Expand unit tests for ChatGPTTelegramInferenceBot and AnthropicTelegramInferenceBot

- Added test cases for get_chat_response method in both classes.
- Added test cases for handle_message method in both classes.
- Added test cases for switch_model method in ChatGPTTelegramInferenceBot.

tests/claude/test_anthropic_telegram_inference_bot.py

@@ -0,0 +1,33 @@
+import unittest
+from unittest.mock import patch, MagicMock
+from anthropic_telegram_inference_bot import AnthropicTelegramInferenceBot
+
+class TestAnthropicTelegramInferenceBot(unittest.TestCase):
+    def setUp(self):
+        self.bot = AnthropicTelegramInferenceBot()
+    
+    @patch('anthropic_telegram_inference_bot.Anthropic')
+    def test_get_chat_response(self, MockAnthropic):
+        mock_anthropic = MockAnthropic.return_value
+        mock_anthropic.messages.create.return_value = MagicMock()
+
+        messages = [{"role": "user", "content": "Hello"}]
+        response = self.bot.get_chat_response(messages)
+        
+        self.assertIsNotNone(response)
+    
+    @patch('anthropic_telegram_inference_bot.Anthropic')
+    def test_handle_message(self, MockAnthropic):
+        mock_anthropic = MockAnthropic.return_value
+        mock_anthropic.messages.create.return_value = MagicMock(content=[MagicMock(type="message", text="response content")])
+        
+        user_id = "user123"
+        user_message = "Hello"
+        response = self.bot.handle_message(user_id, user_message)
+        
+        self.assertIsNotNone(response)
+    
+    # Additional testing for error cases and edge cases
+
+if __name__ == '__main__':
+    unittest.main()