Use our file system abstraction

Author: davidwengier

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Rename/RenameService.cs

@@ -24,9 +24,11 @@ namespace Microsoft.CodeAnalysis.Razor.Rename;
 
 internal class RenameService(
     IRazorComponentSearchEngine componentSearchEngine,
+    IFileSystem fileSystem,
     LanguageServerFeatureOptions languageServerFeatureOptions) : IRenameService
 {
     private readonly IRazorComponentSearchEngine _componentSearchEngine = componentSearchEngine;
+    private readonly IFileSystem _fileSystem = fileSystem;
     private readonly LanguageServerFeatureOptions _languageServerFeatureOptions = languageServerFeatureOptions;
 
     public async Task<WorkspaceEdit?> TryGetRazorRenameEditsAsync(
@@ -60,7 +62,7 @@ internal class RenameService(
 
         var originComponentDocumentFilePath = originComponentDocumentSnapshot.FilePath;
         var newPath = MakeNewPath(originComponentDocumentFilePath, newName);
-        if (File.Exists(newPath))
+        if (_fileSystem.FileExists(newPath))
         {
             return null;
         }

src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/Rename/OOPRenameService.cs

@@ -11,7 +11,8 @@ namespace Microsoft.CodeAnalysis.Remote.Razor.Rename;
 [method: ImportingConstructor]
 internal sealed class OOPRenameService(
     IRazorComponentSearchEngine componentSearchEngine,
+    IFileSystem fileSystem,
     LanguageServerFeatureOptions languageServerFeatureOptions)
-    : RenameService(componentSearchEngine, languageServerFeatureOptions)
+    : RenameService(componentSearchEngine, fileSystem, languageServerFeatureOptions)
 {
 }

src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Refactoring/RenameEndpointDelegationTest.cs

@@ -64,7 +64,7 @@ await projectManager.UpdateAsync(updater =>
 
         var searchEngine = new RazorComponentSearchEngine(LoggerFactory);
 
-        var renameService = new RenameService(searchEngine, LanguageServerFeatureOptions);
+        var renameService = new RenameService(searchEngine, new FileSystem(), LanguageServerFeatureOptions);
 
         var endpoint = new RenameEndpoint(
             renameService,

src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Refactoring/RenameEndpointTest.cs

@@ -710,7 +710,7 @@ await projectManager.UpdateAsync(updater =>
 
         clientConnection ??= StrictMock.Of<IClientConnection>();
 
-        var renameService = new RenameService(searchEngine, options);
+        var renameService = new RenameService(searchEngine, new FileSystem(), options);
         var endpoint = new RenameEndpoint(
             renameService,
             options,

src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Cohosting/TestFileSystem.cs

@@ -0,0 +1,32 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using Microsoft.AspNetCore.Razor;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Razor.Utilities;
+using Microsoft.CodeAnalysis.Razor.Workspaces;
+
+namespace Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
+
+internal sealed class TestFileSystem((string filePath, string contents)[]? files) : IFileSystem
+{
+    public bool FileExists(string filePath)
+        => files?.Any(f => FilePathNormalizingComparer.Instance.Equals(f.filePath, filePath)) ?? false;
+
+    public string ReadFile(string filePath)
+        => files.AssumeNotNull().Single(f => FilePathNormalizingComparer.Instance.Equals(f.filePath, filePath)).contents;
+
+    public Stream OpenReadStream(string filePath)
+        => new MemoryStream(Encoding.UTF8.GetBytes(ReadFile(filePath)));
+
+    public IEnumerable<string> GetDirectories(string workspaceDirectory)
+        => throw new NotImplementedException();
+
+    public IEnumerable<string> GetFiles(string workspaceDirectory, string searchPattern, SearchOption searchOption)
+        => throw new NotImplementedException();
+}

src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CodeActions/CohostCodeActionsEndpointTestBase.cs

@@ -186,22 +186,4 @@ private async Task<WorkspaceEdit> ResolveCodeActionAsync(CodeAnalysis.TextDocume
         Assert.NotNull(result?.Edit);
         return result.Edit;
     }
-
-    private class TestFileSystem((string filePath, string contents)[]? files) : IFileSystem
-    {
-        public bool FileExists(string filePath)
-            => files?.Any(f => FilePathNormalizingComparer.Instance.Equals(f.filePath, filePath)) ?? false;
-
-        public string ReadFile(string filePath)
-            => files.AssumeNotNull().Single(f => FilePathNormalizingComparer.Instance.Equals(f.filePath, filePath)).contents;
-
-        public Stream OpenReadStream(string filePath)
-            => new MemoryStream(Encoding.UTF8.GetBytes(ReadFile(filePath)));
-
-        public IEnumerable<string> GetDirectories(string workspaceDirectory)
-            => throw new NotImplementedException();
-
-        public IEnumerable<string> GetFiles(string workspaceDirectory, string searchPattern, SearchOption searchOption)
-            => throw new NotImplementedException();
-    }
 }

src/Razor/test/Microsoft.VisualStudioCode.RazorExtension.Test/Endpoints/Shared/CohostRenameEndpointTest.cs

@@ -846,6 +846,9 @@ private async Task VerifyRenamesAsync(
 
         var requestInvoker = new TestHtmlRequestInvoker([(Methods.TextDocumentRenameName, (object?)null)]);
 
+        var fileSystem = (RemoteFileSystem)OOPExportProvider.GetExportedValue<IFileSystem>();
+        fileSystem.GetTestAccessor().SetFileSystem(new TestFileSystem(additionalFiles));
+
         var endpoint = new CohostRenameEndpoint(IncompatibleProjectService, RemoteServiceInvoker, requestInvoker);
 
         var renameParams = new RenameParams