[Storage] Run only last SV in live tests. (Azure#16826)

Author: kasobol-msft

sdk/core/Azure.Core.TestFramework/src/ClientTestFixtureAttribute.cs

@@ -15,6 +15,13 @@ public class ClientTestFixtureAttribute : NUnitAttribute, IFixtureBuilder2, IPre
     {
         public static readonly string SyncOnlyKey = "SyncOnly";
         public static readonly string RecordingDirectorySuffixKey = "RecordingDirectory";
+        public static readonly string OnlyTestLatestServiceVersionKey = "AZURE_ONLY_TEST_LATEST_SERVICE_VERSION";
+
+        private static readonly Lazy<bool> OnlyTestLatestServiceVersionLazy = new Lazy<bool>(() =>
+        {
+            bool.TryParse(Environment.GetEnvironmentVariable(OnlyTestLatestServiceVersionKey), out bool onlyTestLatestServiceVersion);
+            return onlyTestLatestServiceVersion;
+        });
 
         private readonly object[] _additionalParameters;
         private readonly object[] _serviceVersions;
@@ -156,6 +163,13 @@ private void ProcessTest(object serviceVersion, bool isAsync, int serviceVersion
                 test.Properties.Add("SkipRecordings", $"Test is ignored when not running live because the service version {serviceVersion} is not the latest.");
             }
 
+            if (OnlyTestLatestServiceVersionLazy.Value && serviceVersionNumber != _maxServiceVersion)
+            {
+                test.RunState = RunState.Ignored;
+                test.Properties.Set("_SKIPREASON",
+                    $"Test ignored because {OnlyTestLatestServiceVersionKey} is set in the environment and version {serviceVersion} is not the latest.");
+            }
+
             var minServiceVersion = test.GetCustomAttributes<ServiceVersionAttribute>(true);
             foreach (ServiceVersionAttribute serviceVersionAttribute in minServiceVersion)
             {

sdk/storage/tests.yml

@@ -10,3 +10,5 @@ extends:
     SubscriptionConfiguration: $(sub-config-azure-cloud-test-resources-preview)
     TestSetupSteps:
     - template: /sdk/storage/tests-install-azurite.yml
+    EnvVars:
+      AZURE_ONLY_TEST_LATEST_SERVICE_VERSION: true