Fix imports issue with test project

src/SourceBuild/content/test/Directory.Build.props

@@ -1,2 +1,7 @@
 <Project>
+  <!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
+  <PropertyGroup>
+
+
+  </PropertyGroup>
 </Project>

src/SourceBuild/content/test/Microsoft.DotNet.UnifiedBuild.Tests/Config.cs

@@ -18,10 +18,10 @@ public class Config : IDisposable
     public Config(IMessageSink sink)
     {
         _sink = sink;
-        UbBuildVersion = (string)AppContext.GetData(BuildVersionSwitch);
+        UbBuildVersion = (string)(AppContext.GetData(BuildVersionSwitch) ?? throw new InvalidOperationException("Unified Build version must be specified"));
-        TargetRid = (string)AppContext.GetData(TargetRidSwitch);
+        TargetRid = (string)(AppContext.GetData(TargetRidSwitch) ?? throw new InvalidOperationException("Target RID must be specified"));
-        PortableRid = (string)AppContext.GetData(PortableRidSwitch);
+        PortableRid = (string)(AppContext.GetData(PortableRidSwitch) ?? throw new InvalidOperationException("Portable RID must be specified"));
-        UbSdkArchivePath = (string)AppContext.GetData(UbSdkArchivePathSwitch);
+        UbSdkArchivePath = (string)(AppContext.GetData(UbSdkArchivePathSwitch) ?? throw new InvalidOperationException("Unified Build SDK archive path must be specified"));
         TargetArchitecture = TargetRid.Split('-')[1];
         MsftSdkArchivePath = AppContext.GetData(MsftSdkArchivePathSwitch) as string ?? DownloadMsftSdkArchive().Result;
     }

src/SourceBuild/content/test/Microsoft.DotNet.UnifiedBuild.Tests/Microsoft.DotNet.UnifiedBuild.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
+
   <Import Project="Sdk.props" Sdk="Microsoft.DotNet.Arcade.Sdk" />
-  <Import Project="../../Directory.Build.props" />
+
-  <Import Project="../../Directory.Build.targets" />
   <PropertyGroup>
     <TargetFramework>$(NetCurrent)</TargetFramework>
     <Nullable>enable</Nullable>
@@ -36,5 +36,4 @@
     </ItemGroup>
   </Target>
 
-  <Import Project="Sdk.targets" Sdk="Microsoft.DotNet.Arcade.Sdk" />
 </Project>

src/SourceBuild/content/test/Microsoft.DotNet.UnifiedBuild.Tests/SdkKind.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Microsoft.DotNet.UnifiedBuild.Tests
+{
+    internal enum SdkKind
+    {
+        Microsoft,
+        UnifiedBuild
+    }
+}