diff --git a/3 - PB/MVP/src/backend/application/service/change_configuration_service.py b/3 - PB/MVP/src/backend/application/service/change_configuration_service.py
index 332056a6..714695b6 100644
--- a/3 - PB/MVP/src/backend/application/service/change_configuration_service.py	
+++ b/3 - PB/MVP/src/backend/application/service/change_configuration_service.py	
@@ -8,5 +8,4 @@ def __init__(self, changeConfigurationPort: ChangeConfigurationPort):
         self.outport = changeConfigurationPort
            
     def changeLLMModel(self, LLModel:LLMModelType ) -> ConfigurationOperationResponse:
-        return self.outport.changeLLMModel(LLModel)
-    
+        return self.outport.changeLLMModel(LLModel)
\ No newline at end of file
diff --git a/3 - PB/MVP/tests/backend/application/service/change_configuration_service_test.py b/3 - PB/MVP/tests/backend/application/service/change_configuration_service_test.py
new file mode 100644
index 00000000..405542d3
--- /dev/null
+++ b/3 - PB/MVP/tests/backend/application/service/change_configuration_service_test.py	
@@ -0,0 +1,20 @@
+import unittest.mock
+from application.service.change_configuration_service import ChangeConfigurationService
+from domain.configuration.llm_model_configuration import LLMModelType
+from domain.configuration.configuration_operation_response import ConfigurationOperationResponse
+
+def test_changeConfiguration():
+    with unittest.mock.patch('application.service.change_configuration_service.ChangeConfigurationPort') as changeConfigurationPortMock:
+        changeConfigurationPortMock.changeLLMModel.return_value = ConfigurationOperationResponse(True, "Model changed successfully")
+    # outPortMock = mocker.Mock()
+    # outPortMock.changeLLMModel.return_value = ConfigurationOperationResponse(True, "Model changed successfully")
+    
+    # changeConfigurationService = ChangeConfigurationService(outPortMock)
+        changeConfigurationService = ChangeConfigurationService(changeConfigurationPortMock)
+    
+        response = changeConfigurationService.changeLLMModel(LLMModelType.OPENAI)
+        
+        # outPortMock.changeLLMModel.assert_called_once_with(LLMModelType.OPENAI)
+        changeConfigurationPortMock.changeLLMModel.assert_called_once_with(LLMModelType.OPENAI)
+        
+        assert isinstance(response, ConfigurationOperationResponse)
\ No newline at end of file