diff --git a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpAnalyzerVerifier.cs b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpAnalyzerVerifier.cs
index cfbc023573b3..50c40fbad788 100644
--- a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpAnalyzerVerifier.cs
+++ b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpAnalyzerVerifier.cs
@@ -2,15 +2,16 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Collections.Immutable;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.InternalTesting;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Testing;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Testing;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.AspNetCore.Hosting;
 
 namespace Microsoft.AspNetCore.Analyzers.Verifiers;
 
@@ -30,7 +31,7 @@ public static DiagnosticResult Diagnostic(DiagnosticDescriptor descriptor)
         => CSharpAnalyzerVerifier<TAnalyzer, DefaultVerifier>.Diagnostic(descriptor);
 
     /// <inheritdoc cref="AnalyzerVerifier{TAnalyzer, TTest, TVerifier}.VerifyAnalyzerAsync(string, DiagnosticResult[])"/>
-    public static async Task VerifyAnalyzerAsync(string source, params DiagnosticResult[] expected)
+    public static async Task VerifyAnalyzerAsync([StringSyntax("C#-test")] string source, params DiagnosticResult[] expected)
     {
         var test = new CSharpAnalyzerTest<TAnalyzer, DefaultVerifier>
         {
diff --git a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpCodeFixVerifier.cs b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpCodeFixVerifier.cs
index c39a1a87e87b..06d8979d58a9 100644
--- a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpCodeFixVerifier.cs
+++ b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpCodeFixVerifier.cs
@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CSharp.Testing;
@@ -26,7 +27,7 @@ public static DiagnosticResult Diagnostic(DiagnosticDescriptor descriptor)
         => CSharpCodeFixVerifier<TAnalyzer, TCodeFix, DefaultVerifier>.Diagnostic(descriptor);
 
     /// <inheritdoc cref="CodeFixVerifier{TAnalyzer, TCodeFix, TTest, TVerifier}.VerifyAnalyzerAsync(string, DiagnosticResult[])"/>
-    public static async Task VerifyAnalyzerAsync(string source, params DiagnosticResult[] expected)
+    public static async Task VerifyAnalyzerAsync([StringSyntax("C#-test")] string source, params DiagnosticResult[] expected)
     {
         var test = new CSharpCodeFixTest<TAnalyzer, TCodeFix, DefaultVerifier>
         {
@@ -43,15 +44,15 @@ public static async Task VerifyAnalyzerAsync(string source, params DiagnosticRes
     }
 
     /// <inheritdoc cref="CodeFixVerifier{TAnalyzer, TCodeFix, TTest, TVerifier}.VerifyCodeFixAsync(string, string)"/>
-    public static async Task VerifyCodeFixAsync(string source, string fixedSource)
+    public static async Task VerifyCodeFixAsync([StringSyntax("C#-test")] string source, string fixedSource)
         => await VerifyCodeFixAsync(source, DiagnosticResult.EmptyDiagnosticResults, fixedSource);
 
     /// <inheritdoc cref="CodeFixVerifier{TAnalyzer, TCodeFix, TTest, TVerifier}.VerifyCodeFixAsync(string, DiagnosticResult, string)"/>
-    public static async Task VerifyCodeFixAsync(string source, DiagnosticResult expected, string fixedSource)
+    public static async Task VerifyCodeFixAsync([StringSyntax("C#-test")] string source, DiagnosticResult expected, string fixedSource)
         => await VerifyCodeFixAsync(source, new[] { expected }, fixedSource);
 
     /// <inheritdoc cref="CodeFixVerifier{TAnalyzer, TCodeFix, TTest, TVerifier}.VerifyCodeFixAsync(string, DiagnosticResult[], string)"/>
-    public static async Task VerifyCodeFixAsync(string source, DiagnosticResult[] expected, string fixedSource, int? expectedIterations = null, string usageSource = null, string codeActionEquivalenceKey = null)
+    public static async Task VerifyCodeFixAsync([StringSyntax("C#-test")] string source, DiagnosticResult[] expected, string fixedSource, int? expectedIterations = null, string usageSource = null, string codeActionEquivalenceKey = null)
     {
         var test = new CSharpCodeFixTest<TAnalyzer, TCodeFix, DefaultVerifier>
         {
diff --git a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpSourceGeneratorVerifier.cs b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpSourceGeneratorVerifier.cs
index 13286b98f26f..f4d70de67467 100644
--- a/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpSourceGeneratorVerifier.cs
+++ b/src/Framework/AspNetCoreAnalyzers/test/Verifiers/CSharpSourceGeneratorVerifier.cs
@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics.CodeAnalysis;
 using System.Text;
 using Microsoft.AspNetCore.Analyzers.WebApplicationBuilder;
 using Microsoft.CodeAnalysis;
@@ -13,7 +14,7 @@ namespace Microsoft.AspNetCore.Analyzers.Verifiers;
 public static partial class CSharpSourceGeneratorVerifier<TSourceGenerator>
         where TSourceGenerator : IIncrementalGenerator, new()
 {
-    public static async Task VerifyAsync(string source, string generatedFileName, string generatedSource)
+    public static async Task VerifyAsync([StringSyntax("C#-test")] string source, string generatedFileName, string generatedSource)
     {
         var test = new CSharpSourceGeneratorTest<TSourceGenerator, DefaultVerifier>
         {
@@ -31,7 +32,7 @@ public static async Task VerifyAsync(string source, string generatedFileName, st
         await test.RunAsync(CancellationToken.None);
     }
 
-    public static async Task VerifyAsync(string source)
+    public static async Task VerifyAsync([StringSyntax("C#-test")] string source)
     {
         var test = new CSharpSourceGeneratorTest<TSourceGenerator, DefaultVerifier>
         {