetInstance<WebTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<RazorTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<MvcTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<AngularTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<ReactTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<ReactReduxTemplate>(NuGetPackageSource.None),
+            Template.GetInstance<WebApiTemplate>(NuGetPackageSource.None),
         };
 
         public static IEnumerable<Template> BuildData => RestoreData;
diff --git a/AspNetCoreSdkTests/NuGetConfig.cs b/AspNetCoreSdkTests/NuGetConfig.cs
deleted file mode 100644
index 8443084754..0000000000
--- a/AspNetCoreSdkTests/NuGetConfig.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-namespace AspNetCoreSdkTests
-{
-    public enum NuGetConfig
-    {
-        Empty,
-        DotNetCore,
-        NuGetOrg
-    }
-}
diff --git a/AspNetCoreSdkTests/NuGetConfig/NuGet.DotNetCore.config b/AspNetCoreSdkTests/NuGetConfig/NuGet.DotNetCore.config
deleted file mode 100644
index fc7c007517..0000000000
--- a/AspNetCoreSdkTests/NuGetConfig/NuGet.DotNetCore.config
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <add key="DotNetCore" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />    
-  </packageSources>
-</configuration>
diff --git a/AspNetCoreSdkTests/NuGetConfig/NuGet.Empty.config b/AspNetCoreSdkTests/NuGetConfig/NuGet.Empty.config
deleted file mode 100644
index 4bb3170917..0000000000
--- a/AspNetCoreSdkTests/NuGetConfig/NuGet.Empty.config
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <clear />
-  </packageSources>
-</configuration>
diff --git a/AspNetCoreSdkTests/NuGetConfig/NuGet.NuGetOrg.config b/AspNetCoreSdkTests/NuGetConfig/NuGet.NuGetOrg.config
deleted file mode 100644
index b0743e46f8..0000000000
--- a/AspNetCoreSdkTests/NuGetConfig/NuGet.NuGetOrg.config
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <add key="NuGet" value="https://api.nuget.org/v3/index.json" />    
-  </packageSources>
-</configuration>
diff --git a/AspNetCoreSdkTests/NuGetPackageSource.cs b/AspNetCoreSdkTests/NuGetPackageSource.cs
new file mode 100644
index 0000000000..206102f222
--- /dev/null
+++ b/AspNetCoreSdkTests/NuGetPackageSource.cs
@@ -0,0 +1,9 @@
+namespace AspNetCoreSdkTests
+{
+    public enum NuGetPackageSource
+    {
+        None,
+        NuGetOrg,
+        EnvironmentVariable,
+    }
+}
diff --git a/AspNetCoreSdkTests/Templates/Template.cs b/AspNetCoreSdkTests/Templates/Template.cs
index 0910768e80..d1d267656d 100644
--- a/AspNetCoreSdkTests/Templates/Template.cs
+++ b/AspNetCoreSdkTests/Templates/Template.cs
@@ -21,11 +21,11 @@ namespace AspNetCoreSdkTests.Templates
             ServerCertificateCustomValidationCallback = (m, c, ch, p) => true
         });
 
-        private static ConcurrentDictionary<(Type, NuGetConfig), Template> _templates = new ConcurrentDictionary<(Type, NuGetConfig), Template>();
+        private static ConcurrentDictionary<(Type, NuGetPackageSource), Template> _templates = new ConcurrentDictionary<(Type, NuGetPackageSource), Template>();
 
-        public static T GetInstance<T>(NuGetConfig nuGetConfig) where T : Template, new()
+        public static T GetInstance<T>(NuGetPackageSource nuGetPackageSource) where T : Template, new()
         {
-            return (T)_templates.GetOrAdd((typeof(T), nuGetConfig), (k) => new T() { NuGetConfig = nuGetConfig });
+            return (T)_templates.GetOrAdd((typeof(T), nuGetPackageSource), (k) => new T() { NuGetPackageSource = nuGetPackageSource });
         }
 
         private Lazy<IEnumerable<string>> _objFilesAfterRestore;
@@ -34,7 +34,7 @@ namespace AspNetCoreSdkTests.Templates
         private Lazy<(HttpResponseMessage Http, HttpResponseMessage Https)> _httpResponsesAfterRun;
         private Lazy<(HttpResponseMessage Http, HttpResponseMessage Https)> _httpResponsesAfterExec;
 
-        public NuGetConfig NuGetConfig { get; private set; }
+        public NuGetPackageSource NuGetPackageSource { get; private set; }
 
         protected Template()
         {
@@ -54,9 +54,9 @@ namespace AspNetCoreSdkTests.Templates
                 GetHttpResponsesAfterExec, LazyThreadSafetyMode.ExecutionAndPublication);
         }
 
-        public override string ToString() => $"{Name},{NuGetConfig}";
+        public override string ToString() => $"{Name},{NuGetPackageSource}";
 
