Highest version filtering for extensions.

src/Microsoft.TestPlatform.CoreUtilities/Helpers/FileHelper.cs

@@ -5,6 +5,7 @@ namespace Microsoft.VisualStudio.TestPlatform.Utilities.Helpers
 {
     using System;
     using System.Collections.Generic;
+    using System.Diagnostics;
     using System.IO;
     using System.Linq;
 
@@ -15,6 +16,8 @@ namespace Microsoft.VisualStudio.TestPlatform.Utilities.Helpers
     /// </summary>
     public class FileHelper : IFileHelper
     {
+        private static readonly Version DefaultFileVersion = new Version(0, 0);
+
         /// <inheritdoc/>
         public DirectoryInfo CreateDirectory(string path)
         {
@@ -69,6 +72,13 @@ public FileAttributes GetFileAttributes(string path)
             return new FileInfo(path).Attributes;
         }
 
+        /// <inheritdoc/>
+        public Version GetFileVersion(string path)
+        {
+            var currentFileVersion = FileVersionInfo.GetVersionInfo(path)?.FileVersion;
+            return Version.TryParse(currentFileVersion, out var currentVersion) ? currentVersion : DefaultFileVersion;
+        }
+
         /// <inheritdoc/>
         public void CopyFile(string sourcePath, string destinationPath)
         {

src/Microsoft.TestPlatform.CoreUtilities/Helpers/Interfaces/IFileHelper.cs

@@ -3,7 +3,9 @@
 
 namespace Microsoft.VisualStudio.TestPlatform.Utilities.Helpers.Interfaces
 {
+    using System;
     using System.Collections.Generic;
+    using System.Diagnostics;
     using System.IO;
 
     /// <summary>
@@ -63,6 +65,13 @@ public interface IFileHelper
         /// <returns>Attributes of the file.</returns>
         FileAttributes GetFileAttributes(string path);
 
+        /// <summary>
+        /// Gets the version information of the file.
+        /// </summary>
+        /// <param name="path">Full path to the file.</param>
+        /// <returns>File Version information of the file.</returns>
+        Version GetFileVersion(string path);
+
         /// <summary>
         /// Copy a file in the file system.
         /// </summary>

src/Microsoft.TestPlatform.CoreUtilities/Microsoft.TestPlatform.CoreUtilities.csproj

@@ -9,7 +9,7 @@
     <TargetFrameworks>netstandard1.4;net451</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
-    <EmbeddedResource Include="Resources\Resources.resx"/>
+    <EmbeddedResource Include="Resources\Resources.resx" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
     <PackageReference Include="Microsoft.Internal.Dia.Interop">
@@ -19,6 +19,11 @@
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.4' ">
+    <PackageReference Include="System.Diagnostics.FileVersionInfo">
+      <Version>4.3.0</Version>
+    </PackageReference>
+  </ItemGroup>
   <ItemGroup>
     <Compile Update="Resources\Resources.Designer.cs">
       <DesignTime>True</DesignTime>

src/Microsoft.TestPlatform.TestHostProvider/Hosting/DefaultTestHostManager.cs

@@ -6,14 +6,15 @@ namespace Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting
     using System;
     using System.Collections.Generic;
     using System.Diagnostics;
+    using System.Globalization;
     using System.IO;
     using System.Linq;
     using System.Reflection;
     using System.Text;
     using System.Threading;
     using System.Threading.Tasks;
-
     using Microsoft.TestPlatform.TestHostProvider.Hosting;
+    using Microsoft.TestPlatform.TestHostProvider.Resources;
     using Microsoft.VisualStudio.TestPlatform.CoreUtilities.Extensions;
     using Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Helpers;
     using Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Helpers.Interfaces;
@@ -188,6 +189,8 @@ public IEnumerable<string> GetTestPlatformExtensions(IEnumerable<string> sources
                 extensions = extensions.Concat(sources.SelectMany(s => this.fileHelper.EnumerateFiles(Path.GetDirectoryName(s), SearchOption.TopDirectoryOnly, TestAdapterEndsWithPattern)));
             }
 
+            extensions = this.FilterExtensionsBasedOnVersion(extensions);
+
             return extensions;
         }
 
@@ -244,6 +247,78 @@ public Task CleanTestHostAsync(CancellationToken cancellationToken)
             return Task.FromResult(true);
         }
 
