diff --git a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/CodeActions/CodeActionsService.cs b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/CodeActions/CodeActionsService.cs
index 66403209cdd..38ab48f9f44 100644
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/CodeActions/CodeActionsService.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/CodeActions/CodeActionsService.cs
@@ -186,6 +186,15 @@ private RazorVSInternalCodeAction[] ExtractCSharpCodeActionNamesFromData(RazorVS
                 continue;
             }
 
+            // In VS Code, Roslyn adds duplicate code actions for every code action, to implement Fix All functionality.
+            // Until we implement support for that in the C# Extension, we want to filter them out.
+            // https://github.com/dotnet/razor/issues/11832
+            if (jsonData.TryGetProperty("FixAllFlavors", out var fixAllFlavours) &&
+                fixAllFlavours.GetArrayLength() > 0)
+            {
+                continue;
+            }
+
             actions.Add(codeAction);
         }
 
diff --git a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Cohosting/CohostTestBase.cs b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Cohosting/CohostTestBase.cs
index 171cbcee949..6ca282c248f 100644
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Cohosting/CohostTestBase.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Cohosting/CohostTestBase.cs
@@ -118,7 +118,16 @@ private protected void UpdateClientLSPInitializationOptions(Func<RemoteClientLSP
         }
     }
 
-    protected virtual TextDocument CreateProjectAndRazorDocument(
+    protected abstract TextDocument CreateProjectAndRazorDocument(
+        string contents,
+        RazorFileKind? fileKind = null,
+        string? documentFilePath = null,
+        (string fileName, string contents)[]? additionalFiles = null,
+        bool inGlobalNamespace = false,
+        bool miscellaneousFile = false);
+
+    protected TextDocument CreateProjectAndRazorDocument(
+        CodeAnalysis.Workspace remoteWorkspace,
         string contents,
         RazorFileKind? fileKind = null,
         string? documentFilePath = null,
@@ -136,7 +145,6 @@ protected virtual TextDocument CreateProjectAndRazorDocument(
         var projectId = ProjectId.CreateNewId(debugName: TestProjectData.SomeProject.DisplayName);
         var documentId = DocumentId.CreateNewId(projectId, debugName: documentFilePath);
 
-        var remoteWorkspace = RemoteWorkspaceProvider.Instance.GetWorkspace();
         return CreateProjectAndRazorDocument(remoteWorkspace, projectId, miscellaneousFile, documentId, documentFilePath, contents, additionalFiles, inGlobalNamespace);
     }
 
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CohostEndpointTestBase.cs b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CohostEndpointTestBase.cs
index af642abc0a9..439cbf66772 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CohostEndpointTestBase.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CohostEndpointTestBase.cs
@@ -14,8 +14,8 @@
 using Microsoft.CodeAnalysis.Razor.SemanticTokens;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Settings;
+using Microsoft.CodeAnalysis.Remote.Razor;
 using Microsoft.VisualStudio.Composition;
-using Microsoft.VisualStudio.Language.CodeCleanUp;
 using Microsoft.VisualStudio.Razor.Settings;
 using Xunit;
 using Xunit.Abstractions;
@@ -94,7 +94,8 @@ protected TextDocument CreateProjectAndRazorDocument(
     {
         if (remoteOnly)
         {
-            return base.CreateProjectAndRazorDocument(contents, fileKind: null, documentFilePath: null, additionalFiles: null, inGlobalNamespace: false, miscellaneousFile: false);
+            var remoteWorkspace = RemoteWorkspaceProvider.Instance.GetWorkspace();
+            return base.CreateProjectAndRazorDocument(remoteWorkspace, contents, fileKind: null, documentFilePath: null, additionalFiles: null, inGlobalNamespace: false, miscellaneousFile: false);
         }
 
         return this.CreateProjectAndRazorDocument(contents);
@@ -108,7 +109,8 @@ protected override TextDocument CreateProjectAndRazorDocument(
         bool inGlobalNamespace = false,
         bool miscellaneousFile = false)
     {
-        var remoteDocument = base.CreateProjectAndRazorDocument(contents, fileKind, documentFilePath, additionalFiles, inGlobalNamespace, miscellaneousFile);
+        var remoteWorkspace = RemoteWorkspaceProvider.Instance.GetWorkspace();
+        var remoteDocument = base.CreateProjectAndRazorDocument(remoteWorkspace, contents, fileKind, documentFilePath, additionalFiles, inGlobalNamespace, miscellaneousFile);
 