-        private string TempDir => Path.Combine(AssemblySetUp.TempDir, Name, NuGetConfig.ToString());
+        private string TempDir => Path.Combine(AssemblySetUp.TempDir, Name, NuGetPackageSource.ToString());
 
         public abstract string Name { get; }
         public abstract TemplateType Type { get; }
@@ -89,8 +89,8 @@ namespace AspNetCoreSdkTests.Templates
         {
             Directory.CreateDirectory(TempDir);
             DotNetUtil.New(Name, TempDir);
-            DotNetUtil.Restore(TempDir, NuGetConfig);
-            return IOUtil.GetFiles(System.IO.Path.Combine(TempDir, "obj"));
+            DotNetUtil.Restore(TempDir, NuGetPackageSource);
+            return IOUtil.GetFiles(Path.Combine(TempDir, "obj"));
         }
 
         private (IEnumerable<string> ObjFiles, IEnumerable<string> BinFiles) GetFilesAfterBuild()
@@ -99,7 +99,7 @@ namespace AspNetCoreSdkTests.Templates
             _ = ObjFilesAfterRestore;
 
             DotNetUtil.Build(TempDir);
-            return (IOUtil.GetFiles(System.IO.Path.Combine(TempDir, "obj")), IOUtil.GetFiles(System.IO.Path.Combine(TempDir, "bin")));
+            return (IOUtil.GetFiles(Path.Combine(TempDir, "obj")), IOUtil.GetFiles(Path.Combine(TempDir, "bin")));
         }
 
         private IEnumerable<string> GetFilesAfterPublish()
@@ -108,7 +108,7 @@ namespace AspNetCoreSdkTests.Templates
             _ = BinFilesAfterBuild;
 
             DotNetUtil.Publish(TempDir);
-            return IOUtil.GetFiles(System.IO.Path.Combine(TempDir, DotNetUtil.PublishOutput));
+            return IOUtil.GetFiles(Path.Combine(TempDir, DotNetUtil.PublishOutput));
         }
 
         private (HttpResponseMessage Http, HttpResponseMessage Https) GetHttpResponsesAfterRun()
diff --git a/AspNetCoreSdkTests/Util/DotNetUtil.cs b/AspNetCoreSdkTests/Util/DotNetUtil.cs
index 22fbd999cb..cf8c7a6c41 100644
--- a/AspNetCoreSdkTests/Util/DotNetUtil.cs
+++ b/AspNetCoreSdkTests/Util/DotNetUtil.cs
@@ -8,6 +8,15 @@ namespace AspNetCoreSdkTests.Util
 {
     internal static class DotNetUtil
     {
+        private const string _clearPackageSourcesNuGetConfig =
+@"<?xml version=""1.0"" encoding=""utf-8""?>
+<configuration>
+  <packageSources>
+    <clear />
+  </packageSources>
+</configuration>
+";
+
         // Bind to dynamic port 0 to avoid port conflicts during parallel tests
         private const string _urls = "--urls http://127.0.0.1:0;https://127.0.0.1:0";
 
@@ -22,13 +31,16 @@ namespace AspNetCoreSdkTests.Util
 
         public static string New(string template, string workingDirectory)
         {
+            // Clear all packages sources by default.  May be overridden by NuGetPackageSource parameter.
+            File.WriteAllText(Path.Combine(workingDirectory, "NuGet.config"), _clearPackageSourcesNuGetConfig);
+
             return RunDotNet($"new {template} --name {template} --output . --no-restore", workingDirectory, GetEnvironment(workingDirectory));
         }
 
-        public static string Restore(string workingDirectory, NuGetConfig config)
+        public static string Restore(string workingDirectory, NuGetPackageSource packageSource)
         {
-            var configPath = Path.GetFullPath(Path.Combine("NuGetConfig", $"NuGet.{config}.config"));
-            return RunDotNet($"restore --no-cache --configfile {configPath}", workingDirectory, GetEnvironment(workingDirectory));
+            var sourceArgument = GetSourceArgument(packageSource);
+            return RunDotNet($"restore --no-cache{sourceArgument}", workingDirectory, GetEnvironment(workingDirectory));
         }
 
         public static string Build(string workingDirectory)
@@ -52,6 +64,24 @@ namespace AspNetCoreSdkTests.Util
             return RunDotNet($"publish --no-build -o {PublishOutput}", workingDirectory, GetEnvironment(workingDirectory));
         }
 
+        private static string GetSourceArgument(NuGetPackageSource packageSource)
+        {
+            switch (packageSource)
+            {
+                case NuGetPackageSource.None:
+                    return string.Empty;
+                case NuGetPackageSource.NuGetOrg:
+                    return " --source https://api.nuget.org/v3/index.json";
+                case NuGetPackageSource.EnvironmentVariable:
+                    var env = Environment.GetEnvironmentVariable("NUGET_PACKAGE_SOURCE");
+                    return string.IsNullOrEmpty(env) ?
+                        throw new InvalidOperationException("Environment variable NUGET_PACKAGE_SOURCE is required but not set") :
+                        $" --source env";
+                default:
+                    throw new ArgumentException("Invalid value", nameof(packageSource));
+            }
+        }
+
         private static string RunDotNet(string arguments, string workingDirectory,
             IEnumerable<KeyValuePair<string, string>> environment = null, bool throwOnError = true)
         {