Fix broken tests

src/EditorFeatures/CSharpTest/MakeClassAbstract/MakeClassAbstractTests.cs

-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.CodeFixes;

src/EditorFeatures/VisualBasicTest/MakeClassAbstract/MakeClassAbstractTests.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.
+' Licensed to the .NET Foundation under one or more agreements.
+' The .NET Foundation licenses this file to you under the MIT license.
+' See the LICENSE file in the project root for more information.
 
 Imports Microsoft.CodeAnalysis.CodeFixes
 Imports Microsoft.CodeAnalysis.Diagnostics
@@ -14,80 +16,55 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.MakeClassAbstract
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
-        Public Async Function TestMethod() As Task
-            Await TestInRegularAndScript1Async(
-"
+        Public Async Function TestMethod_CodeFix() As Task
+            Await TestInRegularAndScript1Async("
 Public Class [|Foo|]
     Public MustOverride Sub M()
 End Class",
 "
-Public MustInherit Class Foo
+Public MustOverride Class Foo
     Public MustOverride Sub M()
 End Class")
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
-        Public Async Function TestMethodEnclosingClassWithoutAccessibility() As Task
-            Await TestInRegularAndScript1Async(
-"
+        Public Async Function TestMethodEnclosingClassWithoutAccessibility_NoCodeFix() As Task
+            Await TestMissingInRegularAndScriptAsync("
 Class Foo
     Public MustOverride Sub [|M|]()
-End Class",
-"
-MustInherit Class Foo
-    Public MustOverride Sub M()
 End Class")
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function TestMethodEnclosingClassDocumentationComment() As Task
-            Await TestInRegularAndScript1Async(
-"
+            Await TestMissingInRegularAndScriptAsync("
 ''' <summary>
 ''' Some class comment.
 ''' </summary>
 Public Class Foo
     Public MustOverride Sub [|M|]()
-End Class",
-"
-''' <summary>
-''' Some class comment.
-''' </summary>
-Public MustInherit Class Foo
-    Public MustOverride Sub M()
 End Class")
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function TestProperty() As Task
-            Await TestInRegularAndScript1Async(
-"
+            Await TestMissingInRegularAndScriptAsync("
 Public Class Foo
     Public MustOverride Property [|P|] As Object
-End Class",
-"
-Public MustInherit Class Foo
-    Public MustOverride Property P As Object
 End Class")
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function TestIndexer() As Task
-            Await TestInRegularAndScript1Async(
-"
+            Await TestMissingInRegularAndScriptAsync("
 Public Class Foo
     Default Public MustOverride Property [|Item|](ByVal o As Object) As Object
-End Class",
-"
-Public MustInherit Class Foo
-    Default Public MustOverride Property Item(ByVal o As Object) As Object
 End Class")
         End Function
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function TestEvent() As Task
-            Await TestMissingInRegularAndScriptAsync(
-"
+            Await TestMissingInRegularAndScriptAsync("
 Public Class Foo
     Public MustOverride Custom Event [|E|] As EventHandler
 End Class")
@@ -95,8 +72,7 @@ End Class")
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function TestMethodWithBody() As Task
-            Await TestMissingInRegularAndScriptAsync(
-"
+            Await TestMissingInRegularAndScriptAsync("
 Public Class Foo
     Public MustOverride Function [|M|]() As Integer
         Return 3
@@ -139,8 +115,7 @@ End Class")
 
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeClassAbstract)>
         Public Async Function FixAll() As Task
-            Await TestInRegularAndScript1Async(
-"
+            Await TestMissingInRegularAndScriptAsync("
 Namespace NS
     Public Class C1
         Public MustOverride Sub {|FixAllInDocument:M|}()
@@ -157,24 +132,6 @@ Namespace NS
             Public MustOverride Sub M()
         End Class
     End Class
-End Namespace",
-"
-Namespace NS
-    Public MustInherit Class C1
-        Public MustOverride Sub M()
-        Public MustOverride Property P As Object
-        Default Public MustOverride Property Item(ByVal o As Object) As Object
-    End Class
-
-    Public MustInherit Class C2
-        Public MustOverride Sub M()
-    End Class
-
-    Public Class C3
-        Public MustInherit Class InnerClass
-            Public MustOverride Sub M()
-        End Class
-    End Class
 End Namespace")
         End Function
     End Class

src/Features/CSharp/Portable/MakeClassAbstract/CSharpMakeClassAbstractCodeFixProvider.cs

-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 #nullable enable
 
+using System;
 using System.Collections.Immutable;
 using System.Composition;
 using System.Diagnostics.CodeAnalysis;
@@ -14,6 +17,12 @@ namespace Microsoft.CodeAnalysis.CSharp.MakeClassAbstract
     [ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(CSharpMakeClassAbstractCodeFixProvider)), Shared]
     internal sealed class CSharpMakeClassAbstractCodeFixProvider : AbstractMakeClassAbstractCodeFixProvider<ClassDeclarationSyntax>
     {
+        [ImportingConstructor]
+        [SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
+        public CSharpMakeClassAbstractCodeFixProvider()
+        {
+        }
+
         public override ImmutableArray<string> FixableDiagnosticIds { get; } =
                ImmutableArray.Create(
                    "CS0513" // 'C.M()' is abstract but it is contained in non-abstract class 'C'

src/Features/Core/Portable/MakeClassAbstract/AbstractMakeClassAbstractCodeFixProvider.cs

-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 #nullable enable
 

src/Features/VisualBasic/Portable/MakeClassAbstract/VisualBasicMakeClassAbstractCodeFixProvider.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.
+' Licensed to the .NET Foundation under one or more agreements.
+' The .NET Foundation licenses this file to you under the MIT license.
+' See the LICENSE file in the project root for more information.
 
 Imports System.Collections.Immutable
 Imports System.Composition
+Imports System.Diagnostics.CodeAnalysis
 Imports Microsoft.CodeAnalysis.CodeRefactorings
 Imports Microsoft.CodeAnalysis.MakeClassAbstract
 Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
@@ -11,6 +14,11 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.MakeClassAbstract
     Friend NotInheritable Class VisualBasicMakeClassAbstractCodeFixProvider
         Inherits AbstractMakeClassAbstractCodeFixProvider(Of ClassStatementSyntax)
 
+        <ImportingConstructor>
+        <SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification:="Used in test code: https://github.com/dotnet/roslyn/issues/42814")>
+        Public Sub New()
+        End Sub
+
         Public Overrides ReadOnly Property FixableDiagnosticIds As ImmutableArray(Of String) =
             ImmutableArray.Create(
                 "BC31411"