Storage/Datalake test improvement (Azure#4884)

* Update sas test

* add test case and test records

* fix import file

* fix import files

* update record

* fix test name

* fix conversations

* update test

* fix clang format

Author: microzchang

sdk/storage/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "cpp",
   "TagPrefix": "cpp/storage",
-  "Tag": "cpp/storage_366c2de93d"
+  "Tag": "cpp/storage_34b082e038"
 }

sdk/storage/azure-storage-files-datalake/test/ut/datalake_directory_client_test.cpp

@@ -163,6 +163,16 @@ namespace Azure { namespace Storage { namespace Test {
       EXPECT_NO_THROW(deleted = dirClient.DeleteEmptyIfExists().Value.Deleted);
       EXPECT_FALSE(deleted);
     }
+    {
+      // Recursive delete if exists
+      auto rootDir = baseName + "root";
+      auto rootDirClient = m_fileSystemClient->GetDirectoryClient(rootDir);
+      EXPECT_NO_THROW(rootDirClient.Create());
+      auto fileClient = rootDirClient.GetFileClient(RandomString());
+      EXPECT_NO_THROW(fileClient.Create());
+      EXPECT_THROW(rootDirClient.DeleteEmpty(), StorageException);
+      EXPECT_NO_THROW(rootDirClient.DeleteRecursiveIfExists());
+    }
   }
 
   TEST_F(DataLakeDirectoryClientTest, RenameFile)