sprints and audit work

src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Channels/EmailChannelAdapter.cs

@@ -18,18 +18,21 @@ public sealed class EmailChannelAdapter : IChannelAdapter, IDisposable
     private readonly ChannelAdapterOptions _options;
     private readonly ILogger<EmailChannelAdapter> _logger;
     private readonly TimeProvider _timeProvider;
+    private readonly Func<double> _jitterSource;
     private bool _disposed;
 
     public EmailChannelAdapter(
         INotifyAuditRepository auditRepository,
         IOptions<ChannelAdapterOptions> options,
         TimeProvider timeProvider,
-        ILogger<EmailChannelAdapter> logger)
+        ILogger<EmailChannelAdapter> logger,
+        Func<double>? jitterSource = null)
     {
         _auditRepository = auditRepository ?? throw new ArgumentNullException(nameof(auditRepository));
         _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
         _timeProvider = timeProvider ?? TimeProvider.System;
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _jitterSource = jitterSource ?? Random.Shared.NextDouble;
     }
 
     public NotifyChannelType ChannelType => NotifyChannelType.Email;
@@ -298,7 +301,7 @@ public sealed class EmailChannelAdapter : IChannelAdapter, IDisposable
     {
         var baseDelay = _options.RetryBaseDelay;
         var maxDelay = _options.RetryMaxDelay;
-        var jitter = Random.Shared.NextDouble() * 0.3 + 0.85;
+        var jitter = _jitterSource() * 0.3 + 0.85;
         var delay = TimeSpan.FromMilliseconds(baseDelay.TotalMilliseconds * Math.Pow(2, attempt - 1) * jitter);
         return delay > maxDelay ? maxDelay : delay;
     }