Use random key for storage account in unit test

test/Common/CustomTestStorageAccountProvider.cs

@@ -1,25 +1,33 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
+using System;
 using DurableTask.AzureStorage;
 using Microsoft.WindowsAzure.Storage;
 
 namespace Microsoft.Azure.WebJobs.Extensions.DurableTask.Tests
 {
     internal class CustomTestStorageAccountProvider : IStorageAccountProvider
     {
-        private const string CustomConnectionString = "DefaultEndpointsProtocol=https;AccountName=test;AccountKey=dGVzdA==;EndpointSuffix=core.windows.net";
+        private readonly string customConnectionString;
         private readonly string customConnectionName;
 
         public CustomTestStorageAccountProvider(string connectionName)
         {
             this.customConnectionName = connectionName;
+            this.customConnectionString = $"DefaultEndpointsProtocol=https;AccountName=test;AccountKey={GenerateRandomKey()};EndpointSuffix=core.windows.net";
         }
 
         public CloudStorageAccount GetCloudStorageAccount(string name) =>
-            CloudStorageAccount.Parse(name != this.customConnectionName ? TestHelpers.GetStorageConnectionString() : CustomConnectionString);
+            CloudStorageAccount.Parse(name != this.customConnectionName ? TestHelpers.GetStorageConnectionString() : this.customConnectionString);
 
         public StorageAccountDetails GetStorageAccountDetails(string name) =>
-            new StorageAccountDetails { ConnectionString = name != this.customConnectionName ? TestHelpers.GetStorageConnectionString() : CustomConnectionString };
+            new StorageAccountDetails { ConnectionString = name != this.customConnectionName ? TestHelpers.GetStorageConnectionString() : this.customConnectionString };
+
+        private static string GenerateRandomKey()
+        {
+            string key = Guid.NewGuid().ToString();
+            return Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(key));
+        }
     }
 }