Update test framework for .NET 6 stuff

src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Formatting/FormattingTestBase.cs

@@ -17,6 +17,7 @@ using Microsoft.AspNetCore.Razor.LanguageServer.Test;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor;
 using Microsoft.CodeAnalysis.Options;
+using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Razor.Serialization;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Extensions;
@@ -255,11 +256,12 @@ namespace Microsoft.AspNetCore.Razor.LanguageServer.Formatting
             var projectEngine = RazorProjectEngine.Create(builder =>
             {
                 builder.SetRootNamespace("Test");
+                builder.Features.Add(new DefaultTypeNameFeature());
                 RazorExtensions.Register(builder);
             });
             var codeDocument = projectEngine.ProcessDesignTime(sourceDocument, fileKind, new[] { importsDocument }, tagHelpers);
 
-            Assert.False(codeDocument.GetCSharpDocument().Diagnostics.Any(), "Error creating document: " + string.Join(Environment.NewLine, codeDocument.GetCSharpDocument().Diagnostics));
+            Assert.False(codeDocument.GetCSharpDocument().Diagnostics.Any(), "Error creating document:" + Environment.NewLine + string.Join(Environment.NewLine, codeDocument.GetCSharpDocument().Diagnostics));
 
             var documentSnapshot = new Mock<DocumentSnapshot>(MockBehavior.Strict);
             documentSnapshot.Setup(d => d.GetGeneratedOutputAsync()).Returns(Task.FromResult(codeDocument));

src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common/Language/IntegrationTests/RazorIntegrationTestBase.cs

@@ -129,6 +129,8 @@ namespace Microsoft.AspNetCore.Razor.Language.IntegrationTests
                     b.Phases.Insert(0, new ForceLineEndingPhase(LineEnding));
                 }
 
+                b.Features.Add(new DefaultTypeNameFeature());
+
                 b.Features.Add(new CompilationTagHelperFeature());
                 b.Features.Add(new DefaultMetadataReferenceFeature()
                 {

src/Razor/test/Microsoft.AspNetCore.Razor.Test.ComponentShim/Microsoft.AspNetCore.Components.netstandard2.0.cs

@@ -59,6 +59,12 @@ namespace Microsoft.AspNetCore.Components
         public string Suffix { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
         public string ValueAttribute { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
     }
+    [System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple = true, Inherited = false)]
+    public sealed class CascadingTypeParameterAttribute : System.Attribute
+    {
+        public CascadingTypeParameterAttribute(string name) { }
+        public string Name { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=true)]
     public sealed partial class CascadingParameterAttribute : System.Attribute
     {