+        /// <summary>
+        /// Filter duplicate extensions, include only the highest versioned extension
+        /// </summary>
+        /// <param name="extensions">Entire list of extensions</param>
+        /// <returns>Filtered list of extensions</returns>
+        private IEnumerable<string> FilterExtensionsBasedOnVersion(IEnumerable<string> extensions)
+        {
+            Dictionary<string, string> selectedExtensions = new Dictionary<string, string>();
+            Dictionary<string, Version> highestFileVersions = new Dictionary<string, Version>();
+            Dictionary<string, Version> conflictingExtensions = new Dictionary<string, Version>();
+
+            foreach (var extensionFullPath in extensions)
+            {
+                // assemblyName is the key
+                var extensionAssemblyName = Path.GetFileNameWithoutExtension(extensionFullPath);
+
+                if (selectedExtensions.TryGetValue(extensionAssemblyName, out var oldExtensionPath))
+                {
+                    // This extension is duplicate
+                    var currentVersion = this.GetAndLogFileVersion(extensionFullPath);
+
+                    var oldVersionFound = highestFileVersions.TryGetValue(extensionAssemblyName, out var oldVersion);
+                    if (!oldVersionFound)
+                    {
+                        oldVersion = this.GetAndLogFileVersion(oldExtensionPath);
+                    }
+
+                    // If the version of current file is higher than the one in the map
+                    // replace the older with the current file
+                    if (currentVersion > oldVersion)
+                    {
+                        highestFileVersions[extensionAssemblyName] = currentVersion;
+                        conflictingExtensions[extensionAssemblyName] = currentVersion;
+                        selectedExtensions[extensionAssemblyName] = extensionFullPath;
+                    }
+                    else
+                    {
+                        if (currentVersion < oldVersion)
+                        {
+                            conflictingExtensions[extensionAssemblyName] = oldVersion;
+                        }
+
+                        if (!oldVersionFound)
+                        {
+                            highestFileVersions.Add(extensionAssemblyName, oldVersion);
+                        }
+                    }
+                }
+                else
+                {
+                    selectedExtensions.Add(extensionAssemblyName, extensionFullPath);
+                }
+            }
+
+            // Log warning if conflicting version extensions are found
+            if (conflictingExtensions.Any())
+            {
+                var extensionsString = string.Join("\n", conflictingExtensions.Select(kv => string.Format("  {0} : {1}", kv.Key, kv.Value)));
+                string message = string.Format(CultureInfo.CurrentCulture, Resources.MultipleFileVersions, extensionsString);
+                this.messageLogger.SendMessage(TestMessageLevel.Warning, message);
+            }
+
+            return selectedExtensions.Values;
+        }
+
+        private Version GetAndLogFileVersion(string path)
+        {
+            var fileVersion = this.fileHelper.GetFileVersion(path);
+            EqtTrace.Verbose("FileVersion for {0} : {1}", path, fileVersion);
+            return fileVersion;
+        }
+
         /// <summary>
         /// Raises HostLaunched event
         /// </summary>

src/Microsoft.TestPlatform.TestHostProvider/Hosting/DotnetTestHostManager.cs

@@ -6,12 +6,12 @@ namespace Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting
     using System;
     using System.Collections.Generic;
     using System.Diagnostics;
+    using System.Globalization;
     using System.IO;
     using System.Linq;
     using System.Text;
     using System.Threading;
     using System.Threading.Tasks;
-
     using Microsoft.Extensions.DependencyModel;
     using Microsoft.TestPlatform.TestHostProvider.Hosting;
     using Microsoft.TestPlatform.TestHostProvider.Resources;
@@ -28,7 +28,6 @@ namespace Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Hosting
     using Microsoft.VisualStudio.TestPlatform.Utilities;
     using Microsoft.VisualStudio.TestPlatform.Utilities.Helpers;
     using Microsoft.VisualStudio.TestPlatform.Utilities.Helpers.Interfaces;
-
     using Newtonsoft.Json;
     using Newtonsoft.Json.Linq;
 
