Fix test error, sdk placed in wrong block

Directory.Packages.props

@@ -17,6 +17,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageVersion>
+    <PackageVersion Include="Castle.Core" Version="5.1.1" />
   </ItemGroup>
 
   <ItemGroup>

NUnit3TestAdapter.sln

@@ -11,6 +11,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		build.cmd = build.cmd
 		build.ps1 = build.ps1
 		src\Directory.Build.props = src\Directory.Build.props
+		Directory.Packages.props = Directory.Packages.props
 		DisableAppDomain.runsettings = DisableAppDomain.runsettings
 		LICENSE = LICENSE
 		src\native-assembly\NativeTests.dll = src\native-assembly\NativeTests.dll

src/NUnit.TestAdapter.Tests.Acceptance/AcceptanceTests.cs

@@ -136,12 +136,12 @@ protected string NUnitVersion(string targetFramework) =>
     private static readonly Lazy<(IsolatedWorkspaceManager Manager, string NupkgVersion, bool KeepWorkspaces)> Initialization = new(() =>
     {
         var directory = TestContext.Parameters["ProjectWorkspaceDirectory"]
-                        ?? TryAutoDetectProjectWorkspaceDirectory()
-                        ?? throw new InvalidOperationException("The test parameter ProjectWorkspaceDirectory must be set in order to run this test.");
+                        ?? TryAutoDetectProjectWorkspaceDirectory()  // Walks the directory tree up to find the project workspace directory, named ".acceptance"
+                        ?? throw new InvalidOperationException("Either The test parameter ProjectWorkspaceDirectory must be set in order to run this test, or the `.acceptance` folder has not been found.  Run cmd line `build -t acceptance` first");
 
         var nupkgDirectory = TestContext.Parameters["TestNupkgDirectory"]
-                             ?? TryAutoDetectTestNupkgDirectory(NuGetPackageId)
-                             ?? throw new InvalidOperationException("The test parameter TestNupkgDirectory must be set in order to run this test.");
+                             ?? TryAutoDetectTestNupkgDirectory(NuGetPackageId)  // Walks the directory tree up to find the test nupkg directory, named "package"
+                             ?? throw new InvalidOperationException("The test parameter TestNupkgDirectory must be set in order to run this test, or the packages have not been created, run cmdline `build -t package` first");
 
         var nupkgVersion = TryGetTestNupkgVersion(nupkgDirectory, packageId: NuGetPackageId)
                            ?? throw new InvalidOperationException($"No NuGet package with the ID {NuGetPackageId} was found in {nupkgDirectory}.");

src/NUnitTestAdapterTests/NUnit.TestAdapter.Tests.csproj

@@ -15,6 +15,7 @@
   <ItemGroup>
     <PackageReference Include="NSubstitute" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp3.1' ">
@@ -23,7 +24,7 @@
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
     <PackageReference Include="NUnit" VersionOverride="4.2.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" VersionOverride="11.0.0" />
   </ItemGroup>