         // In this project we simulate remote services running OOP by creating a different workspace with a different
         // set of services to represent the devenv Roslyn side of things. We don't have any actual solution syncing set
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Microsoft.VisualStudio.LanguageServices.Razor.Test.csproj b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Microsoft.VisualStudio.LanguageServices.Razor.Test.csproj
index 3a0ef1b36d7..d79fbd45c76 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Microsoft.VisualStudio.LanguageServices.Razor.Test.csproj
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Microsoft.VisualStudio.LanguageServices.Razor.Test.csproj
@@ -15,7 +15,7 @@
       <Link>Shared\%(RecursiveDir)%(FileName)%(Extension)</Link>
     </Compile>
 
-    <Compile Include="..\Microsoft.VisualStudioCode.RazorExtension.Test\Endpoints\Shared\*.cs" LinkBase="Cohost\Shared" />
+    <Compile Include="..\Microsoft.VisualStudioCode.RazorExtension.Test\Endpoints\Shared\**\*.cs" LinkBase="Cohost\Shared" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/CohostEndpointTestBase.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/CohostEndpointTestBase.cs
index 0cdc84b48d8..7cf127581ee 100644
--- a/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/CohostEndpointTestBase.cs
+++ b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/CohostEndpointTestBase.cs
@@ -2,17 +2,22 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
+using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor;
+using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.LanguageServer.Test;
+using Microsoft.AspNetCore.Razor.Test.Common.Mef;
+using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Razor.Remote;
 using Microsoft.CodeAnalysis.Razor.SemanticTokens;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Settings;
 using Microsoft.CodeAnalysis.Remote.Razor;
-using Microsoft.VisualStudio.Composition;
 using Microsoft.VisualStudioCode.RazorExtension.Configuration;
 using Microsoft.VisualStudioCode.RazorExtension.Services;
+using Xunit;
 using Xunit.Abstractions;
 
 namespace Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
@@ -23,16 +28,13 @@ public abstract class CohostEndpointTestBase(ITestOutputHelper testOutputHelper)
     private VSCodeRemoteServiceInvoker? _remoteServiceInvoker;
     private IFilePathService? _filePathService;
     private ISemanticTokensLegendService? _semanticTokensLegendService;
+    private Workspace? _workspace;
 
     private protected override IRemoteServiceInvoker RemoteServiceInvoker => _remoteServiceInvoker.AssumeNotNull();
     private protected override IClientSettingsManager ClientSettingsManager => _clientSettingsManager.AssumeNotNull();
     private protected override IFilePathService FilePathService => _filePathService.AssumeNotNull();
     private protected ISemanticTokensLegendService SemanticTokensLegendService => _semanticTokensLegendService.AssumeNotNull();
-
-    /// <summary>
-    /// The export provider for Roslyn "devenv" services, if tests opt-in to using them
-    /// </summary>
-    private protected ExportProvider? RoslynDevenvExportProvider { get; private set; }
+    private protected Workspace Workspace => _workspace.AssumeNotNull();
 
     protected override async Task InitializeAsync()
     {
@@ -40,9 +42,10 @@ protected override async Task InitializeAsync()
 
         InProcServiceFactory.TestAccessor.SetExportProvider(OOPExportProvider);
 
+        _workspace = CreateWorkspace();
+
         var workspaceProvider = new VSCodeWorkspaceProvider();
-        var remoteWorkspace = RemoteWorkspaceProvider.Instance.GetWorkspace();
-        workspaceProvider.SetWorkspace(remoteWorkspace);
+        workspaceProvider.SetWorkspace(Workspace);
 
