Add null check in VSTestConsoleLocator.GetTestPlatformVersion

Co-authored-by: Youssef1313 <[email protected]>

test/Utilities/Automation.CLI/VSTestConsoleLocator.cs

@@ -43,7 +43,7 @@
 
     private static string GetNugetPackageFolder()
     {
         string nugetPackagesFolderPath = Environment.GetEnvironmentVariable("NUGET_PACKAGES");
         if (!string.IsNullOrEmpty(nugetPackagesFolderPath))
         {
             Assert.IsTrue(Directory.Exists(nugetPackagesFolderPath), $"Found environment variable 'NUGET_PACKAGES' and NuGet package folder '{nugetPackagesFolderPath}' should exist");
@@ -51,8 +51,8 @@
             return nugetPackagesFolderPath;
         }
 
         string userProfile = Environment.GetEnvironmentVariable("USERPROFILE");
         nugetPackagesFolderPath = Path.Combine(userProfile, ".nuget", "packages");
         Assert.IsTrue(Directory.Exists(nugetPackagesFolderPath), $"NuGet package folder '{nugetPackagesFolderPath}' should exist");
 
         return nugetPackagesFolderPath;
@@ -68,7 +68,11 @@
         var cpmXml = new XmlDocument();
         cpmXml.Load(xmlTextReader);
 
-        XmlNode testSdkVersion = cpmXml.DocumentElement.SelectSingleNode("PropertyGroup/MicrosoftNETTestSdkVersion");
+        XmlNode? testSdkVersion = cpmXml.DocumentElement?.SelectSingleNode("PropertyGroup/MicrosoftNETTestSdkVersion");
+        if (testSdkVersion is null)
+        {
+            throw new InvalidOperationException($"Could not find MicrosoftNETTestSdkVersion in {cpmFilePath}");
+        }
 
         return testSdkVersion.InnerText;
     }