Make tests work with grouped fixes.

src/EditorFeatures/CSharpTest/Diagnostics/GenerateType/GenerateTypeTests.cs

@@ -24,9 +24,7 @@ public partial class GenerateTypeTests : AbstractCSharpDiagnosticProviderBasedUs
         }
 
         protected override IList<CodeAction> MassageActions(IList<CodeAction> codeActions)
-        {
-            return FlattenActions(codeActions);
-        }
+            => FlattenActions(codeActions);
 
         #region Generate Class
 

src/EditorFeatures/CSharpTest/Diagnostics/SpellCheck/SpellCheckTests.cs

@@ -7,6 +7,8 @@
 using Microsoft.CodeAnalysis.CSharp.CodeFixes.Spellcheck;
 using Xunit;
 using Roslyn.Test.Utilities;
+using Microsoft.CodeAnalysis.CodeActions;
+using System.Collections.Generic;
 
 namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Diagnostics.SpellCheck
 {
@@ -17,6 +19,9 @@ public class SpellCheckTests : AbstractCSharpDiagnosticProviderBasedUserDiagnost
             return Tuple.Create<DiagnosticAnalyzer, CodeFixProvider>(null, new CSharpSpellCheckCodeFixProvider());
         }
 
+        protected override IList<CodeAction> MassageActions(IList<CodeAction> actions)
+            => FlattenActions(actions);
+
         [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsSpellcheck)]
         public async Task TestNoSpellcheckForIfOnly2Characters()
         {

src/EditorFeatures/VisualBasicTest/Diagnostics/Spellcheck/SpellcheckTests.vb

 ' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
+Imports Microsoft.CodeAnalysis.CodeActions
 Imports Microsoft.CodeAnalysis.CodeFixes
 Imports Microsoft.CodeAnalysis.Diagnostics
 Imports Microsoft.CodeAnalysis.Editor.UnitTests.Extensions
@@ -14,6 +15,10 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Spellc
             Return Tuple.Create(Of DiagnosticAnalyzer, CodeFixProvider)(Nothing, New VisualBasicSpellCheckCodeFixProvider())
         End Function
 
+        Protected Overrides Function MassageActions(actions As IList(Of CodeAction)) As IList(Of CodeAction)
+            Return FlattenActions(actions)
+        End Function
+
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsSpellcheck)>
         Public Async Function TestNoSpellcheckForIfOnly2Characters() As Task
             Dim text = <File>Class Foo