         _remoteServiceInvoker = new VSCodeRemoteServiceInvoker(workspaceProvider, LoggerFactory);
         AddDisposable(_remoteServiceInvoker);
@@ -82,4 +85,32 @@ private protected override RemoteClientLSPInitializationOptions GetRemoteClientL
             TokenTypes = []
         };
     }
+
+    protected override TextDocument CreateProjectAndRazorDocument(
+        string contents,
+        RazorFileKind? fileKind = null,
+        string? documentFilePath = null,
+        (string fileName, string contents)[]? additionalFiles = null,
+        bool inGlobalNamespace = false,
+        bool miscellaneousFile = false)
+    {
+        return CreateProjectAndRazorDocument(Workspace, contents, fileKind, documentFilePath, additionalFiles, inGlobalNamespace, miscellaneousFile);
+    }
+
+    private AdhocWorkspace CreateWorkspace()
+    {
+        var composition = TestComposition.RoslynFeatures;
+
+        // We can't enforce that the composition is entirely valid, because we don't have a full MEF catalog, but we
+        // can assume there should be no errors related to Razor, and having this array makes debugging failures a lot
+        // easier.
+        var errors = composition.GetCompositionErrors().ToArray();
+        Assert.Empty(errors.Where(e => e.Contains("Razor")));
+
+        var roslynExportProvider = composition.ExportProviderFactory.CreateExportProvider();
+        AddDisposable(roslynExportProvider);
+        var workspace = TestWorkspace.CreateWithDiagnosticAnalyzers(roslynExportProvider);
+        AddDisposable(workspace);
+        return workspace;
+    }
 }
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/AddUsingTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/AddUsingTests.cs
similarity index 95%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/AddUsingTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/AddUsingTests.cs
index ba04d124c34..d371a075978 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/AddUsingTests.cs
+++ b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/AddUsingTests.cs
@@ -31,6 +31,9 @@ public async Task FullyQualify()
         await VerifyCodeActionAsync(input, expected, LanguageServerConstants.CodeActions.FullyQualify);
     }
 
+#if !VSCODE
+    // This uses a nested code action in Roslyn which we don't support in VS Code
+    // https://github.com/dotnet/razor/issues/11832
     [Fact]
     public async Task FullyQualify_Multiple()
     {
@@ -58,6 +61,7 @@ public class StringBuilder
             codeActionName: LanguageServerConstants.CodeActions.FullyQualify,
             childActionIndex: 0);
     }
+#endif
 
     [Fact]
     public async Task AddUsing()
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CSharpCodeActionTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CSharpCodeActionTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CSharpCodeActionTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CSharpCodeActionTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CohostCodeActionsEndpointTestBase.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CohostCodeActionsEndpointTestBase.cs
similarity index 97%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CohostCodeActionsEndpointTestBase.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CohostCodeActionsEndpointTestBase.cs
index be617d26f0e..4346d9bf3b5 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CohostCodeActionsEndpointTestBase.cs
+++ b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CohostCodeActionsEndpointTestBase.cs
@@ -20,8 +20,6 @@
 using Microsoft.CodeAnalysis.Razor.Utilities;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Remote.Razor;
-using Microsoft.CodeAnalysis.Text;
-using Microsoft.VisualStudio.Razor.Settings;
 using Roslyn.Test.Utilities;
 using Xunit;
 using Xunit.Abstractions;
@@ -220,8 +218,7 @@ private async Task VerifyCodeActionResultAsync(TextDocument document, WorkspaceE
     private async Task<WorkspaceEdit> ResolveCodeActionAsync(CodeAnalysis.TextDocument document, CodeAction codeAction)
     {
         var requestInvoker = new TestHtmlRequestInvoker();
-        var clientSettingsManager = new ClientSettingsManager(changeTriggers: []);
-        var endpoint = new CohostCodeActionsResolveEndpoint(IncompatibleProjectService, RemoteServiceInvoker, ClientCapabilitiesService, clientSettingsManager, requestInvoker);
+        var endpoint = new CohostCodeActionsResolveEndpoint(IncompatibleProjectService, RemoteServiceInvoker, ClientCapabilitiesService, ClientSettingsManager, requestInvoker);
 
         var result = await endpoint.GetTestAccessor().HandleRequestAsync(document, codeAction, DisposalToken);
 
