add tests

ChatBot/Services/ChatService.cs

@@ -55,7 +55,7 @@ namespace ChatBot.Services
         /// <summary>
         /// Process a user message and get AI response
         /// </summary>
-        public async Task<string> ProcessMessageAsync(
+        public virtual async Task<string> ProcessMessageAsync(
             long chatId,
             string username,
             string message,
@@ -192,7 +192,7 @@ namespace ChatBot.Services
         /// <summary>
         /// Get session information
         /// </summary>
-        public ChatSession? GetSession(long chatId)
+        public virtual ChatSession? GetSession(long chatId)
         {
             return _sessionStorage.Get(chatId);
         }

ChatBot/Services/DatabaseSessionStorage.cs

@@ -178,7 +178,14 @@ namespace ChatBot.Services
             // Add messages to session
             foreach (var messageEntity in entity.Messages.OrderBy(m => m.MessageOrder))
             {
-                var role = Enum.Parse<ChatRole>(messageEntity.Role);
+                var role = messageEntity.Role.ToLowerInvariant() switch
+                {
+                    "user" => ChatRole.User,
+                    "assistant" => ChatRole.Assistant,
+                    "system" => ChatRole.System,
+                    "tool" => ChatRole.Tool,
+                    _ => throw new ArgumentException($"Unknown role: {messageEntity.Role}")
+                };
                 var message = new ChatMessage { Content = messageEntity.Content, Role = role };
                 session.AddMessage(message);
             }

ChatBot/Services/Telegram/Services/BotInfoService.cs

@@ -24,7 +24,7 @@ namespace ChatBot.Services.Telegram.Services
         /// <summary>
         /// Получает информацию о боте (с кэшированием и автоматической инвалидацией)
         /// </summary>
-        public async Task<User?> GetBotInfoAsync(CancellationToken cancellationToken = default)
+        public virtual async Task<User?> GetBotInfoAsync(CancellationToken cancellationToken = default)
         {
             // Проверяем, есть ли валидный кэш
             if (

ChatBot/Services/Telegram/Services/TelegramMessageSenderWrapper.cs

@@ -23,10 +23,16 @@ namespace ChatBot.Services.Telegram.Services
             CancellationToken cancellationToken = default
         )
         {
+            ReplyParameters? replyParameters = null;
+            if (replyToMessageId > 0)
+            {
+                replyParameters = new ReplyParameters { MessageId = replyToMessageId };
+            }
+
             return await _botClient.SendMessage(
                 chatId: chatId,
                 text: text,
-                replyParameters: replyToMessageId,
+                replyParameters: replyParameters,
                 cancellationToken: cancellationToken
             );
         }