Fixing the failing test by using a package that is not part of the asp.net runtime.

TestAssets/TestProjects/NuGetConfigDependentProject/NuGetConfigDependentProject.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="NuGet.Configuration" Version="4.3.0-beta1-2418" />
+  </ItemGroup>
+</Project>

TestAssets/TestProjects/NuGetConfigDependentProject/Program.cs

@@ -0,0 +1,16 @@
+// 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;
+using NuGet.Configuration;
+
+class Program
+{
+    public static void Main(string[] args)
+    {
+        var settingValue = new SettingValue("key", "value", false);
+
+        Console.WriteLine(settingValue.Key);
+    }
+}