@@ -227,7 +226,7 @@ public virtual TestProcessStartInfo GetTestHostProcessStartInfo(
             }
             else
             {
-                string message = string.Format(Resources.NoTestHostFileExist, sourcePath);
+                string message = string.Format(CultureInfo.CurrentCulture, Resources.NoTestHostFileExist, sourcePath);
                 EqtTrace.Verbose("DotnetTestHostmanager: " + message);
                 throw new FileNotFoundException(message);
             }

src/Microsoft.TestPlatform.TestHostProvider/Resources/Resources.resx

@@ -117,6 +117,10 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="MultipleFileVersions" xml:space="preserve">
+    <value>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</value>
+  </data>
   <data name="NoTestHostFileExist" xml:space="preserve">
     <value>No test is available in {0}. Make sure test project has a nuget reference of package "Microsoft.NET.Test.Sdk" and framework version settings are appropriate and try again.</value>
   </data>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.cs.xlf

@@ -7,6 +7,13 @@
         <target state="translated">V {0} není k dispozici žádný test. Ověřte, jestli má testovací projekt odkaz na balíček nuget Microsoft.NET.Test.Sdk a jestli je nastavení verze rozhraní správné. Pak to zkuste znovu.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.de.xlf

@@ -7,6 +7,13 @@
         <target state="translated">In {0} ist kein Test verfügbar. Stellen Sie sicher, dass das Testprojekt über einen NuGet-Verweis des Pakets "Microsoft.NET.Test.Sdk" verfügt und die Einstellungen für die Frameworkversion korrekt sind, und versuchen Sie es anschließend noch mal.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.es.xlf

@@ -7,6 +7,13 @@
         <target state="translated">No hay pruebas disponibles en {0}. Asegúrese de que el proyecto tiene una referencia NuGet del paquete "Microsoft.NET.Test.Sdk" y de que la configuración de la versión del marco es correcta e inténtelo de nuevo.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.fr.xlf

@@ -7,6 +7,13 @@
         <target state="translated">Aucun test n'est disponible dans {0}. Vérifiez que le projet de test a une référence NuGet de package "Microsoft.NET.Test.Sdk" et que les paramètres de version du framework sont corrects, puis réessayez.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.it.xlf

@@ -7,6 +7,13 @@
         <target state="translated">Non ci sono test disponibili in {0}. Assicurarsi che il progetto di test contenga un riferimento NuGet del pacchetto "Microsoft.NET.Test.Sdk" e che le impostazioni relative alla versione del framework siano appropriate, quindi riprovare.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.ja.xlf

@@ -7,6 +7,13 @@
         <target state="translated">{0} で使用できるテストはありません。テスト プロジェクトにパッケージ "Microsoft.NET.Test.Sdk" の NuGet 参照があることを確認し、フレームワークのバージョン設定が適切であることを確認して、もう一度お試しください。</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.ko.xlf

@@ -7,6 +7,13 @@
         <target state="translated">{0}에서 테스트를 사용할 수 없습니다. 테스트 프로젝트에 “Microsoft.NET.Test.Sdk” 패키지의 nuget 참조가 있고 프레임워크 버전 설정이 적절한지 확인한 후 다시 시도하세요.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.pl.xlf

@@ -7,6 +7,13 @@
         <target state="translated">W elemencie {0} nie są dostępne żadne testy. Upewnij się, że projekt testowy ma odwołanie nuget do pakietu „Microsoft.NET.Test.Sdk” oraz że ustawienia wersji platformy i struktury są odpowiednie, a następnie spróbuj ponownie.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.pt-BR.xlf

@@ -7,6 +7,13 @@
         <target state="translated">Nenhum teste disponível em {0}. Verifique se o projeto de teste tem uma referência NuGet do pacote "Microsoft.NET.Test.Sdk" e se as configurações de versão da estrutura são apropriadas e tente novamente.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.TestHostProvider/Resources/xlf/Resources.ru.xlf

@@ -7,6 +7,13 @@
         <target state="translated">Нет доступных тестов в {0}. Убедитесь, что в проекте теста есть ссылка NuGet для пакета "Microsoft.NET.Test.Sdk", а параметры версий платформ верны, и повторите попытку.</target>
         <note />
       </trans-unit>
+      <trans-unit id="MultipleFileVersions">
+        <source>Multiple extensions with different file versions found. Selected extensions with version:
+{0}</source>
+        <target state="new">Multiple extensions with different file versions found. Selected extensions with version:
+{0}</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>