Fix analyzer messages not localized

eng/verify-nupkgs.ps1

@@ -24,7 +24,7 @@ function Confirm-NugetPackages {
         "MSTest.TestFramework"                  = 148;
         "MSTest.TestAdapter"                    = 74;
         "MSTest"                                = 6;
-        "MSTest.Analyzers"                      = 10;
+        "MSTest.Analyzers"                      = 50;
     }
 
     $packageDirectory = Resolve-Path "$PSScriptRoot/../artifacts/packages/$configuration"

src/Analyzers/MSTest.Analyzers.Package/MSTest.Analyzers.Package.csproj

@@ -34,10 +34,14 @@
 
   <Target Name="_AddAnalyzersToOutput">
     <ItemGroup>
-      <!-- Analyzer works for both C# and VB.NET -->
-      <TfmSpecificPackageFile Include="$(OutputPath)\MSTest.Analyzers.dll" PackagePath="analyzers/dotnet" />
-      <!-- This code fix is C# specific -->
+      <TfmSpecificPackageFile Include="$(OutputPath)\MSTest.Analyzers.dll" PackagePath="analyzers/dotnet/cs" />
       <TfmSpecificPackageFile Include="$(OutputPath)\MSTest.Analyzers.CodeFixes.dll" PackagePath="analyzers/dotnet/cs" />
+      <TfmSpecificPackageFile Include="$(OutputPath)\**\MSTest.Analyzers.resources.dll" PackagePath="analyzers/dotnet/cs/" />
+      <TfmSpecificPackageFile Include="$(OutputPath)\**\MSTest.Analyzers.CodeFixes.resources.dll" PackagePath="analyzers/dotnet/cs/" />
+
+      <!-- NOTE: Currently, code fixes are C# only. -->
+      <TfmSpecificPackageFile Include="$(OutputPath)\MSTest.Analyzers.dll" PackagePath="analyzers/dotnet/vb" />
+      <TfmSpecificPackageFile Include="$(OutputPath)\**\MSTest.Analyzers.resources.dll" PackagePath="analyzers/dotnet/vb/" />
     </ItemGroup>
   </Target>
 

test/IntegrationTests/MSTest.Acceptance.IntegrationTests/AnalyzersTests.cs

@@ -0,0 +1,63 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Testing.Platform.Acceptance.IntegrationTests;
+using Microsoft.Testing.Platform.Acceptance.IntegrationTests.Helpers;
+
+namespace MSTest.Acceptance.IntegrationTests;
+
+[TestClass]
+public sealed class AnalyzersTests : AcceptanceTestBase<AnalyzersTests.TestAssetFixture>
+{
+    [TestMethod]
+    public async Task AnalyzerMessagesShouldBeLocalized()
+    {
+        var testHost = TestHost.LocateFrom(AssetFixture.ProjectPath, TestAssetFixture.ProjectName, TargetFrameworks.NetCurrent);
+        TestHostResult testHostResult = await testHost.ExecuteAsync(environmentVariables: new()
+        {
+            // This is fr-FR
+            ["VSLang"] = "1036",
+        });
+
+        testHostResult.AssertOutputContains("DataRow ne doit être défini que sur une méthode de test");
+    }
+
+    public sealed class TestAssetFixture() : TestAssetFixtureBase(AcceptanceFixture.NuGetGlobalPackagesFolder)
+    {
+        public const string ProjectName = "Analyzers";
+
+        public string ProjectPath => GetAssetPath(ProjectName);
+
+        public override IEnumerable<(string ID, string Name, string Code)> GetAssetsToGenerate()
+        {
+            yield return (ProjectName, ProjectName,
+                SourceCode
+                .PatchTargetFrameworks(TargetFrameworks.NetCurrent)
+                .PatchCodeWithReplace("$MSTestVersion$", MSTestVersion));
+        }
+
+        private const string SourceCode = """
+#file Analyzers.csproj
+<Project Sdk="MSTest.Sdk/$MSTestVersion$">
+
+  <PropertyGroup>
+    <TargetFrameworks>$TargetFrameworks$</TargetFrameworks>
+  </PropertyGroup>
+
+</Project>
+
+#file UnitTest1.cs
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+[TestClass]
+public class UnitTest1
+{
+    [DataRow(0)]
+    public void TestMethod()
+    {
+    }
+}
+""";
+    }
+}