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CreateComponentFromTagTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CreateComponentFromTagTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/CreateComponentFromTagTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CreateComponentFromTagTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToCodeBehindTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToCodeBehindTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToCodeBehindTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToCodeBehindTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToComponentTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToComponentTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToComponentTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToComponentTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToCssTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToCssTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/ExtractToCssTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/ExtractToCssTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/GenerateEventHandlerTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/GenerateEventHandlerTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/GenerateEventHandlerTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/GenerateEventHandlerTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/PromoteUsingDirectiveTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/PromoteUsingDirectiveTests.cs
similarity index 82%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/PromoteUsingDirectiveTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/PromoteUsingDirectiveTests.cs
index 94206c090be..6bbee233de4 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/PromoteUsingDirectiveTests.cs
+++ b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/PromoteUsingDirectiveTests.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Threading.Tasks;
+using System.IO;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.CodeAnalysis.Razor.Protocol;
 using Xunit;
@@ -30,7 +31,7 @@ Hello World
                 """,
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             additionalExpectedFiles: [
-                (FileUri(@"..\_Imports.razor"), """
+                (FileUri(Path.Combine("..", "_Imports.razor")), """
                     @using System
                     """)]);
     }
@@ -58,7 +59,7 @@ Hello World
                 """,
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             additionalExpectedFiles: [
-                (FileUri(@"..\_Imports.razor"), """
+                (FileUri(Path.Combine("..", "_Imports.razor")), """
                     @using System
                     """)]);
     }
@@ -83,7 +84,7 @@ Hello World
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             fileKind: RazorFileKind.Legacy,
             additionalExpectedFiles: [
-                (FileUri(@"..\_ViewImports.cshtml"), """
+                (FileUri(Path.Combine("..", "_ViewImports.cshtml")), """
                     @using System
                     """)]);
     }
@@ -99,9 +100,9 @@ @using [||]System
                     Hello World
                 </div>
                 """,
-            documentFilePath: FilePath(@"My\Deeply\Nested\File.razor"),
+            documentFilePath: FilePath(Path.Combine("My", "Deeply", "Nested", "File.razor")),
             additionalFiles: [
-                (FilePath(@"My\Deeply\_Imports.razor"), """
+                (FilePath(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                     """)],
@@ -113,7 +114,7 @@ Hello World
                 """,
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             additionalExpectedFiles: [
-                (FileUri(@"My\Deeply\_Imports.razor"), """
+                (FileUri(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                     @using System
@@ -131,9 +132,9 @@ @using [||]System
                     Hello World
                 </div>
                 """,
-            documentFilePath: FilePath(@"My\Deeply\Nested\File.razor"),
+            documentFilePath: FilePath(Path.Combine("My", "Deeply", "Nested", "File.razor")),
             additionalFiles: [
-                (FilePath(@"My\Deeply\_Imports.razor"), """
+                (FilePath(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                     
@@ -146,7 +147,7 @@ Hello World
                 """,
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             additionalExpectedFiles: [
-                (FileUri(@"My\Deeply\_Imports.razor"), """
+                (FileUri(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                     @using System
@@ -164,9 +165,9 @@ @using [||]System
                     Hello World
                 </div>
                 """,
-            documentFilePath: FilePath(@"My\Deeply\Nested\File.razor"),
+            documentFilePath: FilePath(Path.Combine("My", "Deeply", "Nested", "File.razor")),
             additionalFiles: [
-                (FilePath(@"My\Deeply\_Imports.razor"), """
+                (FilePath(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                         
@@ -179,7 +180,7 @@ Hello World
                 """,
             codeActionName: LanguageServerConstants.CodeActions.PromoteUsingDirective,
             additionalExpectedFiles: [
-                (FileUri(@"My\Deeply\_Imports.razor"), """
+                (FileUri(Path.Combine("My", "Deeply", "_Imports.razor")), """
                     @using System.Text
                     @using Foo.Bar
                     @using System    
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/SimplifyTagToSelfClosingTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/SimplifyTagToSelfClosingTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/SimplifyTagToSelfClosingTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/SimplifyTagToSelfClosingTests.cs
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/TypeAccessibilityTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/TypeAccessibilityTests.cs
similarity index 98%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/TypeAccessibilityTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/TypeAccessibilityTests.cs
index 73d52469d91..14e2294d31b 100644
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/TypeAccessibilityTests.cs
+++ b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/TypeAccessibilityTests.cs
@@ -93,6 +93,7 @@ public async Task AddUsingShouldBeFirst()
 
         var document = CreateRazorDocument(input);
         var codeActions = await GetCodeActionsAsync(document, input);
+        Assert.NotNull(codeActions);
 
         Assert.Equal(LanguageServerConstants.CodeActions.AddUsing, codeActions.Select(a => ((RazorVSInternalCodeAction)a.Value!).Name).First());
     }
diff --git a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/WrapAttributeTests.cs b/src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/WrapAttributeTests.cs
similarity index 100%
rename from src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CodeActions/WrapAttributeTests.cs
rename to src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/WrapAttributeTests.cs